示例#1
0
  final void finishCommit(Directory dir) throws IOException {
    if (pendingSegnOutput == null) throw new IllegalStateException("prepareCommit was not called");
    boolean success = false;
    try {
      pendingSegnOutput.finishCommit();
      pendingSegnOutput.close();
      pendingSegnOutput = null;
      success = true;
    } finally {
      if (!success) rollbackCommit(dir);
    }

    // NOTE: if we crash here, we have left a segments_N
    // file in the directory in a possibly corrupt state (if
    // some bytes made it to stable storage and others
    // didn't).  But, the segments_N file includes checksum
    // at the end, which should catch this case.  So when a
    // reader tries to read it, it will throw a
    // CorruptIndexException, which should cause the retry
    // logic in SegmentInfos to kick in and load the last
    // good (previous) segments_N-1 file.

    final String fileName =
        IndexFileNames.fileNameFromGeneration(IndexFileNames.SEGMENTS, "", generation);
    success = false;
    try {
      dir.sync(Collections.singleton(fileName));
      success = true;
    } finally {
      if (!success) {
        try {
          dir.deleteFile(fileName);
        } catch (Throwable t) {
          // Suppress so we keep throwing the original exception
        }
      }
    }

    lastGeneration = generation;

    try {
      IndexOutput genOutput = dir.createOutput(IndexFileNames.SEGMENTS_GEN);
      try {
        genOutput.writeInt(FORMAT_LOCKLESS);
        genOutput.writeLong(generation);
        genOutput.writeLong(generation);
      } finally {
        genOutput.close();
      }
    } catch (ThreadInterruptedException t) {
      throw t;
    } catch (Throwable t) {
      // It's OK if we fail to write this file since it's
      // used only as one of the retry fallbacks.
    }
  }
示例#2
0
 @Override
 public void sync(Collection<String> names) throws IOException {
   fsDir.sync(names);
 }
示例#3
0
  /**
   * Commit changes resulting from delete, undeleteAll, or setNorm operations
   *
   * <p>If an exception is hit, then either no changes or all changes will have been committed to
   * the index (transactional semantics).
   *
   * @throws IOException if there is a low-level IO error
   */
  @Override
  protected void doCommit(Map<String, String> commitUserData) throws IOException {
    if (hasChanges) {
      segmentInfos.setUserData(commitUserData);
      // Default deleter (for backwards compatibility) is
      // KeepOnlyLastCommitDeleter:
      IndexFileDeleter deleter =
          new IndexFileDeleter(
              directory,
              deletionPolicy == null ? new KeepOnlyLastCommitDeletionPolicy() : deletionPolicy,
              segmentInfos,
              null,
              null);
      segmentInfos.updateGeneration(deleter.getLastSegmentInfos());
      segmentInfos.changed();

      // Checkpoint the state we are about to change, in
      // case we have to roll back:
      startCommit();

      final List<SegmentInfo> rollbackSegments = segmentInfos.createBackupSegmentInfos(false);

      boolean success = false;
      try {
        for (int i = 0; i < subReaders.length; i++) subReaders[i].commit();

        // Remove segments that contain only 100% deleted
        // docs:
        segmentInfos.pruneDeletedSegments();

        // Sync all files we just wrote
        directory.sync(segmentInfos.files(directory, false));
        segmentInfos.commit(directory);
        success = true;
      } finally {

        if (!success) {

          // Rollback changes that were made to
          // SegmentInfos but failed to get [fully]
          // committed.  This way this reader instance
          // remains consistent (matched to what's
          // actually in the index):
          rollbackCommit();

          // Recompute deletable files & remove them (so
          // partially written .del files, etc, are
          // removed):
          deleter.refresh();

          // Restore all SegmentInfos (in case we pruned some)
          segmentInfos.rollbackSegmentInfos(rollbackSegments);
        }
      }

      // Have the deleter remove any now unreferenced
      // files due to this commit:
      deleter.checkpoint(segmentInfos, true);
      deleter.close();

      maxIndexVersion = segmentInfos.getVersion();

      if (writeLock != null) {
        writeLock.release(); // release write lock
        writeLock = null;
      }
    }
    hasChanges = false;
  }
  private void write(Directory directory) throws IOException {

    long nextGeneration = getNextPendingGeneration();
    String segmentFileName =
        IndexFileNames.fileNameFromGeneration(IndexFileNames.PENDING_SEGMENTS, "", nextGeneration);

