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  1. Hadoop HDFS
  2. HDFS-17052

Improve BlockPlacementPolicyRackFaultTolerant to avoid choose nodes failed when no enough Rack.

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      When writing EC data, if the number of racks matching the storageType is insufficient, more than one block are allowed to be written to the same rack

       

       

       

      However, during EC block recovery, it is not possible to recover on the same rack, which deviates from the expected behavior.

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        1. failed reconstruction ec in same rack-1.png
          2.22 MB
          Hualong Zhang
        2. write ec in same rack.png
          2.11 MB
          Hualong Zhang

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              zhtttylzz Hualong Zhang
              zhtttylzz Hualong Zhang
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