Examples with UpgradeIndexMergePolicy org.apache.lucene.index.UpgradeIndexMergePolicy used on opensource projects

Example 1 with UpgradeIndexMergePolicy

use of org.apache.lucene.index.UpgradeIndexMergePolicy in project jackrabbit by apache.

the class IndexMigration method migrate.

/**
 * 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.
 */
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());
}