org.apache.cassandra.db.compaction
Class CompactionController

java.lang.Object
  org.apache.cassandra.db.compaction.CompactionController

public class CompactionController
extends java.lang.Object

Manage compaction options.

Field Summary

int	gcBefore
boolean	keyExistenceIsExpensive
int	mergeShardBefore

Constructor Summary

CompactionController(ColumnFamilyStore cfs, java.util.Collection<SSTableReader> sstables, int gcBefore, boolean forceDeserialize)

Method Summary

java.lang.String	getColumnFamily()
AbstractCompactedRow	getCompactedRow(java.util.List<SSTableIdentityIterator> rows)
AbstractCompactedRow	getCompactedRow(SSTableIdentityIterator row) convenience method for single-sstable compactions
java.lang.String	getKeyspace()
void	invalidateCachedRow(DecoratedKey key)
boolean	needDeserialize()
void	removeDeletedInCache(DecoratedKey key)
boolean	shouldPurge(DecoratedKey key)

Methods inherited from class java.lang.Object

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

Field Detail

gcBefore

public final int gcBefore

keyExistenceIsExpensive

public boolean keyExistenceIsExpensive

mergeShardBefore

public final int mergeShardBefore

Constructor Detail

CompactionController

public CompactionController(ColumnFamilyStore cfs,
                            java.util.Collection<SSTableReader> sstables,
                            int gcBefore,
                            boolean forceDeserialize)

Method Detail

getKeyspace

public java.lang.String getKeyspace()

getColumnFamily

public java.lang.String getColumnFamily()

shouldPurge

public boolean shouldPurge(DecoratedKey key)

Returns:

true if it's okay to drop tombstones for the given row, i.e., if we know all the verisons of the row are included in the compaction set

needDeserialize

public boolean needDeserialize()

invalidateCachedRow

public void invalidateCachedRow(DecoratedKey key)

removeDeletedInCache

public void removeDeletedInCache(DecoratedKey key)

getCompactedRow

public AbstractCompactedRow getCompactedRow(java.util.List<SSTableIdentityIterator> rows)

Returns:

an AbstractCompactedRow implementation to write the merged rows in question. If there is a single source row, the data is from a current-version sstable, we don't need to purge and we aren't forcing deserialization for scrub, write it unchanged. Otherwise, we deserialize, purge tombstones, and reserialize in the latest version.

getCompactedRow

public AbstractCompactedRow getCompactedRow(SSTableIdentityIterator row)

convenience method for single-sstable compactions