private WALStreamReader getReader(Path curLogFile, CancelableProgressable reporter)
    throws IOException {
    return walFactory.createStreamReader(walFS, curLogFile, reporter);
  }
Create a new {@link WALStreamReader} for reading logs to split.
@return new Reader instance, caller should close
hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALSplitter.java