public long splitLogDistributed(final Path logDir) throws IOException {
    List<Path> logDirs = new ArrayList<>();
    logDirs.add(logDir);
    return splitLogDistributed(logDirs);
  }
@param logDir one region sever wal dir path in .logs
@throws IOException if there was an error while splitting any log file
@return cumulative size of the logfiles split
hbase-server/src/main/java/org/apache/hadoop/hbase/master/SplitLogManager.java