org.apache.cassandra.db.compaction

Class CompactionController

java.lang.Object

org.apache.cassandra.db.compaction.CompactionController

Direct Known Subclasses:

SSTableSplitter.SplitController

public class CompactionController
extends java.lang.Object

Manage compaction options.

Field Summary

Fields

Modifier and Type	Field and Description
ColumnFamilyStore	cfs
int	gcBefore

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CompactionController(ColumnFamilyStore cfs, int maxValue) Constructor that subclasses may use when overriding shouldPurge to not need overlappingTree
	CompactionController(ColumnFamilyStore cfs, java.util.Set<SSTableReader> compacting, int gcBefore)

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
java.lang.String	getColumnFamily()
AbstractCompactedRow	getCompactedRow(java.util.List<SSTableIdentityIterator> rows)
AbstractCompactedRow	getCompactedRow(SSTableIdentityIterator row) convenience method for single-sstable compactions
java.util.Set<SSTableReader>	getFullyExpiredSSTables()
static java.util.Set<SSTableReader>	getFullyExpiredSSTables(ColumnFamilyStore cfStore, java.util.Set<SSTableReader> compacting, java.util.Set<SSTableReader> overlapping, int gcBefore) Finds expired sstables works something like this; 1.
java.lang.String	getKeyspace()
void	invalidateCachedRow(DecoratedKey key)
boolean	shouldPurge(DecoratedKey key, long maxDeletionTimestamp)

Methods inherited from class java.lang.Object

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

Field Detail

cfs

public final ColumnFamilyStore cfs

gcBefore

public final int gcBefore

Constructor Detail

CompactionController

protected CompactionController(ColumnFamilyStore cfs,
                    int maxValue)

Constructor that subclasses may use when overriding shouldPurge to not need overlappingTree

CompactionController

public CompactionController(ColumnFamilyStore cfs,
                    java.util.Set<SSTableReader> compacting,
                    int gcBefore)

Method Detail

getFullyExpiredSSTables

public java.util.Set<SSTableReader> getFullyExpiredSSTables()

getFullyExpiredSSTables

public static java.util.Set<SSTableReader> getFullyExpiredSSTables(ColumnFamilyStore cfStore,
                                                   java.util.Set<SSTableReader> compacting,
                                                   java.util.Set<SSTableReader> overlapping,
                                                   int gcBefore)

Finds expired sstables works something like this; 1. find "global" minTimestamp of overlapping sstables (excluding the possibly droppable ones) 2. build a list of candidates to be dropped 3. sort the candidate list, biggest maxTimestamp first in list 4. check if the candidates to be dropped actually can be dropped (maxTimestamp < global minTimestamp) and it is included in the compaction - if not droppable, update global minTimestamp and remove from candidates 5. return candidates.

Parameters:

cfStore -

compacting - we take the drop-candidates from this set, it is usually the sstables included in the compaction

overlapping - the sstables that overlap the ones in compacting.

gcBefore -

Returns:

getKeyspace

public java.lang.String getKeyspace()

getColumnFamily

public java.lang.String getColumnFamily()

shouldPurge

public boolean shouldPurge(DecoratedKey key,
                  long maxDeletionTimestamp)

Returns:

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

invalidateCachedRow

public void invalidateCachedRow(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

close

public void close()