```
@Private
@Evolving
public interface TransactionBufferClient
```
The transaction buffer client to commit and abort transactions on topics or subscription. The transaction buffer client is used by transaction coordinator to end transactions.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.util.concurrent.CompletableFuture<TxnID>`	`abortTxnOnSubscription(java.lang.String topic, java.lang.String subscription, long txnIdMostBits, long txnIdLeastBits, long lowWaterMark)`	Abort the transaction associated with the topic subscription.
`java.util.concurrent.CompletableFuture<TxnID>`	`abortTxnOnTopic(java.lang.String topic, long txnIdMostBits, long txnIdLeastBits, long lowWaterMark)`	Abort the transaction associated with the topic.
`void`	`close()`
`java.util.concurrent.CompletableFuture<TxnID>`	`commitTxnOnSubscription(java.lang.String topic, java.lang.String subscription, long txnIdMostBits, long txnIdLeastBits, long lowWaterMark)`	Commit the transaction associated with the topic subscription.
`java.util.concurrent.CompletableFuture<TxnID>`	`commitTxnOnTopic(java.lang.String topic, long txnIdMostBits, long txnIdLeastBits, long lowWaterMark)`	Commit the transaction associated with the topic.

Method Detail

commitTxnOnTopic

java.util.concurrent.CompletableFuture<TxnID> commitTxnOnTopic(java.lang.String topic,
                                                               long txnIdMostBits,
                                                               long txnIdLeastBits,
                                                               long lowWaterMark)

Commit the transaction associated with the topic.

Parameters:: topic - topic name; txnIdMostBits - the most bits of txn id; txnIdLeastBits - the least bits of txn id; lowWaterMark - the low water mark of this txn;
Returns:: the future represents the commit result

abortTxnOnTopic

java.util.concurrent.CompletableFuture<TxnID> abortTxnOnTopic(java.lang.String topic,
                                                              long txnIdMostBits,
                                                              long txnIdLeastBits,
                                                              long lowWaterMark)

Abort the transaction associated with the topic.

Parameters:: topic - topic name; txnIdMostBits - the most bits of txn id; txnIdLeastBits - the least bits of txn id; lowWaterMark - the low water mark of this txn
Returns:: the future represents the abort result

commitTxnOnSubscription

java.util.concurrent.CompletableFuture<TxnID> commitTxnOnSubscription(java.lang.String topic,
                                                                      java.lang.String subscription,
                                                                      long txnIdMostBits,
                                                                      long txnIdLeastBits,
                                                                      long lowWaterMark)

Commit the transaction associated with the topic subscription.

Parameters:: topic - topic name; subscription - subscription name; txnIdMostBits - the most bits of txn id; txnIdLeastBits - the least bits of txn id; lowWaterMark - the low water mark of this txn
Returns:: the future represents the commit result

abortTxnOnSubscription

java.util.concurrent.CompletableFuture<TxnID> abortTxnOnSubscription(java.lang.String topic,
                                                                     java.lang.String subscription,
                                                                     long txnIdMostBits,
                                                                     long txnIdLeastBits,
                                                                     long lowWaterMark)

Abort the transaction associated with the topic subscription.

Parameters:: topic - topic name; subscription - subscription name; txnIdMostBits - the most bits of txn id; txnIdLeastBits - the least bits of txn id; lowWaterMark - the low water mark of this txn
Returns:: the future represents the abort result

close
```
void close()
```