Package org.apache.lucene.index
Class IndexUpgrader
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- org.apache.lucene.index.IndexUpgrader
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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 andupgrade()invoked. It usesUpgradeIndexMergePolicyand triggers the upgrade via an forceMerge request toIndexWriter.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-commitsto override this, allowing the tool to delete all but the last commit. From Java code this can be enabled by passingtruetoIndexUpgrader(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
MergePolicyset byIndexWriterConfigmay also reorder documents.
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Constructor Summary
Constructors Constructor Description IndexUpgrader(Directory dir)Creates index upgrader on the given directory, using anIndexWriterusing the givenmatchVersion.IndexUpgrader(Directory dir, IndexWriterConfig iwc, boolean deletePriorCommits)Creates index upgrader on the given directory, using anIndexWriterusing the given config.IndexUpgrader(Directory dir, InfoStream infoStream, boolean deletePriorCommits)Creates index upgrader on the given directory, using anIndexWriterusing the givenmatchVersion.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description static voidmain(String[] args)Main method to run {code IndexUpgrader} from the command-line.voidupgrade()Perform the upgrade.
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Constructor Detail
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IndexUpgrader
public IndexUpgrader(Directory dir)
Creates index upgrader on the given directory, using anIndexWriterusing the givenmatchVersion. The tool refuses to upgrade indexes with multiple commit points.
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IndexUpgrader
public IndexUpgrader(Directory dir, InfoStream infoStream, boolean deletePriorCommits)
Creates index upgrader on the given directory, using anIndexWriterusing the givenmatchVersion. You have the possibility to upgrade indexes with multiple commit points by removing all older ones. IfinfoStreamis notnull, all logging output will be sent to this stream.
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IndexUpgrader
public IndexUpgrader(Directory dir, IndexWriterConfig iwc, boolean deletePriorCommits)
Creates index upgrader on the given directory, using anIndexWriterusing the given config. You have the possibility to upgrade indexes with multiple commit points by removing all older ones.
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Method Detail
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main
public static void main(String[] args) throws IOException
Main method to run {code IndexUpgrader} from the command-line.- Throws:
IOException
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upgrade
public void upgrade() throws IOExceptionPerform the upgrade.- Throws:
IOException
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