org.rocksdb

Class Transaction

java.lang.Object

org.rocksdb.AbstractNativeReference

org.rocksdb.AbstractImmutableNativeReference

org.rocksdb.RocksObject

org.rocksdb.Transaction

All Implemented Interfaces:

java.lang.AutoCloseable

public class Transaction
extends RocksObject

Provides BEGIN/COMMIT/ROLLBACK transactions. To use transactions, you must first create either an OptimisticTransactionDB or a TransactionDB To create a transaction, use OptimisticTransactionDB.beginTransaction(org.rocksdb.WriteOptions) or TransactionDB.beginTransaction(org.rocksdb.WriteOptions) It is up to the caller to synchronize access to this object. See samples/src/main/java/OptimisticTransactionSample.java and samples/src/main/java/TransactionSample.java for some simple examples.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Transaction.TransactionState
static class	Transaction.WaitingTransactions

Field Summary

Fields inherited from class org.rocksdb.RocksObject

nativeHandle_

Fields inherited from class org.rocksdb.AbstractImmutableNativeReference

owningHandle_

Method Summary

Methods

Modifier and Type	Method and Description
void	clearSnapshot() Clears the current snapshot (i.e.
void	commit() Write all batched keys to the db atomically.
void	delete(byte[] key) Similar to RocksDB.delete(byte[]), but will also perform conflict checking on the keys be written.
void	delete(byte[][] keyParts) Similar to delete(byte[]) but allows you to specify key the in several parts that will be concatenated together.
void	delete(ColumnFamilyHandle columnFamilyHandle, byte[] key) Similar to delete(ColumnFamilyHandle, byte[], boolean) but with assumeTracked = false.
void	delete(ColumnFamilyHandle columnFamilyHandle, byte[][] keyParts) Similar todelete(ColumnFamilyHandle, byte[][], boolean) but with assumeTracked = false.
void	delete(ColumnFamilyHandle columnFamilyHandle, byte[][] keyParts, boolean assumeTracked) Similar to delete(ColumnFamilyHandle, byte[]) but allows you to specify the key in several parts that will be concatenated together.
void	delete(ColumnFamilyHandle columnFamilyHandle, byte[] key, boolean assumeTracked) Similar to RocksDB.delete(ColumnFamilyHandle, byte[]), but will also perform conflict checking on the keys be written.
void	deleteUntracked(byte[] key) Similar to RocksDB.delete(byte[]), but operates on the transactions write batch.
void	deleteUntracked(byte[][] keyParts) Similar to deleteUntracked(byte[]) but allows you to specify the key in several parts that will be concatenated together.
void	deleteUntracked(ColumnFamilyHandle columnFamilyHandle, byte[] key) Similar to RocksDB.delete(ColumnFamilyHandle, byte[]), but operates on the transactions write batch.
void	deleteUntracked(ColumnFamilyHandle columnFamilyHandle, byte[][] keyParts) Similar to deleteUntracked(ColumnFamilyHandle, byte[]) but allows you to specify the key in several parts that will be concatenated together.
void	disableIndexing() By default, all put/merge/delete operations will be indexed in the transaction so that get/getForUpdate/getIterator can search for these keys.
protected void	disposeInternal(long handle)
void	enableIndexing() Re-enables indexing after a previous call to disableIndexing()
byte[]	get(ColumnFamilyHandle columnFamilyHandle, ReadOptions readOptions, byte[] key) This function is similar to RocksDB.get(ColumnFamilyHandle, ReadOptions, byte[]) except it will also read pending changes in this transaction.
byte[]	get(ReadOptions readOptions, byte[] key) This function is similar to RocksDB.get(ReadOptions, byte[]) except it will also read pending changes in this transaction.
WriteBatch	getCommitTimeWriteBatch() Get the Commit time Write Batch.
long	getElapsedTime() Returns the elapsed time in milliseconds since this Transaction began.
byte[]	getForUpdate(ReadOptions readOptions, byte[] key, boolean exclusive) Read this key and ensure that this transaction will only be able to be committed if this key is not written outside this transaction after it has first been read (or after the snapshot if a snapshot is set in this transaction).
byte[]	getForUpdate(ReadOptions readOptions, ColumnFamilyHandle columnFamilyHandle, byte[] key, boolean exclusive) Same as getForUpdate(ReadOptions, ColumnFamilyHandle, byte[], boolean, boolean) with doValidate=true.
byte[]	getForUpdate(ReadOptions readOptions, ColumnFamilyHandle columnFamilyHandle, byte[] key, boolean exclusive, boolean doValidate) Read this key and ensure that this transaction will only be able to be committed if this key is not written outside this transaction after it has first been read (or after the snapshot if a snapshot is set in this transaction).
long	getId() The globally unique id with which the transaction is identified.
long	getID() Get the ID of the transaction.
RocksIterator	getIterator(ReadOptions readOptions) Returns an iterator that will iterate on all keys in the default column family including both keys in the DB and uncommitted keys in this transaction.
RocksIterator	getIterator(ReadOptions readOptions, ColumnFamilyHandle columnFamilyHandle) Returns an iterator that will iterate on all keys in the column family specified by columnFamilyHandle including both keys in the DB and uncommitted keys in this transaction.
long	getLogNumber() Get the log number.
java.lang.String	getName() Get the name of the transaction.
long	getNumDeletes() Returns the number of deletes that have been applied to this transaction so far.
long	getNumKeys() Returns the number of distinct Keys being tracked by this transaction.
long	getNumMerges() Returns the number of merges that have been applied to this transaction so far.
long	getNumPuts() Returns the number of puts that have been applied to this transaction so far.
Snapshot	getSnapshot() Returns the Snapshot created by the last call to setSnapshot().
Transaction.TransactionState	getState() Get the execution status of the transaction.
Transaction.WaitingTransactions	getWaitingTxns() Get the list of waiting transactions.
WriteBatchWithIndex	getWriteBatch() Fetch the underlying write batch that contains all pending changes to be committed.
WriteOptions	getWriteOptions() Return the WriteOptions that will be used during commit().
boolean	isDeadlockDetect() Determine if a deadlock has been detected.
void	merge(byte[] key, byte[] value) Similar to RocksDB.merge(byte[], byte[]), but will also perform conflict checking on the keys be written.
void	merge(ColumnFamilyHandle columnFamilyHandle, byte[] key, byte[] value) Similar to merge(ColumnFamilyHandle, byte[], byte[], boolean) but with assumeTracked = false.
