Package org.apache.lucene.misc.index

Class IndexRearranger

java.lang.Object

org.apache.lucene.misc.index.IndexRearranger

public class IndexRearranger
extends Object

Copy and rearrange index according to document selectors, from input dir to output dir. Length of documentSelectors determines how many segments there will be

TODO: another possible (faster) approach to do this is to manipulate FlushPolicy and MergePolicy at indexing time to create small desired segments first and merge them accordingly for details please see: https://markmail.org/message/lbtdntclpnocmfuf

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	IndexRearranger.DocSelectorFilteredCodecReader
static interface	IndexRearranger.DocumentSelector	Select document within a CodecReader

Field Summary

Fields

Modifier and Type	Field	Description
protected final IndexWriterConfig	config
protected final List<IndexRearranger.DocumentSelector>	documentSelectors
protected final Directory	input
protected final Directory	output

Constructor Summary

Constructors

Constructor	Description
IndexRearranger(Directory input, Directory output, IndexWriterConfig config, List<IndexRearranger.DocumentSelector> documentSelectors)	Constructor

Method Summary

Modifier and Type	Method	Description
private static void	addOneSegment(IndexWriter writer, IndexReader reader, IndexRearranger.DocumentSelector selector)
void	execute()

Methods inherited from class java.lang.Object

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

Field Details

input

protected final Directory input

output

protected final Directory output

config

protected final IndexWriterConfig config

documentSelectors

protected final List<IndexRearranger.DocumentSelector> documentSelectors

Constructor Details

IndexRearranger

public IndexRearranger(Directory input,
 Directory output,
 IndexWriterConfig config,
 List<IndexRearranger.DocumentSelector> documentSelectors)

Constructor

Parameters:

input - input dir

output - output dir

config - index writer config

documentSelectors - specify what document is desired in the rearranged index segments, each selector correspond to one segment

Method Details

execute

public void execute()
             throws Exception

Throws:

Exception

addOneSegment

private static void addOneSegment(IndexWriter writer,
 IndexReader reader,
 IndexRearranger.DocumentSelector selector)
                           throws IOException

Throws:

IOException