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Posted to mapreduce-issues@hadoop.apache.org by "Zhijie Shen (JIRA)" <ji...@apache.org> on 2014/06/25 07:30:25 UTC

[jira] [Created] (MAPREDUCE-5940) Avoid negative elapsed time in JHS/MRAM web UI and services

Zhijie Shen created MAPREDUCE-5940:
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             Summary: Avoid negative elapsed time in JHS/MRAM web UI and services
                 Key: MAPREDUCE-5940
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5940
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobhistoryserver, mr-am, webapps
            Reporter: Zhijie Shen
            Assignee: Zhijie Shen


Recently we observed a rare bug that an elapsed time of a reducer is going to be negative on JHS web UI and via REST APIs. While the real reason for this bug seems to be clock asynchronization on different hosts, the web frontend should have masked the negative values. However, in the current code, *org.apache.hadoop.mapreduce.v2.app.webapp.dao.** only check whether the elapsed time is -1 or not.



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