org.apache.cassandra.db
Class ColumnIndexer

java.lang.Object
  org.apache.cassandra.db.ColumnIndexer

public class ColumnIndexer
extends java.lang.Object

Help to create an index for a column family based on size of columns

Nested Class Summary

static class

ColumnIndexer.RowHeader Holds information about serialized index and bloom filter

Constructor Summary

ColumnIndexer()

Method Summary

static void	serialize(ColumnIndexer.RowHeader indexInfo, java.io.DataOutput dos)
static ColumnIndexer.RowHeader	serialize(IIterableColumns columns) Serializes the index into in-memory structure with all required components such as Bloom Filter, index block size, IndexInfo list
static void	serialize(IIterableColumns columns, java.io.DataOutput dos) Given a column family this, function creates an in-memory structure that represents the column index for the column family, and subsequently writes it to disk.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnIndexer

public ColumnIndexer()

Method Detail

serialize

public static void serialize(IIterableColumns columns,
                             java.io.DataOutput dos)

Given a column family this, function creates an in-memory structure that represents the column index for the column family, and subsequently writes it to disk.

Parameters:

columns - Column family to create index for

dos - data output stream

serialize

public static void serialize(ColumnIndexer.RowHeader indexInfo,
                             java.io.DataOutput dos)

serialize

public static ColumnIndexer.RowHeader serialize(IIterableColumns columns)

Serializes the index into in-memory structure with all required components such as Bloom Filter, index block size, IndexInfo list

Parameters:

columns - Column family to create index for

Returns:

information about index - it's Bloom Filter, block size and IndexInfo list