void	merge(ColumnFamilyHandle columnFamilyHandle, byte[] key, byte[] value, boolean assumeTracked) Similar to RocksDB.merge(ColumnFamilyHandle, byte[], byte[]), but will also perform conflict checking on the keys be written.
void	mergeUntracked(byte[] key, byte[] value) Similar to RocksDB.merge(byte[], byte[]), but operates on the transactions write batch.
void	mergeUntracked(ColumnFamilyHandle columnFamilyHandle, byte[] key, byte[] value) Similar to RocksDB.merge(ColumnFamilyHandle, byte[], byte[]), but operates on the transactions write batch.
byte[][]	multiGet(ReadOptions readOptions, byte[][] keys) This function is similar to RocksDB.multiGet(ReadOptions, List) except it will also read pending changes in this transaction.
byte[][]	multiGet(ReadOptions readOptions, java.util.List<ColumnFamilyHandle> columnFamilyHandles, byte[][] keys) This function is similar to RocksDB.multiGet(ReadOptions, List, List) except it will also read pending changes in this transaction.
byte[][]	multiGetForUpdate(ReadOptions readOptions, byte[][] keys) A multi-key version of getForUpdate(ReadOptions, byte[], boolean).
byte[][]	multiGetForUpdate(ReadOptions readOptions, java.util.List<ColumnFamilyHandle> columnFamilyHandles, byte[][] keys) A multi-key version of getForUpdate(ReadOptions, ColumnFamilyHandle, byte[], boolean).
void	put(byte[][] keyParts, byte[][] valueParts) Similar to put(byte[], byte[]) but allows you to specify the key and value in several parts that will be concatenated together
void	put(byte[] key, byte[] value) Similar to RocksDB.put(byte[], byte[]), but will also perform conflict checking on the keys be written.
void	put(ColumnFamilyHandle columnFamilyHandle, byte[][] keyParts, byte[][] valueParts) Similar to put(ColumnFamilyHandle, byte[][], byte[][], boolean) but with with assumeTracked = false.
void	put(ColumnFamilyHandle columnFamilyHandle, byte[][] keyParts, byte[][] valueParts, boolean assumeTracked) Similar to put(ColumnFamilyHandle, byte[], byte[]) but allows you to specify the key and value in several parts that will be concatenated together.
void	put(ColumnFamilyHandle columnFamilyHandle, byte[] key, byte[] value) Similar to put(ColumnFamilyHandle, byte[], byte[], boolean) but with assumeTracked = false.
void	put(ColumnFamilyHandle columnFamilyHandle, byte[] key, byte[] value, boolean assumeTracked) Similar to RocksDB.put(ColumnFamilyHandle, byte[], byte[]), but will also perform conflict checking on the keys be written.
void	putLogData(byte[] blob) Similar to AbstractWriteBatch.putLogData(byte[])
void	putUntracked(byte[][] keyParts, byte[][] valueParts) Similar to putUntracked(byte[], byte[]) but allows you to specify the key and value in several parts that will be concatenated together.
void	putUntracked(byte[] key, byte[] value) Similar to RocksDB.put(byte[], byte[]), but operates on the transactions write batch.
void	putUntracked(ColumnFamilyHandle columnFamilyHandle, byte[][] keyParts, byte[][] valueParts) Similar to putUntracked(ColumnFamilyHandle, byte[], byte[]) but allows you to specify the key and value in several parts that will be concatenated together.
void	putUntracked(ColumnFamilyHandle columnFamilyHandle, byte[] key, byte[] value) Similar to RocksDB.put(ColumnFamilyHandle, byte[], byte[]), but operates on the transactions write batch.
void	rebuildFromWriteBatch(WriteBatch writeBatch) Adds the keys from the WriteBatch to the transaction
void	rollback() Discard all batched writes in this transaction.
void	rollbackToSavePoint() Undo all operations in this transaction (put, merge, delete, putLogData) since the most recent call to setSavePoint() and removes the most recent setSavePoint().
void	setLockTimeout(long lockTimeout) Change the value of TransactionOptions.getLockTimeout() (in milliseconds) for this transaction.
void	setLogNumber(long logNumber) Set the log number.
void	setName(java.lang.String transactionName) Set the name of the transaction.
void	setSavePoint() Records the state of the transaction for future calls to rollbackToSavePoint().
void	setSnapshot() If a transaction has a snapshot set, the transaction will ensure that any keys successfully written(or fetched via getForUpdate(org.rocksdb.ReadOptions, org.rocksdb.ColumnFamilyHandle, byte[], boolean, boolean)) have not been modified outside of this transaction since the time the snapshot was set.
void	setSnapshotOnNextOperation() Similar to setSnapshot(), but will not change the current snapshot until put/merge/delete/getForUpdate/multiGetForUpdate is called.
void	setSnapshotOnNextOperation(AbstractTransactionNotifier transactionNotifier) Similar to setSnapshot(), but will not change the current snapshot until put/merge/delete/getForUpdate/multiGetForUpdate is called.
void	setWriteOptions(WriteOptions writeOptions) Reset the WriteOptions that will be used during commit().
void	singleDelete(byte[] key) Similar to RocksDB.singleDelete(byte[]), but will also perform conflict checking on the keys be written.
void	singleDelete(byte[][] keyParts) Similar to singleDelete(byte[]) but allows you to specify the key in several parts that will be concatenated together.
void	singleDelete(ColumnFamilyHandle columnFamilyHandle, byte[] key) Similar to singleDelete(ColumnFamilyHandle, byte[], boolean) but with assumeTracked = false.
void	singleDelete(ColumnFamilyHandle columnFamilyHandle, byte[][] keyParts) Similar tosingleDelete(ColumnFamilyHandle, byte[][], boolean) but with assumeTracked = false.
void	singleDelete(ColumnFamilyHandle columnFamilyHandle, byte[][] keyParts, boolean assumeTracked) Similar to singleDelete(ColumnFamilyHandle, byte[]) but allows you to specify the key in several parts that will be concatenated together.
void	singleDelete(ColumnFamilyHandle columnFamilyHandle, byte[] key, boolean assumeTracked) Similar to RocksDB.singleDelete(ColumnFamilyHandle, byte[]), but will also perform conflict checking on the keys be written.
void	undoGetForUpdate(byte[] key) If this key was previously fetched in this transaction using getForUpdate(ReadOptions, byte[], boolean)/ multiGetForUpdate(ReadOptions, List, byte[][]), calling undoGetForUpdate(byte[]) will tell the transaction that it no longer needs to do any conflict checking for this key.
void	undoGetForUpdate(ColumnFamilyHandle columnFamilyHandle, byte[] key) If this key was previously fetched in this transaction using getForUpdate(ReadOptions, ColumnFamilyHandle, byte[], boolean)/ multiGetForUpdate(ReadOptions, List, byte[][]), calling undoGetForUpdate(ColumnFamilyHandle, byte[]) will tell the transaction that it no longer needs to do any conflict checking for this key.

