Example usage for org.apache.lucene.index SegmentInfos getLastCommitSegmentsFileName

Introduction

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

Prototype

public static String getLastCommitSegmentsFileName(Directory directory) throws IOException 

Source Link

Document

Get the filename of the segments_N file for the most recent commit to the index in this Directory.

Usage

From source file:com.vmware.xenon.services.common.LuceneDocumentIndexService.java

License:Open Source License

private void upgradeIndex(Directory dir) throws IOException {
    boolean doUpgrade = false;

    String lastSegmentsFile = SegmentInfos.getLastCommitSegmentsFileName(dir.listAll());
    SegmentInfos sis = SegmentInfos.readCommit(dir, lastSegmentsFile);
    for (SegmentCommitInfo commit : sis) {
        if (!commit.info.getVersion().equals(Version.LATEST)) {
            logInfo("Found Index version %s", commit.info.getVersion().toString());
            doUpgrade = true;/*ww  w.j  a  v a2s  .  c om*/
            break;
        }
    }

    if (doUpgrade) {
        logInfo("Upgrading index to %s", Version.LATEST.toString());
        IndexWriterConfig iwc = new IndexWriterConfig(null);
        new IndexUpgrader(dir, iwc, false).upgrade();
        this.indexUpdateTimeMicros = Utils.getNowMicrosUtc();
    }
}

---

From source file:org.codelibs.elasticsearch.common.lucene.Lucene.java

License:Apache License

/**
 * This method removes all files from the given directory that are not referenced by the given segments file.
 * This method will open an IndexWriter and relies on index file deleter to remove all unreferenced files. Segment files
 * that are newer than the given segments file are removed forcefully to prevent problems with IndexWriter opening a potentially
 * broken commit point / leftover.//from  ww w  .ja  v a 2s .  c  om
 * <b>Note:</b> this method will fail if there is another IndexWriter open on the given directory. This method will also acquire
 * a write lock from the directory while pruning unused files. This method expects an existing index in the given directory that has
 * the given segments file.
 */
public static SegmentInfos pruneUnreferencedFiles(String segmentsFileName, Directory directory)
        throws IOException {
    final SegmentInfos si = readSegmentInfos(segmentsFileName, directory);
    try (Lock writeLock = directory.obtainLock(IndexWriter.WRITE_LOCK_NAME)) {
        int foundSegmentFiles = 0;
        for (final String file : directory.listAll()) {
            /**
             * we could also use a deletion policy here but in the case of snapshot and restore
             * sometimes we restore an index and override files that were referenced by a "future"
             * commit. If such a commit is opened by the IW it would likely throw a corrupted index exception
             * since checksums don's match anymore. that's why we prune the name here directly.
             * We also want the caller to know if we were not able to remove a segments_N file.
             */
            if (file.startsWith(IndexFileNames.SEGMENTS) || file.equals(IndexFileNames.OLD_SEGMENTS_GEN)) {
                foundSegmentFiles++;
                if (file.equals(si.getSegmentsFileName()) == false) {
                    directory.deleteFile(file); // remove all segment_N files except of the one we wanna keep
                }
            }
        }
        assert SegmentInfos.getLastCommitSegmentsFileName(directory).equals(segmentsFileName);
        if (foundSegmentFiles == 0) {
            throw new IllegalStateException("no commit found in the directory");
        }
    }
    final CommitPoint cp = new CommitPoint(si, directory);
    try (IndexWriter writer = new IndexWriter(directory,
            new IndexWriterConfig(Lucene.STANDARD_ANALYZER).setIndexCommit(cp).setCommitOnClose(false)
                    .setMergePolicy(NoMergePolicy.INSTANCE).setOpenMode(IndexWriterConfig.OpenMode.APPEND))) {
        // do nothing and close this will kick of IndexFileDeleter which will remove all pending files
    }
    return si;
}

---