@Override
  protected float getReadShare(final Configuration conf) {
    return conf.getFloat(META_CALL_QUEUE_READ_SHARE_CONF_KEY, DEFAULT_META_CALL_QUEUE_READ_SHARE);
  }
RPC Executor that uses different queues for reads and writes for meta.
hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/MetaRWQueueRpcExecutor.java