Methods inherited from class org.rocksdb.RocksObject

disposeInternal, getNativeHandle

Methods inherited from class org.rocksdb.AbstractImmutableNativeReference

close, disOwnNativeHandle, isOwningHandle

Methods inherited from class org.rocksdb.AbstractNativeReference

dispose, finalize

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

setSnapshot

public void setSnapshot()

If a transaction has a snapshot set, the transaction will ensure that any keys successfully written(or fetched via getForUpdate(org.rocksdb.ReadOptions, org.rocksdb.ColumnFamilyHandle, byte[], boolean, boolean)) have not been modified outside of this transaction since the time the snapshot was set. If a snapshot has not been set, the transaction guarantees that keys have not been modified since the time each key was first written (or fetched via getForUpdate(org.rocksdb.ReadOptions, org.rocksdb.ColumnFamilyHandle, byte[], boolean, boolean)). Using setSnapshot() will provide stricter isolation guarantees at the expense of potentially more transaction failures due to conflicts with other writes. Calling setSnapshot() has no effect on keys written before this function has been called. setSnapshot() may be called multiple times if you would like to change the snapshot used for different operations in this transaction. Calling setSnapshot() will not affect the version of Data returned by get(...) methods. See get(org.rocksdb.ColumnFamilyHandle, org.rocksdb.ReadOptions, byte[]) for more details.

setSnapshotOnNextOperation

public void setSnapshotOnNextOperation()

Similar to setSnapshot(), but will not change the current snapshot until put/merge/delete/getForUpdate/multiGetForUpdate is called. By calling this function, the transaction will essentially call setSnapshot() for you right before performing the next write/getForUpdate. Calling setSnapshotOnNextOperation() will not affect what snapshot is returned by getSnapshot() until the next write/getForUpdate is executed. When the snapshot is created the notifier's snapshotCreated method will be called so that the caller can get access to the snapshot. This is an optimization to reduce the likelihood of conflicts that could occur in between the time setSnapshot() is called and the first write/getForUpdate operation. i.e. this prevents the following race-condition: txn1->setSnapshot(); txn2->put("A", ...); txn2->commit(); txn1->getForUpdate(opts, "A", ...); * FAIL!

setSnapshotOnNextOperation

public void setSnapshotOnNextOperation(AbstractTransactionNotifier transactionNotifier)

Similar to setSnapshot(), but will not change the current snapshot until put/merge/delete/getForUpdate/multiGetForUpdate is called. By calling this function, the transaction will essentially call setSnapshot() for you right before performing the next write/getForUpdate. Calling setSnapshotOnNextOperation() will not affect what snapshot is returned by getSnapshot() until the next write/getForUpdate is executed. When the snapshot is created the AbstractTransactionNotifier.snapshotCreated(Snapshot) method will be called so that the caller can get access to the snapshot. This is an optimization to reduce the likelihood of conflicts that could occur in between the time setSnapshot() is called and the first write/getForUpdate operation. i.e. this prevents the following race-condition: txn1->setSnapshot(); txn2->put("A", ...); txn2->commit(); txn1->getForUpdate(opts, "A", ...); * FAIL!

Parameters:

transactionNotifier - A handler for receiving snapshot notifications for the transaction

getSnapshot

public Snapshot getSnapshot()

Returns the Snapshot created by the last call to setSnapshot(). REQUIRED: The returned Snapshot is only valid up until the next time setSnapshot()/setSnapshotOnNextOperation() is called, clearSnapshot() is called, or the Transaction is deleted.

Returns:

The snapshot or null if there is no snapshot

clearSnapshot

public void clearSnapshot()

Clears the current snapshot (i.e. no snapshot will be 'set') This removes any snapshot that currently exists or is set to be created on the next update operation (setSnapshotOnNextOperation()). Calling clearSnapshot() has no effect on keys written before this function has been called. If a reference to a snapshot was retrieved via getSnapshot(), it will no longer be valid and should be discarded after a call to clearSnapshot().

commit

public void commit()
            throws RocksDBException

Write all batched keys to the db atomically. Returns OK on success. May return any error status that could be returned by DB:Write(). If this transaction was created by an OptimisticTransactionDB Status::Busy() may be returned if the transaction could not guarantee that there are no write conflicts. Status::TryAgain() may be returned if the memtable history size is not large enough (See max_write_buffer_number_to_maintain). If this transaction was created by a TransactionDB, Status::Expired() may be returned if this transaction has lived for longer than TransactionOptions.getExpiration().

Throws:

RocksDBException - if an error occurs when committing the transaction

rollback

public void rollback()
              throws RocksDBException

Discard all batched writes in this transaction.

Throws:

RocksDBException - if an error occurs when rolling back the transaction

setSavePoint

public void setSavePoint()
                  throws RocksDBException

Records the state of the transaction for future calls to rollbackToSavePoint(). May be called multiple times to set multiple save points.

