org.apache.cassandra.io.sstable

Class SSTableMetadata

java.lang.Object

org.apache.cassandra.io.sstable.SSTableMetadata

public class SSTableMetadata
extends java.lang.Object

Metadata for a SSTable. Metadata includes: - estimated row size histogram - estimated column count histogram - replay position - max column timestamp - max local deletion time - bloom filter fp chance - compression ratio - partitioner - generations of sstables from which this sstable was compacted, if any - tombstone drop time histogram An SSTableMetadata should be instantiated via the Collector, openFromDescriptor() or createDefaultInstance()

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SSTableMetadata.Collector
static class	SSTableMetadata.SSTableMetadataSerializer

Field Summary

Fields

Modifier and Type	Field and Description
double	bloomFilterFPChance
double	compressionRatio
EstimatedHistogram	estimatedColumnCount
EstimatedHistogram	estimatedRowSize
StreamingHistogram	estimatedTombstoneDropTime
java.util.List<java.nio.ByteBuffer>	maxColumnNames
int	maxLocalDeletionTime
long	maxTimestamp
java.util.List<java.nio.ByteBuffer>	minColumnNames
long	minTimestamp
static double	NO_BLOOM_FLITER_FP_CHANCE
static double	NO_COMPRESSION_RATIO
java.lang.String	partitioner
ReplayPosition	replayPosition
static SSTableMetadata.SSTableMetadataSerializer	serializer
int	sstableLevel

Method Summary

Methods

Modifier and Type	Method and Description
static SSTableMetadata	copyWithNewSSTableLevel(SSTableMetadata metadata, int sstableLevel) Deprecated.
static SSTableMetadata.Collector	createCollector(AbstractType<?> columnNameComparator)
static SSTableMetadata.Collector	createCollector(java.util.Collection<SSTableReader> sstables, AbstractType<?> columnNameComparator, int level)
double	getDroppableTombstonesBefore(int gcBefore) Get the amount of droppable tombstones
double	getEstimatedDroppableTombstoneRatio(int gcBefore)

Methods inherited from class java.lang.Object

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

Field Detail

NO_BLOOM_FLITER_FP_CHANCE

public static final double NO_BLOOM_FLITER_FP_CHANCE

See Also:

Constant Field Values

NO_COMPRESSION_RATIO

public static final double NO_COMPRESSION_RATIO

See Also:

Constant Field Values

serializer

public static final SSTableMetadata.SSTableMetadataSerializer serializer

estimatedRowSize

public final EstimatedHistogram estimatedRowSize

estimatedColumnCount

public final EstimatedHistogram estimatedColumnCount

replayPosition

public final ReplayPosition replayPosition

minTimestamp

public final long minTimestamp

maxTimestamp

public final long maxTimestamp

maxLocalDeletionTime

public final int maxLocalDeletionTime

bloomFilterFPChance

public final double bloomFilterFPChance

compressionRatio

public final double compressionRatio

partitioner

public final java.lang.String partitioner

estimatedTombstoneDropTime

public final StreamingHistogram estimatedTombstoneDropTime

sstableLevel

public final int sstableLevel

maxColumnNames

public final java.util.List<java.nio.ByteBuffer> maxColumnNames

minColumnNames

public final java.util.List<java.nio.ByteBuffer> minColumnNames

Method Detail

createCollector

public static SSTableMetadata.Collector createCollector(AbstractType<?> columnNameComparator)

createCollector

public static SSTableMetadata.Collector createCollector(java.util.Collection<SSTableReader> sstables,
                                        AbstractType<?> columnNameComparator,
                                        int level)

copyWithNewSSTableLevel

@Deprecated
public static SSTableMetadata copyWithNewSSTableLevel(SSTableMetadata metadata,
                                                 int sstableLevel)

Deprecated.

Used when updating sstablemetadata files with an sstable level

Parameters:

metadata -

sstableLevel -

Returns:

getEstimatedDroppableTombstoneRatio

public double getEstimatedDroppableTombstoneRatio(int gcBefore)

Parameters:

gcBefore -

Returns:

estimated droppable tombstone ratio at given gcBefore time.

getDroppableTombstonesBefore

public double getDroppableTombstonesBefore(int gcBefore)

Get the amount of droppable tombstones

Parameters:

gcBefore - the gc time

Returns:

amount of droppable tombstones