org.apache.cassandra.db.compaction
Class LeveledCompactionStrategy

java.lang.Object
  org.apache.cassandra.db.compaction.AbstractCompactionStrategy
      org.apache.cassandra.db.compaction.LeveledCompactionStrategy

All Implemented Interfaces:

INotificationConsumer

public class LeveledCompactionStrategy
extends AbstractCompactionStrategy
implements INotificationConsumer

Field Summary

Fields inherited from class org.apache.cassandra.db.compaction.AbstractCompactionStrategy

cfs, options

Constructor Summary

LeveledCompactionStrategy(ColumnFamilyStore cfs, java.util.Map<java.lang.String,java.lang.String> options)

Method Summary

java.util.List<AbstractCompactionTask>	getBackgroundTasks(int gcBefore)
int	getEstimatedRemainingTasks()
int	getLevelSize(int i)
java.util.List<AbstractCompactionTask>	getMaximalTasks(int gcBefore)
long	getMaxSSTableSize()
AbstractCompactionTask	getUserDefinedTask(java.util.Collection<SSTableReader> sstables, int gcBefore)
void	handleNotification(INotification notification, java.lang.Object sender)
boolean	isKeyExistenceExpensive(java.util.Set<? extends SSTable> sstablesToIgnore)
void	shutdown() Releases any resources if this strategy is shutdown (when the CFS is reloaded after a schema change).
java.lang.String	toString()

Methods inherited from class org.apache.cassandra.db.compaction.AbstractCompactionStrategy

getOptions

Methods inherited from class java.lang.Object

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

Constructor Detail

LeveledCompactionStrategy

public LeveledCompactionStrategy(ColumnFamilyStore cfs,
                                 java.util.Map<java.lang.String,java.lang.String> options)

Method Detail

shutdown

public void shutdown()

Description copied from class: AbstractCompactionStrategy

Releases any resources if this strategy is shutdown (when the CFS is reloaded after a schema change). Default is to do nothing.

Overrides:

shutdown in class AbstractCompactionStrategy

getLevelSize

public int getLevelSize(int i)

getBackgroundTasks

public java.util.List<AbstractCompactionTask> getBackgroundTasks(int gcBefore)

Specified by:

getBackgroundTasks in class AbstractCompactionStrategy

Parameters:

gcBefore - throw away tombstones older than this

Returns:

a list of compaction tasks that should run in the background to get the sstable count down to desired parameters. Will not be null, but may be empty.

getMaximalTasks

public java.util.List<AbstractCompactionTask> getMaximalTasks(int gcBefore)

Specified by:

getMaximalTasks in class AbstractCompactionStrategy

Parameters:

gcBefore - throw away tombstones older than this

Returns:

a list of compaction tasks that should be run to compact this columnfamilystore as much as possible. Will not be null, but may be empty.

getUserDefinedTask

public AbstractCompactionTask getUserDefinedTask(java.util.Collection<SSTableReader> sstables,
                                                 int gcBefore)

Specified by:

getUserDefinedTask in class AbstractCompactionStrategy

gcBefore - throw away tombstones older than this

Returns:

a compaction task corresponding to the requested sstables. Will not be null. (Will throw if user requests an invalid compaction.)

getEstimatedRemainingTasks

public int getEstimatedRemainingTasks()

Specified by:

getEstimatedRemainingTasks in class AbstractCompactionStrategy

Returns:

the number of background tasks estimated to still be needed for this columnfamilystore

handleNotification

public void handleNotification(INotification notification,
                               java.lang.Object sender)

Specified by:

handleNotification in interface INotificationConsumer

getMaxSSTableSize

public long getMaxSSTableSize()

Specified by:

getMaxSSTableSize in class AbstractCompactionStrategy

Returns:

size in bytes of the largest sstables for this strategy

isKeyExistenceExpensive

public boolean isKeyExistenceExpensive(java.util.Set<? extends SSTable> sstablesToIgnore)

Specified by:

isKeyExistenceExpensive in class AbstractCompactionStrategy

Returns:

true if checking for whether a key exists, ignoring @param sstablesToIgnore, is going to be expensive

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object