Throws:

RocksDBException - if an error occurs whilst setting a save point

rollbackToSavePoint

public void rollbackToSavePoint()
                         throws RocksDBException

Undo all operations in this transaction (put, merge, delete, putLogData) since the most recent call to setSavePoint() and removes the most recent setSavePoint(). If there is no previous call to setSavePoint(), returns Status::NotFound()

Throws:

RocksDBException - if an error occurs when rolling back to a save point

get

public byte[] get(ColumnFamilyHandle columnFamilyHandle,
         ReadOptions readOptions,
         byte[] key)
           throws RocksDBException

This function is similar to RocksDB.get(ColumnFamilyHandle, ReadOptions, byte[]) except it will also read pending changes in this transaction. Currently, this function will return Status::MergeInProgress if the most recent write to the queried key in this batch is a Merge. If ReadOptions.snapshot() is not set, the current version of the key will be read. Calling setSnapshot() does not affect the version of the data returned. Note that setting ReadOptions.setSnapshot(Snapshot) will affect what is read from the DB but will NOT change which keys are read from this transaction (the keys in this transaction do not yet belong to any snapshot and will be fetched regardless).

Parameters:

columnFamilyHandle - ColumnFamilyHandle instance

readOptions - Read options.

key - the key to retrieve the value for.

Returns:

a byte array storing the value associated with the input key if any. null if it does not find the specified key.

Throws:

RocksDBException - thrown if error happens in underlying native library.

get

public byte[] get(ReadOptions readOptions,
         byte[] key)
           throws RocksDBException

This function is similar to RocksDB.get(ReadOptions, byte[]) except it will also read pending changes in this transaction. Currently, this function will return Status::MergeInProgress if the most recent write to the queried key in this batch is a Merge. If ReadOptions.snapshot() is not set, the current version of the key will be read. Calling setSnapshot() does not affect the version of the data returned. Note that setting ReadOptions.setSnapshot(Snapshot) will affect what is read from the DB but will NOT change which keys are read from this transaction (the keys in this transaction do not yet belong to any snapshot and will be fetched regardless).

Parameters:

readOptions - Read options.

key - the key to retrieve the value for.

Returns:

a byte array storing the value associated with the input key if any. null if it does not find the specified key.

Throws:

RocksDBException - thrown if error happens in underlying native library.

multiGet

public byte[][] multiGet(ReadOptions readOptions,
                java.util.List<ColumnFamilyHandle> columnFamilyHandles,
                byte[][] keys)
                  throws RocksDBException

This function is similar to RocksDB.multiGet(ReadOptions, List, List) except it will also read pending changes in this transaction. Currently, this function will return Status::MergeInProgress if the most recent write to the queried key in this batch is a Merge. If ReadOptions.snapshot() is not set, the current version of the key will be read. Calling setSnapshot() does not affect the version of the data returned. Note that setting ReadOptions.setSnapshot(Snapshot) will affect what is read from the DB but will NOT change which keys are read from this transaction (the keys in this transaction do not yet belong to any snapshot and will be fetched regardless).

Parameters:

readOptions - Read options.

columnFamilyHandles - List containing ColumnFamilyHandle instances.

keys - of keys for which values need to be retrieved.

Returns:

Array of values, one for each key

Throws:

RocksDBException - thrown if error happens in underlying native library.

java.lang.IllegalArgumentException - thrown if the size of passed keys is not equal to the amount of passed column family handles.

multiGet

public byte[][] multiGet(ReadOptions readOptions,
                byte[][] keys)
                  throws RocksDBException

This function is similar to RocksDB.multiGet(ReadOptions, List) except it will also read pending changes in this transaction. Currently, this function will return Status::MergeInProgress if the most recent write to the queried key in this batch is a Merge. If ReadOptions.snapshot() is not set, the current version of the key will be read. Calling setSnapshot() does not affect the version of the data returned. Note that setting ReadOptions.setSnapshot(Snapshot) will affect what is read from the DB but will NOT change which keys are read from this transaction (the keys in this transaction do not yet belong to any snapshot and will be fetched regardless).

Parameters:

readOptions - Read options.= ColumnFamilyHandle instances.

keys - of keys for which values need to be retrieved.

Returns:

Array of values, one for each key

Throws:

RocksDBException - thrown if error happens in underlying native library.

getForUpdate

public byte[] getForUpdate(ReadOptions readOptions,
                  ColumnFamilyHandle columnFamilyHandle,
                  byte[] key,
                  boolean exclusive,
                  boolean doValidate)
                    throws RocksDBException

Read this key and ensure that this transaction will only be able to be committed if this key is not written outside this transaction after it has first been read (or after the snapshot if a snapshot is set in this transaction). The transaction behavior is the same regardless of whether the key exists or not. Note: Currently, this function will return Status::MergeInProgress if the most recent write to the queried key in this batch is a Merge. The values returned by this function are similar to RocksDB.get(ColumnFamilyHandle, ReadOptions, byte[]). If value==nullptr, then this function will not read any data, but will still ensure that this key cannot be written to by outside of this transaction. If this transaction was created by an OptimisticTransactionDB, getForUpdate(ReadOptions, ColumnFamilyHandle, byte[], boolean) could cause commit() to fail. Otherwise, it could return any error that could be returned by RocksDB.get(ColumnFamilyHandle, ReadOptions, byte[]). If this transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain() Status.Code.MergeInProgress if merge operations cannot be resolved.

Parameters:

readOptions - Read options.

columnFamilyHandle - ColumnFamilyHandle instance

key - the key to retrieve the value for.

exclusive - true if the transaction should have exclusive access to the key, otherwise false for shared access.

doValidate - true if it should validate the snapshot before doing the read

Returns:

a byte array storing the value associated with the input key if any. null if it does not find the specified key.

Throws:

RocksDBException - thrown if error happens in underlying native library.

getForUpdate

public byte[] getForUpdate(ReadOptions readOptions,
                  ColumnFamilyHandle columnFamilyHandle,
                  byte[] key,
                  boolean exclusive)
                    throws RocksDBException

Same as getForUpdate(ReadOptions, ColumnFamilyHandle, byte[], boolean, boolean) with doValidate=true.

Parameters:

readOptions - Read options.

columnFamilyHandle - ColumnFamilyHandle instance

key - the key to retrieve the value for.

exclusive - true if the transaction should have exclusive access to the key, otherwise false for shared access.

Returns:

a byte array storing the value associated with the input key if any. null if it does not find the specified key.

