org.apache.cassandra.db.compaction

Class LazilyCompactedRow.Reducer

java.lang.Object

org.apache.cassandra.utils.MergeIterator.Reducer<OnDiskAtom,OnDiskAtom>

org.apache.cassandra.db.compaction.LazilyCompactedRow.Reducer

Enclosing class:

LazilyCompactedRow

protected class LazilyCompactedRow.Reducer
extends MergeIterator.Reducer<OnDiskAtom,OnDiskAtom>

Field Summary

Fields

Modifier and Type	Field and Description
int	columns
boolean	hasLegacyCounterShards
java.util.List<java.nio.ByteBuffer>	maxColumnNameSeen
java.util.List<java.nio.ByteBuffer>	minColumnNameSeen
RangeTombstone	tombstone
StreamingHistogram	tombstones

Constructor Summary

Constructors

Constructor and Description
Reducer()

Method Summary

Modifier and Type	Method and Description
protected OnDiskAtom	getReduced() Called after reduce() has been called for each cell sharing the same name.
void	reduce(OnDiskAtom current) Called once per version of a cell that we need to merge, after which getReduced() is called.

Methods inherited from class org.apache.cassandra.utils.MergeIterator.Reducer

close, onKeyChange, trivialReduceIsTrivial

Methods inherited from class java.lang.Object

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

Field Detail

tombstone

public RangeTombstone tombstone

columns

public int columns

tombstones

public StreamingHistogram tombstones

minColumnNameSeen

public java.util.List<java.nio.ByteBuffer> minColumnNameSeen

maxColumnNameSeen

public java.util.List<java.nio.ByteBuffer> maxColumnNameSeen

hasLegacyCounterShards

public boolean hasLegacyCounterShards

Constructor Detail

Reducer

public Reducer()

Method Detail

reduce

public void reduce(OnDiskAtom current)

Called once per version of a cell that we need to merge, after which getReduced() is called. In other words, this will be called one or more times with cells that share the same column name.

Specified by:

reduce in class MergeIterator.Reducer<OnDiskAtom,OnDiskAtom>

getReduced

protected OnDiskAtom getReduced()

Called after reduce() has been called for each cell sharing the same name.

Specified by:

getReduced in class MergeIterator.Reducer<OnDiskAtom,OnDiskAtom>

Returns:

The last object computed by reduce