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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5940) Avoid negative elapsed time in JHS/MRAM web UI and services
Date Wed, 25 Jun 2014 05:30:25 GMT
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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