org.apache.cassandra.db.compaction

Class CompactionController

java.lang.Object

org.apache.cassandra.db.compaction.CompactionController

All Implemented Interfaces:

java.lang.AutoCloseable

Direct Known Subclasses:

SSTableSplitter.SplitController

public class CompactionController
extends java.lang.Object
implements java.lang.AutoCloseable

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

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	compactingRepaired()
java.lang.String	getColumnFamily()
java.util.Set<SSTableReader>	getFullyExpiredSSTables()
static java.util.Set<SSTableReader>	getFullyExpiredSSTables(ColumnFamilyStore cfStore, java.lang.Iterable<SSTableReader> compacting, java.lang.Iterable<SSTableReader> overlapping, int gcBefore) Finds expired sstables works something like this; 1.
java.lang.String	getKeyspace()
long	maxPurgeableTimestamp(DecoratedKey key)
void	maybeRefreshOverlaps()

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)

CompactionController

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

Method Detail

maybeRefreshOverlaps

public void maybeRefreshOverlaps()

getFullyExpiredSSTables

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

getFullyExpiredSSTables

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

Finds expired sstables works something like this; 1. find "global" minTimestamp of overlapping sstables, compacting sstables and memtables containing any non-expired data 2. build a list of fully expired candidates 3. check if the candidates to be dropped actually can be dropped (maxTimestamp < global minTimestamp) - if not droppable, remove from candidates 4. 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()

maxPurgeableTimestamp

public long maxPurgeableTimestamp(DecoratedKey key)

Returns:

the largest timestamp before which it's okay to drop tombstones for the given partition; i.e., after the maxPurgeableTimestamp there may exist newer data that still needs to be suppressed in other sstables. This returns the minimum timestamp for any SSTable that contains this partition and is not participating in this compaction, or memtable that contains this partition, or LONG.MAX_VALUE if no SSTable or memtable exist.

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable

compactingRepaired

public boolean compactingRepaired()