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  1. Hadoop HDFS
  2. HDFS-16510

Fix EC decommission when rack is not enough

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      The decommission always fail when we start decommission multiple nodes on a cluster whose racks is not enough, a cluster with 6 racks to deploy RS-6-3, for example.

      We find that those decommission nodes cover at least a rack, it's actulaly like we are decommission one or more racks. And rack decommission is not well supported currently, especially for cluster whose racks is not enough already.

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            cndaimin daimin
            cndaimin daimin
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