Nathan Roberts created HDFS-8404:
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             Summary: pending block replication can get stuck using older 
genstamp
                 Key: HDFS-8404
                 URL: https://issues.apache.org/jira/browse/HDFS-8404
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.7.0, 2.6.0
            Reporter: Nathan Roberts
            Assignee: Nathan Roberts


If an under-replicated block gets into the pending-replication list, but later 
the  genstamp of that block ends up being newer than the one originally 
submitted for replication, the block will fail replication until the NN is 
restarted. 

It will be safer if processPendingReplications()  gets up-to-date blockinfo 
before resubmitting replication work.






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