@Override
  public List<InputSplit> getSplits(JobContext context) throws IOException, InterruptedException {
    return getSplits(context, START_TIME_KEY, END_TIME_KEY);
  }
handler for non-deprecated WALKey version. fold into WALRecordReader once we no longer need to
support HLogInputFormat.
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/WALInputFormat.java