@Override
    protected void
      cleanup(Mapper<WALKey, WALEdit, ImmutableBytesWritable, Mutation>.Context context)
        throws IOException, InterruptedException {
      super.cleanup(context);
    }
A mapper that writes out {@link Mutation} to be directly applied to a running HBase instance.
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/WALPlayer.java