Package org.apache.cassandra.db.compaction

Class TimeWindowCompactionStrategy

java.lang.Object

org.apache.cassandra.db.compaction.AbstractCompactionStrategy

org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy

public class TimeWindowCompactionStrategy
extends AbstractCompactionStrategy

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.db.compaction.AbstractCompactionStrategy

AbstractCompactionStrategy.ScannerList

Field Summary

Fields

Modifier and Type	Field	Description
protected int	estimatedRemainingTasks

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

cfs, COMPACTION_ENABLED, DEFAULT_LOG_ALL_OPTION, DEFAULT_TOMBSTONE_COMPACTION_INTERVAL, DEFAULT_TOMBSTONE_THRESHOLD, DEFAULT_UNCHECKED_TOMBSTONE_COMPACTION_OPTION, disableTombstoneCompactions, isActive, LOG_ALL_OPTION, logAll, ONLY_PURGE_REPAIRED_TOMBSTONES, TOMBSTONE_COMPACTION_INTERVAL_OPTION, TOMBSTONE_THRESHOLD_OPTION, tombstoneCompactionInterval, tombstoneThreshold, UNCHECKED_TOMBSTONE_COMPACTION_OPTION, uncheckedTombstoneCompaction

Constructor Summary

Constructors

Constructor	Description
TimeWindowCompactionStrategy(ColumnFamilyStore cfs, Map<String,String> options)

Method Summary

Modifier and Type	Method	Description
void	addSSTable(SSTableReader sstable)	Adds sstable, note that implementations must handle duplicate notifications here (added already being in the compaction strategy)
int	getEstimatedRemainingTasks()
Collection<AbstractCompactionTask>	getMaximalTask(long gcBefore, boolean splitOutput)
long	getMaxSSTableBytes()
AbstractCompactionTask	getNextBackgroundTask(long gcBefore)
Map<Long,Integer>	getSSTableCountByBuckets()
protected Set<SSTableReader>	getSSTables()	Returns the sstables managed by this strategy instance
AbstractCompactionTask	getUserDefinedTask(Collection<SSTableReader> sstables, long gcBefore)
static Pair<Long,Long>	getWindowBoundsInMillis(TimeUnit windowTimeUnit, int windowTimeSize, long timestampInMillis)	Find the lowest and highest timestamps in a given timestamp/unit pair Returns milliseconds, caller should adjust accordingly
Collection<Collection<SSTableReader>>	groupSSTablesForAntiCompaction(Collection<SSTableReader> sstablesToGroup)	TWCS should not group sstables for anticompaction - this can mix new and old data
void	removeSSTable(SSTableReader sstable)	Removes sstable from the strategy, implementations must be able to handle the sstable having already been removed.
String	toString()
static Map<String,String>	validateOptions(Map<String,String> options)

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

addSSTables, createSSTableMultiWriter, filterSuspectSSTables, getCompactionTask, getDirectories, getName, getScanners, getScanners, getScanners, metadataChanged, pause, removeSSTables, replaceSSTables, resume, shutdown, startup, strategyLogger, supportsEarlyOpen, worthDroppingTombstones

Methods inherited from class java.lang.Object

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

Field Details

estimatedRemainingTasks

protected volatile int estimatedRemainingTasks

Constructor Details

TimeWindowCompactionStrategy

public TimeWindowCompactionStrategy(ColumnFamilyStore cfs,
 Map<String,String> options)

Method Details

getNextBackgroundTask

public AbstractCompactionTask getNextBackgroundTask(long gcBefore)

Specified by:

getNextBackgroundTask in class AbstractCompactionStrategy

Parameters:

gcBefore - throw away tombstones older than this

Returns:

the next background/minor compaction task to run; null if nothing to do. Is responsible for marking its sstables as compaction-pending.

addSSTable

public void addSSTable(SSTableReader sstable)

Description copied from class: AbstractCompactionStrategy

Adds sstable, note that implementations must handle duplicate notifications here (added already being in the compaction strategy)

Specified by:

addSSTable in class AbstractCompactionStrategy

removeSSTable

public void removeSSTable(SSTableReader sstable)

Description copied from class: AbstractCompactionStrategy

Removes sstable from the strategy, implementations must be able to handle the sstable having already been removed.

Specified by:

removeSSTable in class AbstractCompactionStrategy

getSSTables

protected Set<SSTableReader> getSSTables()

Description copied from class: AbstractCompactionStrategy

Returns the sstables managed by this strategy instance

Specified by:

getSSTables in class AbstractCompactionStrategy

getWindowBoundsInMillis

public static Pair<Long,Long> getWindowBoundsInMillis(TimeUnit windowTimeUnit,
 int windowTimeSize,
 long timestampInMillis)

Find the lowest and highest timestamps in a given timestamp/unit pair Returns milliseconds, caller should adjust accordingly

getMaximalTask

public Collection<AbstractCompactionTask> getMaximalTask(long gcBefore,
 boolean splitOutput)

Specified by:

getMaximalTask in class AbstractCompactionStrategy

Parameters:

gcBefore - throw away tombstones older than this

Returns:

a compaction task that should be run to compact this columnfamilystore as much as possible. Null if nothing to do. Is responsible for marking its sstables as compaction-pending.

groupSSTablesForAntiCompaction

public Collection<Collection<SSTableReader>> groupSSTablesForAntiCompaction(Collection<SSTableReader> sstablesToGroup)

TWCS should not group sstables for anticompaction - this can mix new and old data

Overrides:

groupSSTablesForAntiCompaction in class AbstractCompactionStrategy

getUserDefinedTask

public AbstractCompactionTask getUserDefinedTask(Collection<SSTableReader> sstables,
 long gcBefore)

Specified by:

getUserDefinedTask in class AbstractCompactionStrategy

Parameters:

sstables - SSTables to compact. Must be marked as compacting.

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.) Is responsible for marking its sstables as compaction-pending.

getEstimatedRemainingTasks

public int getEstimatedRemainingTasks()

Specified by:

getEstimatedRemainingTasks in class AbstractCompactionStrategy

Returns:

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

getMaxSSTableBytes

public long getMaxSSTableBytes()

Specified by:

getMaxSSTableBytes in class AbstractCompactionStrategy

Returns:

size in bytes of the largest sstables for this strategy

getSSTableCountByBuckets

public Map<Long,Integer> getSSTableCountByBuckets()

validateOptions

public static Map<String,String> validateOptions(Map<String,String> options)
                                          throws ConfigurationException

Throws:

ConfigurationException

toString

public String toString()

Overrides:

toString in class Object