org.apache.cassandra.db.partitions

Class CachedBTreePartition

java.lang.Object

org.apache.cassandra.db.partitions.AbstractBTreePartition

org.apache.cassandra.db.partitions.ImmutableBTreePartition

org.apache.cassandra.db.partitions.CachedBTreePartition

All Implemented Interfaces:

java.lang.Iterable<Row>, IRowCacheEntry, CachedPartition, Partition

public class CachedBTreePartition
extends ImmutableBTreePartition
implements CachedPartition

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.db.partitions.AbstractBTreePartition

AbstractBTreePartition.Holder, AbstractBTreePartition.SliceableIterator, AbstractBTreePartition.SlicesIterator

Field Summary

Fields inherited from class org.apache.cassandra.db.partitions.ImmutableBTreePartition

holder

Fields inherited from class org.apache.cassandra.db.partitions.AbstractBTreePartition

EMPTY, metadata, partitionKey

Fields inherited from interface org.apache.cassandra.db.partitions.CachedPartition

cacheSerializer

Method Summary

Modifier and Type	Method and Description
int	cachedLiveRows() The number of rows that were live at the time the partition was cached.
static CachedBTreePartition	create(UnfilteredRowIterator iterator, int nowInSec) Creates an ArrayBackedCachedPartition holding all the data of the provided iterator.
static CachedBTreePartition	create(UnfilteredRowIterator iterator, int initialRowCapacity, int nowInSec) Creates an ArrayBackedCachedPartition holding all the data of the provided iterator.
int	nonExpiringLiveCells() The number of cells in this cached partition that are neither tombstone nor expiring.
int	nonTombstoneCellCount() The number of cell objects that are not tombstone in this cached partition.
int	rowsWithNonExpiringCells() The number of rows in this cached partition that have at least one non-expiring non-deleted cell.

Methods inherited from class org.apache.cassandra.db.partitions.ImmutableBTreePartition

canHaveShadowedData, create, create, create, holder

Methods inherited from class org.apache.cassandra.db.partitions.AbstractBTreePartition

build, build, build, columns, deletionInfo, getRow, hasRows, isEmpty, iterator, lastRow, metadata, partitionKey, partitionLevelDeletion, rowCount, searchIterator, sliceableUnfilteredIterator, sliceableUnfilteredIterator, staticRow, stats, toString, unfilteredIterator, unfilteredIterator, unfilteredIterator

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.db.partitions.CachedPartition

lastRow, rowCount

Methods inherited from interface org.apache.cassandra.db.partitions.Partition

columns, getRow, isEmpty, metadata, partitionKey, partitionLevelDeletion, searchIterator, stats, unfilteredIterator, unfilteredIterator

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Method Detail

create

public static CachedBTreePartition create(UnfilteredRowIterator iterator,
                                          int nowInSec)

Creates an ArrayBackedCachedPartition holding all the data of the provided iterator. Warning: Note that this method does not close the provided iterator and it is up to the caller to do so.

Parameters:

iterator - the iterator got gather in memory.

nowInSec - the time of the creation in seconds. This is the time at which cachedLiveRows applies.

Returns:

the created partition.

create

public static CachedBTreePartition create(UnfilteredRowIterator iterator,
                                          int initialRowCapacity,
                                          int nowInSec)

Creates an ArrayBackedCachedPartition holding all the data of the provided iterator. Warning: Note that this method does not close the provided iterator and it is up to the caller to do so.

Parameters:

iterator - the iterator got gather in memory.

initialRowCapacity - sizing hint (in rows) to use for the created partition. It should ideally correspond or be a good estimation of the number or rows in iterator.

nowInSec - the time of the creation in seconds. This is the time at which cachedLiveRows applies.

Returns:

the created partition.

cachedLiveRows

public int cachedLiveRows()

The number of rows that were live at the time the partition was cached. See ColumnFamilyStore.isFilterFullyCoveredBy(org.apache.cassandra.db.filter.ClusteringIndexFilter, org.apache.cassandra.db.filter.DataLimits, org.apache.cassandra.db.partitions.CachedPartition, int) to see why we need this.

Specified by:

cachedLiveRows in interface CachedPartition

Returns:

the number of rows in this partition that were live at the time the partition was cached (this can be different from the number of live rows now due to expiring cells).

rowsWithNonExpiringCells

public int rowsWithNonExpiringCells()

The number of rows in this cached partition that have at least one non-expiring non-deleted cell. Note that this is generally not a very meaningful number, but this is used by DataLimits.hasEnoughLiveData(org.apache.cassandra.db.partitions.CachedPartition, int) as an optimization.

Specified by:

rowsWithNonExpiringCells in interface CachedPartition

Returns:

the number of row that have at least one non-expiring non-deleted cell.

nonTombstoneCellCount

public int nonTombstoneCellCount()

Description copied from interface: CachedPartition

The number of cell objects that are not tombstone in this cached partition. Please note that this is not the number of live cells since some of the cells might be expired.

Specified by:

nonTombstoneCellCount in interface CachedPartition

Returns:

the number of non tombstone cells in the partition.

nonExpiringLiveCells

public int nonExpiringLiveCells()

Description copied from interface: CachedPartition

The number of cells in this cached partition that are neither tombstone nor expiring. Note that this is generally not a very meaningful number, but this is used by DataLimits#hasEnoughLiveData as an optimization.

Specified by:

nonExpiringLiveCells in interface CachedPartition

Returns:

the number of cells that are neither tombstones nor expiring.