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  1. Hadoop HDFS
  2. HDFS-16584

Record StandbyNameNode information when Balancer is running

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      When the Balancer is running, we allow block data to be fetched from the StandbyNameNode, which is nice. Here are some logs:

      But we have no way of knowing which NameNode the request was made to. We should log more detailed information, such as the host associated with the StandbyNameNode.

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            jianghuazhu JiangHua Zhu Assign to me
            jianghuazhu JiangHua Zhu
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