    // Always advance the generation on write:
    generation = nextGeneration;

    IndexOutput segnOutput = null;
    boolean success = false;

    try {
      segnOutput = directory.createOutput(segmentFileName, IOContext.DEFAULT);
      CodecUtil.writeIndexHeader(
          segnOutput,
          "segments",
          VERSION_CURRENT,
          StringHelper.randomId(),
          Long.toString(nextGeneration, Character.MAX_RADIX));
      segnOutput.writeVInt(Version.LATEST.major);
      segnOutput.writeVInt(Version.LATEST.minor);
      segnOutput.writeVInt(Version.LATEST.bugfix);

      segnOutput.writeLong(version);
      segnOutput.writeInt(counter); // write counter
      segnOutput.writeInt(size());

      if (size() > 0) {

        Version minSegmentVersion = null;

        // We do a separate loop up front so we can write the minSegmentVersion before
        // any SegmentInfo; this makes it cleaner to throw IndexFormatTooOldExc at read time:
        for (SegmentCommitInfo siPerCommit : this) {
          Version segmentVersion = siPerCommit.info.getVersion();
          if (minSegmentVersion == null || segmentVersion.onOrAfter(minSegmentVersion) == false) {
            minSegmentVersion = segmentVersion;
          }
        }

        segnOutput.writeVInt(minSegmentVersion.major);
        segnOutput.writeVInt(minSegmentVersion.minor);
        segnOutput.writeVInt(minSegmentVersion.bugfix);
      }

      // write infos
      for (SegmentCommitInfo siPerCommit : this) {
        SegmentInfo si = siPerCommit.info;
        segnOutput.writeString(si.name);
        byte segmentID[] = si.getId();
        // TODO: remove this in lucene 6, we don't need to include 4.x segments in commits anymore
        if (segmentID == null) {
          segnOutput.writeByte((byte) 0);
        } else {
          if (segmentID.length != StringHelper.ID_LENGTH) {
            throw new IllegalStateException(
                "cannot write segment: invalid id segment="
                    + si.name
                    + "id="
                    + StringHelper.idToString(segmentID));
          }
          segnOutput.writeByte((byte) 1);
          segnOutput.writeBytes(segmentID, segmentID.length);
        }
        segnOutput.writeString(si.getCodec().getName());
        segnOutput.writeLong(siPerCommit.getDelGen());
        int delCount = siPerCommit.getDelCount();
        if (delCount < 0 || delCount > si.maxDoc()) {
          throw new IllegalStateException(
              "cannot write segment: invalid maxDoc segment="
                  + si.name
                  + " maxDoc="
                  + si.maxDoc()
                  + " delCount="
                  + delCount);
        }
        segnOutput.writeInt(delCount);
        segnOutput.writeLong(siPerCommit.getFieldInfosGen());
        segnOutput.writeLong(siPerCommit.getDocValuesGen());
        segnOutput.writeSetOfStrings(siPerCommit.getFieldInfosFiles());
        final Map<Integer, Set<String>> dvUpdatesFiles = siPerCommit.getDocValuesUpdatesFiles();
        segnOutput.writeInt(dvUpdatesFiles.size());
        for (Entry<Integer, Set<String>> e : dvUpdatesFiles.entrySet()) {
          segnOutput.writeInt(e.getKey());
          segnOutput.writeSetOfStrings(e.getValue());
        }
      }
      segnOutput.writeMapOfStrings(userData);
      CodecUtil.writeFooter(segnOutput);
      segnOutput.close();
      directory.sync(Collections.singleton(segmentFileName));
      success = true;
    } finally {
      if (success) {
        pendingCommit = true;
      } else {
        // We hit an exception above; try to close the file
        // but suppress any exception:
        IOUtils.closeWhileHandlingException(segnOutput);
        // Try not to leave a truncated segments_N file in
        // the index:
        IOUtils.deleteFilesIgnoringExceptions(directory, segmentFileName);
      }
    }
  }