org.apache.cassandra.db

Class CounterColumn

java.lang.Object

org.apache.cassandra.db.Column

org.apache.cassandra.db.CounterColumn

All Implemented Interfaces:

OnDiskAtom

public class CounterColumn
extends Column

A column that represents a partitioned counter.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.db.OnDiskAtom

OnDiskAtom.Serializer

Field Summary

Fields

Modifier and Type	Field and Description
protected static CounterContext	contextManager

Fields inherited from class org.apache.cassandra.db.Column

MAX_NAME_LENGTH, name, serializer, timestamp, value

Constructor Summary

Constructors

Constructor and Description
CounterColumn(java.nio.ByteBuffer name, java.nio.ByteBuffer value, long timestamp)
CounterColumn(java.nio.ByteBuffer name, java.nio.ByteBuffer value, long timestamp, long timestampOfLastDelete)
CounterColumn(java.nio.ByteBuffer name, long value, long timestamp)
CounterColumn(java.nio.ByteBuffer name, long value, long timestamp, long timestampOfLastDelete)

Method Summary

Methods

Modifier and Type	Method and Description
static CounterColumn	create(java.nio.ByteBuffer name, java.nio.ByteBuffer value, long timestamp, long timestampOfLastDelete, ColumnSerializer.Flag flag)
int	dataSize()
Column	diff(Column column)
boolean	equals(java.lang.Object o)
java.lang.String	getString(AbstractType<?> comparator)
boolean	hasCounterId(CounterId id) Check if a given counterId is found in this CounterColumn context.
int	hashCode()
Column	localCopy(ColumnFamilyStore cfs)
Column	localCopy(ColumnFamilyStore cfs, Allocator allocator)
Column	markDeltaToBeCleared()
static void	mergeAndRemoveOldShards(DecoratedKey key, ColumnFamily cf, int gcBefore, int mergeBefore)
static void	mergeAndRemoveOldShards(DecoratedKey key, ColumnFamily cf, int gcBefore, int mergeBefore, boolean sendToOtherReplica) There is two phase to the removal of old shards.
Column	reconcile(Column column, Allocator allocator)
int	serializationFlags()
int	serializedSize(TypeSizes typeSizes)
long	timestampOfLastDelete()
long	total()
void	updateDigest(java.security.MessageDigest digest)
void	validateFields(CFMetaData metadata)
Column	withUpdatedName(java.nio.ByteBuffer newName)

Methods inherited from class org.apache.cassandra.db.Column

create, create, create, create, create, create, create, getLocalDeletionTime, getMarkedForDeleteAt, hasIrrelevantData, isLive, isMarkedForDelete, maxTimestamp, minTimestamp, name, onDiskIterator, onDiskSerializer, reconcile, serializedSizeForSSTable, timestamp, validateName, value, withUpdatedTimestamp

Methods inherited from class java.lang.Object

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

Field Detail

contextManager

protected static final CounterContext contextManager

Constructor Detail

CounterColumn

public CounterColumn(java.nio.ByteBuffer name,
             long value,
             long timestamp)

CounterColumn

public CounterColumn(java.nio.ByteBuffer name,
             long value,
             long timestamp,
             long timestampOfLastDelete)

CounterColumn

public CounterColumn(java.nio.ByteBuffer name,
             java.nio.ByteBuffer value,
             long timestamp)

CounterColumn

public CounterColumn(java.nio.ByteBuffer name,
             java.nio.ByteBuffer value,
             long timestamp,
             long timestampOfLastDelete)

Method Detail

create

public static CounterColumn create(java.nio.ByteBuffer name,
                   java.nio.ByteBuffer value,
                   long timestamp,
                   long timestampOfLastDelete,
                   ColumnSerializer.Flag flag)

withUpdatedName

public Column withUpdatedName(java.nio.ByteBuffer newName)

Overrides:

withUpdatedName in class Column

timestampOfLastDelete

public long timestampOfLastDelete()

total

public long total()

dataSize

public int dataSize()

Overrides:

dataSize in class Column

serializedSize

public int serializedSize(TypeSizes typeSizes)

Specified by:

serializedSize in interface OnDiskAtom

Overrides:

serializedSize in class Column

diff

public Column diff(Column column)

Overrides:

diff in class Column

updateDigest

public void updateDigest(java.security.MessageDigest digest)

Specified by:

updateDigest in interface OnDiskAtom

Overrides:

updateDigest in class Column

reconcile

public Column reconcile(Column column,
               Allocator allocator)

Overrides:

reconcile in class Column

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class Column

hashCode

public int hashCode()

Overrides:

hashCode in class Column

localCopy

public Column localCopy(ColumnFamilyStore cfs)

Overrides:

localCopy in class Column

localCopy

public Column localCopy(ColumnFamilyStore cfs,
               Allocator allocator)

Overrides:

localCopy in class Column

getString

public java.lang.String getString(AbstractType<?> comparator)

Overrides:

getString in class Column

serializationFlags

public int serializationFlags()

Overrides:

serializationFlags in class Column

validateFields

public void validateFields(CFMetaData metadata)
                    throws MarshalException

Specified by:

validateFields in interface OnDiskAtom

Overrides:

validateFields in class Column

Throws:

MarshalException

hasCounterId

public boolean hasCounterId(CounterId id)

Check if a given counterId is found in this CounterColumn context.

mergeAndRemoveOldShards

public static void mergeAndRemoveOldShards(DecoratedKey key,
                           ColumnFamily cf,
                           int gcBefore,
                           int mergeBefore)

mergeAndRemoveOldShards

public static void mergeAndRemoveOldShards(DecoratedKey key,
                           ColumnFamily cf,
                           int gcBefore,
                           int mergeBefore,
                           boolean sendToOtherReplica)

There is two phase to the removal of old shards. First phase: we merge the old shard value to the current shard and 'nulify' the old one. We then send the counter context with the old shard nulified to all other replica. Second phase: once an old shard has been nulified for longer than gc_grace (to be sure all other replica had been aware of the merge), we simply remove that old shard from the context (it's value is 0). This method does both phases. (Note that the sendToOtherReplica flag is here only to facilitate testing. It should be true in real code so use the method above preferably)

markDeltaToBeCleared

public Column markDeltaToBeCleared()