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  1. Hadoop HDFS
  2. HDFS-16423

balancer should not get blocks on stale storages

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      We have met a problems as described in HDFS-16420

      We found that balancer copied a block multi times without deleting the source block if this block was placed in a stale storage. And resulting a block with many copies, but these redundant copies are not deleted until the storage become not stale.

       

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