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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