Package org.apache.cassandra.index.sai.disk.v1

Class WidePrimaryKeyMap

java.lang.Object

org.apache.cassandra.index.sai.disk.v1.SkinnyPrimaryKeyMap

org.apache.cassandra.index.sai.disk.v1.WidePrimaryKeyMap

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, PrimaryKeyMap

@NotThreadSafe
public class WidePrimaryKeyMap
extends SkinnyPrimaryKeyMap

An extension of the SkinnyPrimaryKeyMap for wide tables (those with clustering columns).

This used the following additional on-disk structures to the SkinnyPrimaryKeyMap

• A block-packed structure for partitionId to partition size (number of rows in the partition) lookups using BlockPackedReader. Uses the IndexComponent.PARTITION_TO_SIZE component
• A key store for rowId to Clustering and Clustering to rowId lookups using KeyLookup. Uses the IndexComponent.CLUSTERING_KEY_BLOCKS and IndexComponent.CLUSTERING_KEY_BLOCK_OFFSETS components

While the WidePrimaryKeyMap.Factory is threadsafe, individual instances of the WidePrimaryKeyMap are not.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	WidePrimaryKeyMap.Factory

Field Summary

Fields inherited from class org.apache.cassandra.index.sai.disk.v1.SkinnyPrimaryKeyMap

partitionKeyCursor, primaryKeyFactory, rowIdToPartitionIdArray, rowIdToTokenArray

Method Summary

Modifier and Type	Method	Description
void	close()
long	floor(Token token)	Returns the last row ID of the nearest Token less than or equal to the given Token, or a negative value if the Token is at its minimum value
PrimaryKey	primaryKeyFromRowId(long sstableRowId)	Returns a PrimaryKey for a row ID
long	rowIdFromPrimaryKey(PrimaryKey primaryKey)	Returns a row ID for a PrimaryKey

Methods inherited from class org.apache.cassandra.index.sai.disk.v1.SkinnyPrimaryKeyMap

ceiling, readPartitionKey, tokenCollisionDetection

Methods inherited from class java.lang.Object

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

Method Detail

primaryKeyFromRowId

public PrimaryKey primaryKeyFromRowId(long sstableRowId)

Description copied from interface: PrimaryKeyMap

Returns a PrimaryKey for a row ID

Specified by:

primaryKeyFromRowId in interface PrimaryKeyMap

Overrides:

primaryKeyFromRowId in class SkinnyPrimaryKeyMap

Parameters:

sstableRowId - the row ID to lookup

Returns:

the PrimaryKey associated with the row ID

rowIdFromPrimaryKey

public long rowIdFromPrimaryKey(PrimaryKey primaryKey)

Description copied from interface: PrimaryKeyMap

Returns a row ID for a PrimaryKey

Specified by:

rowIdFromPrimaryKey in interface PrimaryKeyMap

Overrides:

rowIdFromPrimaryKey in class SkinnyPrimaryKeyMap

Parameters:

primaryKey - the PrimaryKey to lookup

Returns:

the row ID associated with the PrimaryKey

floor

public long floor(Token token)

Description copied from interface: PrimaryKeyMap

Returns the last row ID of the nearest Token less than or equal to the given Token, or a negative value if the Token is at its minimum value

Specified by:

floor in interface PrimaryKeyMap

Overrides:

floor in class SkinnyPrimaryKeyMap

Parameters:

token - the Token to lookup

Returns:

the floor row ID associated with the Token

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface PrimaryKeyMap

Overrides:

close in class SkinnyPrimaryKeyMap