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  1. Hadoop HDFS
  2. HDFS-15879

Exclude slow nodes when choose targets for blocks

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      Previously, we have monitored the slow nodes, related to HDFS-11194.

      We can use a thread to periodically collect these slow nodes into a set. Then use the set to filter out slow nodes when choose targets for blocks.

      This feature can be configured to be turned on when needed.

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            tomscut Tao Li
            tomscut Tao Li
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