@Override
    public int getPartition(LinkKey linkKey, LinkChain linkChain, int numPartitions) {
      int hash = linkKey.getChainId().hashCode();
      return Math.abs(hash % numPartitions);
    }
Class to figure out what partition to send a link in the chain to. This is based upon the
linkKey's ChainId.
hbase-it/src/test/java/org/apache/hadoop/hbase/mapreduce/IntegrationTestBulkLoad.java