[jira] [Created] (HDFS-4351) Fix BlockPlacementPolicyDefault#chooseTarget when avoiding stale nodes

["Andrew Wang (JIRA)" <ji...@apache.org>]

Andrew Wang created HDFS-4351:
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             Summary: Fix BlockPlacementPolicyDefault#chooseTarget when avoiding stale nodes
                 Key: HDFS-4351
                 URL: https://issues.apache.org/jira/browse/HDFS-4351
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Andrew Wang
            Assignee: Andrew Wang


There's a bug in {{BlockPlacementPolicyDefault#chooseTarget}} with stale node avoidance enabled (HDFS-3912). If a NotEnoughReplicasException is thrown in the call to {{chooseRandom()}}, {{numOfReplicas}} is not updated together with the partial result in {{result}} since it is pass by value. The retry call to {{chooseTarget}} then uses this incorrect value.

This can be seen if you enable stale node detection for {{TestReplicationPolicy#testChooseTargetWithMoreThanAvaiableNodes()}}.

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