Example usage for org.apache.lucene.index UpgradeIndexMergePolicy UpgradeIndexMergePolicy

Introduction

In this page you can find the example usage for org.apache.lucene.index UpgradeIndexMergePolicy UpgradeIndexMergePolicy.

Prototype

public UpgradeIndexMergePolicy(MergePolicy in) 

Source Link

Document

Wrap the given MergePolicy and intercept forceMerge requests to only upgrade segments written with previous Lucene versions.

Usage

From source file:org.apache.jackrabbit.core.query.lucene.IndexMigration.java

License:Apache License

/**
 * Checks if the given <code>index</code> needs to be migrated.
 *
 * @param index the index to check and migration if needed.
 * @param directoryManager the directory manager.
 * @param oldSeparatorChar the old separator char that needs to be replaced.
 * @throws IOException if an error occurs while migrating the index.
 *///w  ww.j  av a2  s  .  com
public static void migrate(PersistentIndex index, DirectoryManager directoryManager, char oldSeparatorChar)
        throws IOException {
    Directory indexDir = index.getDirectory();
    log.debug("Checking {} ...", indexDir);
    ReadOnlyIndexReader reader = index.getReadOnlyIndexReader();
    try {
        if (IndexFormatVersion.getVersion(reader).getVersion() >= IndexFormatVersion.V3.getVersion()) {
            // index was created with Jackrabbit 1.5 or higher
            // no need for migration
            log.debug("IndexFormatVersion >= V3, no migration needed");
            return;
        }
        // assert: there is at least one node in the index, otherwise the
        //         index format version would be at least V3
        TermEnum terms = reader.terms(new Term(FieldNames.PROPERTIES, ""));
        try {
            Term t = terms.term();
            if (t.text().indexOf(oldSeparatorChar) == -1) {
                log.debug("Index already migrated");
                return;
            }
        } finally {
            terms.close();
        }
    } finally {
        reader.release();
        index.releaseWriterAndReaders();
    }

    // if we get here then the index must be migrated
    log.debug("Index requires migration {}", indexDir);

    String migrationName = index.getName() + "_v36";
    if (directoryManager.hasDirectory(migrationName)) {
        directoryManager.delete(migrationName);
    }

    Directory migrationDir = directoryManager.getDirectory(migrationName);
    final IndexWriterConfig c = new IndexWriterConfig(Version.LUCENE_36, new JackrabbitAnalyzer());
    c.setMergePolicy(new UpgradeIndexMergePolicy(new LogByteSizeMergePolicy()));
    c.setIndexDeletionPolicy(new KeepOnlyLastCommitDeletionPolicy());
    try {
        IndexWriter writer = new IndexWriter(migrationDir, c);
        try {
            IndexReader r = new MigrationIndexReader(IndexReader.open(index.getDirectory()), oldSeparatorChar);
            try {
                writer.addIndexes(r);
                writer.forceMerge(1);
                writer.close();
            } finally {
                r.close();
            }
        } finally {
            writer.close();
        }
    } finally {
        migrationDir.close();
    }
    directoryManager.delete(index.getName());
    if (!directoryManager.rename(migrationName, index.getName())) {
        throw new IOException("failed to move migrated directory " + migrationDir);
    }
    log.info("Migrated " + index.getName());
}

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From source file:org.apache.solr.index.UpgradeIndexMergePolicyFactory.java

License:Apache License

@Override
protected MergePolicy getMergePolicyInstance(MergePolicy wrappedMP) {
    final MergePolicy mp = new UpgradeIndexMergePolicy(wrappedMP);
    return mp;//from  w w w . j av  a 2  s .  c  om
}

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