org.apache.lucene.index

Class IndexUpgrader

java.lang.Object

org.apache.lucene.index.IndexUpgrader

public final class IndexUpgrader
extends Object

This is an easy-to-use tool that upgrades all segments of an index from previous Lucene versions to the current segment file format. It can be used from command line:

  java -cp lucene-core.jar org.apache.lucene.index.IndexUpgrader [-delete-prior-commits] [-verbose] indexDir
 

Alternatively this class can be instantiated and upgrade() invoked. It uses UpgradeIndexMergePolicy and triggers the upgrade via an forceMerge request to IndexWriter.

This tool keeps only the last commit in an index; for this reason, if the incoming index has more than one commit, the tool refuses to run by default. Specify -delete-prior-commits to override this, allowing the tool to delete all but the last commit. From Java code this can be enabled by passing true to IndexUpgrader(Directory,InfoStream,boolean).

Warning: This tool may reorder documents if the index was partially upgraded before execution (e.g., documents were added). If your application relies on "monotonicity" of doc IDs (which means that the order in which the documents were added to the index is preserved), do a full forceMerge instead. The MergePolicy set by IndexWriterConfig may also reorder documents.

Constructor Summary

Constructors

Constructor and Description
IndexUpgrader(Directory dir) Creates index upgrader on the given directory, using an IndexWriter using the given matchVersion.
IndexUpgrader(Directory dir, IndexWriterConfig iwc, boolean deletePriorCommits) Creates index upgrader on the given directory, using an IndexWriter using the given config.
IndexUpgrader(Directory dir, InfoStream infoStream, boolean deletePriorCommits) Creates index upgrader on the given directory, using an IndexWriter using the given matchVersion.

Method Summary

Modifier and Type	Method and Description
static void	main(String[] args) Main method to run {code IndexUpgrader} from the command-line.
void	upgrade() Perform the upgrade.

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexUpgrader

public IndexUpgrader(Directory dir)

Creates index upgrader on the given directory, using an IndexWriter using the given matchVersion. The tool refuses to upgrade indexes with multiple commit points.

IndexUpgrader

public IndexUpgrader(Directory dir,
                     InfoStream infoStream,
                     boolean deletePriorCommits)

Creates index upgrader on the given directory, using an IndexWriter using the given matchVersion. You have the possibility to upgrade indexes with multiple commit points by removing all older ones. If infoStream is not null, all logging output will be sent to this stream.

IndexUpgrader

public IndexUpgrader(Directory dir,
                     IndexWriterConfig iwc,
                     boolean deletePriorCommits)

Creates index upgrader on the given directory, using an IndexWriter using the given config. You have the possibility to upgrade indexes with multiple commit points by removing all older ones.

Method Detail

main

public static void main(String[] args)
                 throws IOException

Main method to run {code IndexUpgrader} from the command-line.

Throws:

IOException

upgrade

public void upgrade()
             throws IOException

Perform the upgrade.

Throws:

IOException