yinan zhan created HADOOP-17584:
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             Summary: s3a committer 
                 Key: HADOOP-17584
                 URL: https://issues.apache.org/jira/browse/HADOOP-17584
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs/s3
    Affects Versions: 3.2.0
            Reporter: yinan zhan


s3a magic committer isRecoverySupported() is false, so will restart all task 
after application master restart for am jvm crashed, leaving pendingset in 
magic path not to clear. pendingset name format is jobAttemptPath + 
taskAttemptID.getTaskID() + ".pendingset". These pendingset files are 
overwritted by new task commit.


But if in new am attempt, a speculative task overcomes origin task, so 
pendingset file in last attempt may be hold for job commit, the data for commit 
is wrong



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