Throws:

RocksDBException - thrown if error happens in underlying native library.

getForUpdate

public byte[] getForUpdate(ReadOptions readOptions,
                  byte[] key,
                  boolean exclusive)
                    throws RocksDBException

Read this key and ensure that this transaction will only be able to be committed if this key is not written outside this transaction after it has first been read (or after the snapshot if a snapshot is set in this transaction). The transaction behavior is the same regardless of whether the key exists or not. Note: Currently, this function will return Status::MergeInProgress if the most recent write to the queried key in this batch is a Merge. The values returned by this function are similar to RocksDB.get(ReadOptions, byte[]). If value==nullptr, then this function will not read any data, but will still ensure that this key cannot be written to by outside of this transaction. If this transaction was created on an OptimisticTransactionDB, getForUpdate(ReadOptions, ColumnFamilyHandle, byte[], boolean) could cause commit() to fail. Otherwise, it could return any error that could be returned by RocksDB.get(ReadOptions, byte[]). If this transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain() Status.Code.MergeInProgress if merge operations cannot be resolved.

Parameters:

readOptions - Read options.

key - the key to retrieve the value for.

exclusive - true if the transaction should have exclusive access to the key, otherwise false for shared access.

Returns:

a byte array storing the value associated with the input key if any. null if it does not find the specified key.

Throws:

RocksDBException - thrown if error happens in underlying native library.

multiGetForUpdate

public byte[][] multiGetForUpdate(ReadOptions readOptions,
                         java.util.List<ColumnFamilyHandle> columnFamilyHandles,
                         byte[][] keys)
                           throws RocksDBException

A multi-key version of getForUpdate(ReadOptions, ColumnFamilyHandle, byte[], boolean).

Parameters:

readOptions - Read options.

columnFamilyHandles - ColumnFamilyHandle instances

keys - the keys to retrieve the values for.

Returns:

Array of values, one for each key

Throws:

RocksDBException - thrown if error happens in underlying native library.

multiGetForUpdate

public byte[][] multiGetForUpdate(ReadOptions readOptions,
                         byte[][] keys)
                           throws RocksDBException

A multi-key version of getForUpdate(ReadOptions, byte[], boolean).

Parameters:

readOptions - Read options.

keys - the keys to retrieve the values for.

Returns:

Array of values, one for each key

Throws:

RocksDBException - thrown if error happens in underlying native library.

getIterator

public RocksIterator getIterator(ReadOptions readOptions)

Returns an iterator that will iterate on all keys in the default column family including both keys in the DB and uncommitted keys in this transaction. Setting ReadOptions.setSnapshot(Snapshot) will affect what is read from the DB but will NOT change which keys are read from this transaction (the keys in this transaction do not yet belong to any snapshot and will be fetched regardless). Caller is responsible for deleting the returned Iterator. The returned iterator is only valid until commit(), rollback(), or rollbackToSavePoint() is called.

Parameters:

readOptions - Read options.

Returns:

instance of iterator object.

getIterator

public RocksIterator getIterator(ReadOptions readOptions,
                        ColumnFamilyHandle columnFamilyHandle)

Returns an iterator that will iterate on all keys in the column family specified by columnFamilyHandle including both keys in the DB and uncommitted keys in this transaction. Setting ReadOptions.setSnapshot(Snapshot) will affect what is read from the DB but will NOT change which keys are read from this transaction (the keys in this transaction do not yet belong to any snapshot and will be fetched regardless). Caller is responsible for calling AbstractImmutableNativeReference.close() on the returned Iterator. The returned iterator is only valid until commit(), rollback(), or rollbackToSavePoint() is called.

Parameters:

readOptions - Read options.

columnFamilyHandle - ColumnFamilyHandle instance

Returns:

instance of iterator object.

put

public void put(ColumnFamilyHandle columnFamilyHandle,
       byte[] key,
       byte[] value,
       boolean assumeTracked)
         throws RocksDBException

Similar to RocksDB.put(ColumnFamilyHandle, byte[], byte[]), but will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

columnFamilyHandle - The column family to put the key/value into

key - the specified key to be inserted.

value - the value associated with the specified key.

assumeTracked - true when it is expected that the key is already tracked. More specifically, it means the the key was previous tracked in the same savepoint, with the same exclusive flag, and at a lower sequence number. If valid then it skips ValidateSnapshot, throws an error otherwise.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

put

public void put(ColumnFamilyHandle columnFamilyHandle,
       byte[] key,
       byte[] value)
         throws RocksDBException

Similar to put(ColumnFamilyHandle, byte[], byte[], boolean) but with assumeTracked = false. Will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

columnFamilyHandle - The column family to put the key/value into

key - the specified key to be inserted.

value - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

put

public void put(byte[] key,
       byte[] value)
         throws RocksDBException

Similar to RocksDB.put(byte[], byte[]), but will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

key - the specified key to be inserted.

value - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

put

public void put(ColumnFamilyHandle columnFamilyHandle,
       byte[][] keyParts,
       byte[][] valueParts,
       boolean assumeTracked)
         throws RocksDBException

Similar to put(ColumnFamilyHandle, byte[], byte[]) but allows you to specify the key and value in several parts that will be concatenated together.

Parameters:

columnFamilyHandle - The column family to put the key/value into

keyParts - the specified key to be inserted.

valueParts - the value associated with the specified key.

assumeTracked - true when it is expected that the key is already tracked. More specifically, it means the the key was previous tracked in the same savepoint, with the same exclusive flag, and at a lower sequence number. If valid then it skips ValidateSnapshot, throws an error otherwise.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

put

public void put(ColumnFamilyHandle columnFamilyHandle,
       byte[][] keyParts,
       byte[][] valueParts)
         throws RocksDBException

Similar to put(ColumnFamilyHandle, byte[][], byte[][], boolean) but with with assumeTracked = false. Allows you to specify the key and value in several parts that will be concatenated together.

