public WALStreamReader createStreamReader(FileSystem fs, Path path,
    CancelableProgressable reporter) throws IOException {
    return createStreamReader(fs, path, reporter, -1);
  }
Create a one-way stream reader for the WAL.
@return A WAL reader. Close when done with it.
hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALFactory.java