org.apache.cassandra.io.sstable.metadata

Class MetadataCollector

java.lang.Object

org.apache.cassandra.io.sstable.metadata.MetadataCollector

public class MetadataCollector
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.Set<java.lang.Integer>	ancestors
protected com.clearspring.analytics.stream.cardinality.ICardinality	cardinality Default cardinality estimation method is to use HyperLogLog++.
protected double	compressionRatio
protected EstimatedHistogram	estimatedColumnCount
protected EstimatedHistogram	estimatedRowSize
protected StreamingHistogram	estimatedTombstoneDropTime
protected java.util.List<java.nio.ByteBuffer>	maxColumnNames
protected int	maxLocalDeletionTime
protected long	maxTimestamp
protected java.util.List<java.nio.ByteBuffer>	minColumnNames
protected long	minTimestamp
static double	NO_COMPRESSION_RATIO
protected ReplayPosition	replayPosition
protected int	sstableLevel

Constructor Summary

Constructors

Constructor and Description
MetadataCollector(CellNameType columnNameComparator)
MetadataCollector(java.util.Collection<SSTableReader> sstables, CellNameType columnNameComparator, int level)

Method Summary

Methods

Modifier and Type	Method and Description
MetadataCollector	addAncestor(int generation)
void	addColumnCount(long columnCount)
void	addCompressionRatio(long compressed, long uncompressed) Ratio is compressed/uncompressed and it is if you have 1.x then compression isn't helping
void	addKey(java.nio.ByteBuffer key)
void	addRowSize(long rowSize)
static StatsMetadata	defaultStatsMetadata()
MetadataCollector	estimatedColumnCount(EstimatedHistogram estimatedColumnCount)
MetadataCollector	estimatedRowSize(EstimatedHistogram estimatedRowSize)
java.util.Map<MetadataType,MetadataComponent>	finalizeMetadata(java.lang.String partitioner, double bloomFilterFPChance, long repairedAt)
void	mergeTombstoneHistogram(StreamingHistogram histogram)
MetadataCollector	replayPosition(ReplayPosition replayPosition)
MetadataCollector	sstableLevel(int sstableLevel)
void	update(long size, ColumnStats stats)
MetadataCollector	updateMaxColumnNames(java.util.List<java.nio.ByteBuffer> maxColumnNames)
void	updateMaxLocalDeletionTime(int maxLocalDeletionTime)
void	updateMaxTimestamp(long potentialMax)
MetadataCollector	updateMinColumnNames(java.util.List<java.nio.ByteBuffer> minColumnNames)
void	updateMinTimestamp(long potentialMin)

Methods inherited from class java.lang.Object

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

Field Detail

NO_COMPRESSION_RATIO

public static final double NO_COMPRESSION_RATIO

See Also:

Constant Field Values

estimatedRowSize

protected EstimatedHistogram estimatedRowSize

estimatedColumnCount

protected EstimatedHistogram estimatedColumnCount

replayPosition

protected ReplayPosition replayPosition

minTimestamp

protected long minTimestamp

maxTimestamp

protected long maxTimestamp

maxLocalDeletionTime

protected int maxLocalDeletionTime

compressionRatio

protected double compressionRatio

ancestors

protected java.util.Set<java.lang.Integer> ancestors

estimatedTombstoneDropTime

protected StreamingHistogram estimatedTombstoneDropTime

sstableLevel

protected int sstableLevel

minColumnNames

protected java.util.List<java.nio.ByteBuffer> minColumnNames

maxColumnNames

protected java.util.List<java.nio.ByteBuffer> maxColumnNames

cardinality

protected com.clearspring.analytics.stream.cardinality.ICardinality cardinality

Default cardinality estimation method is to use HyperLogLog++. Parameter here(p=13, sp=25) should give reasonable estimation while lowering bytes required to hold information. See CASSANDRA-5906 for detail.

Constructor Detail

MetadataCollector

public MetadataCollector(CellNameType columnNameComparator)

MetadataCollector

public MetadataCollector(java.util.Collection<SSTableReader> sstables,
                 CellNameType columnNameComparator,
                 int level)

Method Detail

defaultStatsMetadata

public static StatsMetadata defaultStatsMetadata()

addKey

public void addKey(java.nio.ByteBuffer key)

addRowSize

public void addRowSize(long rowSize)

addColumnCount

public void addColumnCount(long columnCount)

mergeTombstoneHistogram

public void mergeTombstoneHistogram(StreamingHistogram histogram)

addCompressionRatio

public void addCompressionRatio(long compressed,
                       long uncompressed)

Ratio is compressed/uncompressed and it is if you have 1.x then compression isn't helping

updateMinTimestamp

public void updateMinTimestamp(long potentialMin)

updateMaxTimestamp

public void updateMaxTimestamp(long potentialMax)

updateMaxLocalDeletionTime

public void updateMaxLocalDeletionTime(int maxLocalDeletionTime)

estimatedRowSize

public MetadataCollector estimatedRowSize(EstimatedHistogram estimatedRowSize)

estimatedColumnCount

public MetadataCollector estimatedColumnCount(EstimatedHistogram estimatedColumnCount)

replayPosition

public MetadataCollector replayPosition(ReplayPosition replayPosition)

addAncestor

public MetadataCollector addAncestor(int generation)

update

public void update(long size,
          ColumnStats stats)

sstableLevel

public MetadataCollector sstableLevel(int sstableLevel)

updateMinColumnNames

public MetadataCollector updateMinColumnNames(java.util.List<java.nio.ByteBuffer> minColumnNames)

updateMaxColumnNames

public MetadataCollector updateMaxColumnNames(java.util.List<java.nio.ByteBuffer> maxColumnNames)

finalizeMetadata

public java.util.Map<MetadataType,MetadataComponent> finalizeMetadata(java.lang.String partitioner,
                                                             double bloomFilterFPChance,
                                                             long repairedAt)