Parameters:

columnFamilyHandle - The column family to put the key/value into

keyParts - the specified key to be inserted.

valueParts - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

put

public void put(byte[][] keyParts,
       byte[][] valueParts)
         throws RocksDBException

Similar to put(byte[], byte[]) but allows you to specify the key and value in several parts that will be concatenated together

Parameters:

keyParts - the specified key to be inserted.

valueParts - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

merge

public void merge(ColumnFamilyHandle columnFamilyHandle,
         byte[] key,
         byte[] value,
         boolean assumeTracked)
           throws RocksDBException

Similar to RocksDB.merge(ColumnFamilyHandle, byte[], byte[]), but will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

columnFamilyHandle - The column family to merge the key/value into

key - the specified key to be merged.

value - the value associated with the specified key.

assumeTracked - true when it is expected that the key is already tracked. More specifically, it means the the key was previous tracked in the same savepoint, with the same exclusive flag, and at a lower sequence number. If valid then it skips ValidateSnapshot, throws an error otherwise.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

merge

public void merge(ColumnFamilyHandle columnFamilyHandle,
         byte[] key,
         byte[] value)
           throws RocksDBException

Similar to merge(ColumnFamilyHandle, byte[], byte[], boolean) but with assumeTracked = false. Will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

columnFamilyHandle - The column family to merge the key/value into

key - the specified key to be merged.

value - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

merge

public void merge(byte[] key,
         byte[] value)
           throws RocksDBException

Similar to RocksDB.merge(byte[], byte[]), but will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

key - the specified key to be merged.

value - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

delete

public void delete(ColumnFamilyHandle columnFamilyHandle,
          byte[] key,
          boolean assumeTracked)
            throws RocksDBException

Similar to RocksDB.delete(ColumnFamilyHandle, byte[]), but will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

columnFamilyHandle - The column family to delete the key/value from

key - the specified key to be deleted.

assumeTracked - true when it is expected that the key is already tracked. More specifically, it means the the key was previous tracked in the same savepoint, with the same exclusive flag, and at a lower sequence number. If valid then it skips ValidateSnapshot, throws an error otherwise.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

delete

public void delete(ColumnFamilyHandle columnFamilyHandle,
          byte[] key)
            throws RocksDBException

Similar to delete(ColumnFamilyHandle, byte[], boolean) but with assumeTracked = false. Will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

columnFamilyHandle - The column family to delete the key/value from

key - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

delete

public void delete(byte[] key)
            throws RocksDBException

Similar to RocksDB.delete(byte[]), but will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

key - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

delete

public void delete(ColumnFamilyHandle columnFamilyHandle,
          byte[][] keyParts,
          boolean assumeTracked)
            throws RocksDBException

Similar to delete(ColumnFamilyHandle, byte[]) but allows you to specify the key in several parts that will be concatenated together.

Parameters:

columnFamilyHandle - The column family to delete the key/value from

keyParts - the specified key to be deleted.

assumeTracked - true when it is expected that the key is already tracked. More specifically, it means the the key was previous tracked in the same savepoint, with the same exclusive flag, and at a lower sequence number. If valid then it skips ValidateSnapshot, throws an error otherwise.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

delete

public void delete(ColumnFamilyHandle columnFamilyHandle,
          byte[][] keyParts)
            throws RocksDBException

Similar todelete(ColumnFamilyHandle, byte[][], boolean) but with assumeTracked = false. Allows you to specify the key in several parts that will be concatenated together.

Parameters:

columnFamilyHandle - The column family to delete the key/value from

keyParts - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

delete

public void delete(byte[][] keyParts)
            throws RocksDBException

Similar to delete(byte[]) but allows you to specify key the in several parts that will be concatenated together.

Parameters:

keyParts - the specified key to be deleted

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

singleDelete

@Experimental(value="Performance optimization for a very specific workload")
public void singleDelete(ColumnFamilyHandle columnFamilyHandle,
                                  byte[] key,
                                  boolean assumeTracked)
                  throws RocksDBException

Similar to RocksDB.singleDelete(ColumnFamilyHandle, byte[]), but will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

columnFamilyHandle - The column family to delete the key/value from

key - the specified key to be deleted.

assumeTracked - true when it is expected that the key is already tracked. More specifically, it means the the key was previous tracked in the same savepoint, with the same exclusive flag, and at a lower sequence number. If valid then it skips ValidateSnapshot, throws an error otherwise.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

singleDelete

@Experimental(value="Performance optimization for a very specific workload")
public void singleDelete(ColumnFamilyHandle columnFamilyHandle,
                                  byte[] key)
                  throws RocksDBException

Similar to singleDelete(ColumnFamilyHandle, byte[], boolean) but with assumeTracked = false. will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

columnFamilyHandle - The column family to delete the key/value from

key - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

singleDelete

@Experimental(value="Performance optimization for a very specific workload")
public void singleDelete(byte[] key)
                  throws RocksDBException

Similar to RocksDB.singleDelete(byte[]), but will also perform conflict checking on the keys be written. If this Transaction was created on an OptimisticTransactionDB, these functions should always succeed. If this Transaction was created on a TransactionDB, an RocksDBException may be thrown with an accompanying Status when: Status.Code.Busy if there is a write conflict, Status.Code.TimedOut if a lock could not be acquired, Status.Code.TryAgain if the memtable history size is not large enough. See ColumnFamilyOptions.maxWriteBufferNumberToMaintain()

Parameters:

key - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

singleDelete

@Experimental(value="Performance optimization for a very specific workload")
public void singleDelete(ColumnFamilyHandle columnFamilyHandle,
                                  byte[][] keyParts,
                                  boolean assumeTracked)
                  throws RocksDBException

Similar to singleDelete(ColumnFamilyHandle, byte[]) but allows you to specify the key in several parts that will be concatenated together.

Parameters:

columnFamilyHandle - The column family to delete the key/value from

keyParts - the specified key to be deleted.

assumeTracked - true when it is expected that the key is already tracked. More specifically, it means the the key was previous tracked in the same savepoint, with the same exclusive flag, and at a lower sequence number. If valid then it skips ValidateSnapshot, throws an error otherwise.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

singleDelete

@Experimental(value="Performance optimization for a very specific workload")
public void singleDelete(ColumnFamilyHandle columnFamilyHandle,
                                  byte[][] keyParts)
                  throws RocksDBException

Similar tosingleDelete(ColumnFamilyHandle, byte[][], boolean) but with assumeTracked = false. Allows you to specify the key in several parts that will be concatenated together.

Parameters:

columnFamilyHandle - The column family to delete the key/value from

keyParts - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

singleDelete

@Experimental(value="Performance optimization for a very specific workload")
public void singleDelete(byte[][] keyParts)
                  throws RocksDBException

Similar to singleDelete(byte[]) but allows you to specify the key in several parts that will be concatenated together.

