Class IndexUpgrader

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 Lucene.Net.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(Int32) 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 .NET code this can be enabled by passing true to IndexUpgrader(Directory, LuceneVersion, TextWriter, 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.

Inheritance

System.Object

IndexUpgrader

Namespace: Lucene.Net.Index

Assembly: Lucene.Net.dll

Syntax

public sealed class IndexUpgrader : object

Constructors

IndexUpgrader(Directory, IndexWriterConfig, Boolean)

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.

Declaration

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

Parameters

Type	Name	Description
Directory	dir
IndexWriterConfig	iwc
System.Boolean	deletePriorCommits

IndexUpgrader(Directory, LuceneVersion)

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

Declaration

public IndexUpgrader(Directory dir, LuceneVersion matchVersion)

Parameters

Type	Name	Description
Directory	dir
LuceneVersion	matchVersion

IndexUpgrader(Directory, LuceneVersion, TextWriter, Boolean)

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.

Declaration

public IndexUpgrader(Directory dir, LuceneVersion matchVersion, TextWriter infoStream, bool deletePriorCommits)

Parameters

Type	Name	Description
Directory	dir
LuceneVersion	matchVersion
TextWriter	infoStream
System.Boolean	deletePriorCommits

Methods

Main(String[])

Main method to run IndexUpgrader from the command-line.

Declaration

public static void Main(string[] args)

Parameters

Type	Name	Description
System.String[]	args

ParseArgs(String[])

Declaration

public static IndexUpgrader ParseArgs(string[] args)

Parameters

Type	Name	Description
System.String[]	args

Returns

Type	Description
IndexUpgrader

Upgrade()

Perform the upgrade.

Declaration

public void Upgrade()