@Override
    public String[] getLocations() throws IOException, InterruptedException {
      // TODO: Find the data node with the most blocks for this WAL?
      return new String[] {};
    }
Represent an WALSplit, i.e. a single WAL file. Start- and EndTime are managed by the split,
so that WAL files can be filtered before WALEdits are passed to the mapper(s).
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/WALInputFormat.java