Parameters:

keyParts - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

putUntracked

public void putUntracked(ColumnFamilyHandle columnFamilyHandle,
                byte[] key,
                byte[] value)
                  throws RocksDBException

Similar to RocksDB.put(ColumnFamilyHandle, byte[], byte[]), but operates on the transactions write batch. This write will only happen if this transaction gets committed successfully. Unlike put(ColumnFamilyHandle, byte[], byte[]) no conflict checking will be performed for this key. If this Transaction was created on a TransactionDB, this function will still acquire locks necessary to make sure this write doesn't cause conflicts in other transactions; This may cause a RocksDBException with associated Status.Code.Busy.

Parameters:

columnFamilyHandle - The column family to put the key/value into

key - the specified key to be inserted.

value - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

putUntracked

public void putUntracked(byte[] key,
                byte[] value)
                  throws RocksDBException

Similar to RocksDB.put(byte[], byte[]), but operates on the transactions write batch. This write will only happen if this transaction gets committed successfully. Unlike put(byte[], byte[]) no conflict checking will be performed for this key. If this Transaction was created on a TransactionDB, this function will still acquire locks necessary to make sure this write doesn't cause conflicts in other transactions; This may cause a RocksDBException with associated Status.Code.Busy.

Parameters:

key - the specified key to be inserted.

value - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

putUntracked

public void putUntracked(ColumnFamilyHandle columnFamilyHandle,
                byte[][] keyParts,
                byte[][] valueParts)
                  throws RocksDBException

Similar to putUntracked(ColumnFamilyHandle, byte[], byte[]) but allows you to specify the key and value in several parts that will be concatenated together.

Parameters:

columnFamilyHandle - The column family to put the key/value into

keyParts - the specified key to be inserted.

valueParts - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

putUntracked

public void putUntracked(byte[][] keyParts,
                byte[][] valueParts)
                  throws RocksDBException

Similar to putUntracked(byte[], byte[]) but allows you to specify the key and value in several parts that will be concatenated together.

Parameters:

keyParts - the specified key to be inserted.

valueParts - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

mergeUntracked

public void mergeUntracked(ColumnFamilyHandle columnFamilyHandle,
                  byte[] key,
                  byte[] value)
                    throws RocksDBException

Similar to RocksDB.merge(ColumnFamilyHandle, byte[], byte[]), but operates on the transactions write batch. This write will only happen if this transaction gets committed successfully. Unlike merge(ColumnFamilyHandle, byte[], byte[]) no conflict checking will be performed for this key. If this Transaction was created on a TransactionDB, this function will still acquire locks necessary to make sure this write doesn't cause conflicts in other transactions; This may cause a RocksDBException with associated Status.Code.Busy.

Parameters:

columnFamilyHandle - The column family to merge the key/value into

key - the specified key to be merged.

value - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

mergeUntracked

public void mergeUntracked(byte[] key,
                  byte[] value)
                    throws RocksDBException

Similar to RocksDB.merge(byte[], byte[]), but operates on the transactions write batch. This write will only happen if this transaction gets committed successfully. Unlike merge(byte[], byte[]) no conflict checking will be performed for this key. If this Transaction was created on a TransactionDB, this function will still acquire locks necessary to make sure this write doesn't cause conflicts in other transactions; This may cause a RocksDBException with associated Status.Code.Busy.

Parameters:

key - the specified key to be merged.

value - the value associated with the specified key.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

deleteUntracked

public void deleteUntracked(ColumnFamilyHandle columnFamilyHandle,
                   byte[] key)
                     throws RocksDBException

Similar to RocksDB.delete(ColumnFamilyHandle, byte[]), but operates on the transactions write batch. This write will only happen if this transaction gets committed successfully. Unlike delete(ColumnFamilyHandle, byte[]) no conflict checking will be performed for this key. If this Transaction was created on a TransactionDB, this function will still acquire locks necessary to make sure this write doesn't cause conflicts in other transactions; This may cause a RocksDBException with associated Status.Code.Busy.

Parameters:

columnFamilyHandle - The column family to delete the key/value from

key - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

deleteUntracked

public void deleteUntracked(byte[] key)
                     throws RocksDBException

Similar to RocksDB.delete(byte[]), but operates on the transactions write batch. This write will only happen if this transaction gets committed successfully. Unlike delete(byte[]) no conflict checking will be performed for this key. If this Transaction was created on a TransactionDB, this function will still acquire locks necessary to make sure this write doesn't cause conflicts in other transactions; This may cause a RocksDBException with associated Status.Code.Busy.

Parameters:

key - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

deleteUntracked

public void deleteUntracked(ColumnFamilyHandle columnFamilyHandle,
                   byte[][] keyParts)
                     throws RocksDBException

Similar to deleteUntracked(ColumnFamilyHandle, byte[]) but allows you to specify the key in several parts that will be concatenated together.

Parameters:

columnFamilyHandle - The column family to delete the key/value from

keyParts - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

deleteUntracked

public void deleteUntracked(byte[][] keyParts)
                     throws RocksDBException

Similar to deleteUntracked(byte[]) but allows you to specify the key in several parts that will be concatenated together.

Parameters:

keyParts - the specified key to be deleted.

Throws:

RocksDBException - when one of the TransactionalDB conditions described above occurs, or in the case of an unexpected error

putLogData

public void putLogData(byte[] blob)

Similar to AbstractWriteBatch.putLogData(byte[])

Parameters:

blob - binary object to be inserted

disableIndexing

public void disableIndexing()

By default, all put/merge/delete operations will be indexed in the transaction so that get/getForUpdate/getIterator can search for these keys. If the caller does not want to fetch the keys about to be written, they may want to avoid indexing as a performance optimization. Calling disableIndexing() will turn off indexing for all future put/merge/delete operations until enableIndexing() is called. If a key is put/merge/deleted after disableIndexing() is called and then is fetched via get/getForUpdate/getIterator, the result of the fetch is undefined.

enableIndexing

public void enableIndexing()

Re-enables indexing after a previous call to disableIndexing()

getNumKeys

public long getNumKeys()

Returns the number of distinct Keys being tracked by this transaction. If this transaction was created by a TransactionDB, this is the number of keys that are currently locked by this transaction. If this transaction was created by an OptimisticTransactionDB, this is the number of keys that need to be checked for conflicts at commit time.

