private void completeManifest() throws IOException {
    Path tempManifestPath = new Path(destPath, TMP_MANIFEST_FILE_NAME);
    Path manifestPath = new Path(destPath, MANIFEST_FILE_NAME);
    FileSystem fs = tempManifestPath.getFileSystem(getConf());
    fs.rename(tempManifestPath, manifestPath);
  }
Get the current hash
@return the current hash or null if there is no current hash
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/HashTable.java