Returns:

the number of distinct Keys being tracked by this transaction

getNumPuts

public long getNumPuts()

Returns the number of puts that have been applied to this transaction so far.

Returns:

the number of puts that have been applied to this transaction

getNumDeletes

public long getNumDeletes()

Returns the number of deletes that have been applied to this transaction so far.

Returns:

the number of deletes that have been applied to this transaction

getNumMerges

public long getNumMerges()

Returns the number of merges that have been applied to this transaction so far.

Returns:

the number of merges that have been applied to this transaction

getElapsedTime

public long getElapsedTime()

Returns the elapsed time in milliseconds since this Transaction began.

Returns:

the elapsed time in milliseconds since this transaction began.

getWriteBatch

public WriteBatchWithIndex getWriteBatch()

Fetch the underlying write batch that contains all pending changes to be committed. Note: You should not write or delete anything from the batch directly and should only use the functions in the Transaction class to write to this transaction.

Returns:

The write batch

setLockTimeout

public void setLockTimeout(long lockTimeout)

Change the value of TransactionOptions.getLockTimeout() (in milliseconds) for this transaction. Has no effect on OptimisticTransactions.

Parameters:

lockTimeout - the timeout (in milliseconds) for locks used by this transaction.

getWriteOptions

public WriteOptions getWriteOptions()

Return the WriteOptions that will be used during commit().

Returns:

the WriteOptions that will be used

setWriteOptions

public void setWriteOptions(WriteOptions writeOptions)

Reset the WriteOptions that will be used during commit().

Parameters:

writeOptions - The new WriteOptions

undoGetForUpdate

public void undoGetForUpdate(ColumnFamilyHandle columnFamilyHandle,
                    byte[] key)

If this key was previously fetched in this transaction using getForUpdate(ReadOptions, ColumnFamilyHandle, byte[], boolean)/ multiGetForUpdate(ReadOptions, List, byte[][]), calling undoGetForUpdate(ColumnFamilyHandle, byte[]) will tell the transaction that it no longer needs to do any conflict checking for this key. If a key has been fetched N times via getForUpdate(ReadOptions, ColumnFamilyHandle, byte[], boolean)/ multiGetForUpdate(ReadOptions, List, byte[][]), then undoGetForUpdate(ColumnFamilyHandle, byte[]) will only have an effect if it is also called N times. If this key has been written to in this transaction, undoGetForUpdate(ColumnFamilyHandle, byte[]) will have no effect. If setSavePoint() has been called after the getForUpdate(ReadOptions, ColumnFamilyHandle, byte[], boolean), undoGetForUpdate(ColumnFamilyHandle, byte[]) will not have any effect. If this Transaction was created by an OptimisticTransactionDB, calling undoGetForUpdate(ColumnFamilyHandle, byte[]) can affect whether this key is conflict checked at commit time. If this Transaction was created by a TransactionDB, calling undoGetForUpdate(ColumnFamilyHandle, byte[]) may release any held locks for this key.

Parameters:

columnFamilyHandle - ColumnFamilyHandle instance

key - the key to retrieve the value for.

undoGetForUpdate

public void undoGetForUpdate(byte[] key)

If this key was previously fetched in this transaction using getForUpdate(ReadOptions, byte[], boolean)/ multiGetForUpdate(ReadOptions, List, byte[][]), calling undoGetForUpdate(byte[]) will tell the transaction that it no longer needs to do any conflict checking for this key. If a key has been fetched N times via getForUpdate(ReadOptions, byte[], boolean)/ multiGetForUpdate(ReadOptions, List, byte[][]), then undoGetForUpdate(byte[]) will only have an effect if it is also called N times. If this key has been written to in this transaction, undoGetForUpdate(byte[]) will have no effect. If setSavePoint() has been called after the getForUpdate(ReadOptions, byte[], boolean), undoGetForUpdate(byte[]) will not have any effect. If this Transaction was created by an OptimisticTransactionDB, calling undoGetForUpdate(byte[]) can affect whether this key is conflict checked at commit time. If this Transaction was created by a TransactionDB, calling undoGetForUpdate(byte[]) may release any held locks for this key.

Parameters:

key - the key to retrieve the value for.

rebuildFromWriteBatch

public void rebuildFromWriteBatch(WriteBatch writeBatch)
                           throws RocksDBException

Adds the keys from the WriteBatch to the transaction

Parameters:

writeBatch - The write batch to read from

Throws:

RocksDBException - if an error occurs whilst rebuilding from the write batch.

getCommitTimeWriteBatch

public WriteBatch getCommitTimeWriteBatch()

Get the Commit time Write Batch.

Returns:

the commit time write batch.

setLogNumber

public void setLogNumber(long logNumber)

Set the log number.

Parameters:

logNumber - the log number

getLogNumber

public long getLogNumber()

Get the log number.

Returns:

the log number

setName

public void setName(java.lang.String transactionName)
             throws RocksDBException

Set the name of the transaction.

Parameters:

transactionName - the name of the transaction

Throws:

RocksDBException - if an error occurs when setting the transaction name.

getName

public java.lang.String getName()

Get the name of the transaction.

Returns:

the name of the transaction

getID

public long getID()

Get the ID of the transaction.

Returns:

the ID of the transaction.

isDeadlockDetect

public boolean isDeadlockDetect()

Determine if a deadlock has been detected.

Returns:

true if a deadlock has been detected.

getWaitingTxns

public Transaction.WaitingTransactions getWaitingTxns()

Get the list of waiting transactions.

Returns:

The list of waiting transactions.

getState

public Transaction.TransactionState getState()

Get the execution status of the transaction. NOTE: The execution status of an Optimistic Transaction never changes. This is only useful for non-optimistic transactions!

Returns:

The execution status of the transaction

getId

@Experimental(value="NOTE: Experimental feature")
public long getId()

The globally unique id with which the transaction is identified. This id might or might not be set depending on the implementation. Similarly the implementation decides the point in lifetime of a transaction at which it assigns the id. Although currently it is the case, the id is not guaranteed to remain the same across restarts.

Returns:

the transaction id.

disposeInternal

protected final void disposeInternal(long handle)

Specified by:

disposeInternal in class RocksObject