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Posted to mapreduce-dev@hadoop.apache.org by "yanglongfei (JIRA)" <ji...@apache.org> on 2019/07/01 07:23:00 UTC
[jira] [Created] (MAPREDUCE-7222) Map tasks' outputs can not be
recovered when ApplicationMaster relaunched
yanglongfei created MAPREDUCE-7222:
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Summary: Map tasks' outputs can not be recovered when ApplicationMaster relaunched
Key: MAPREDUCE-7222
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7222
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Affects Versions: 2.7.3
Reporter: yanglongfei
When AM crashes, Yarn would launch a new AM instance and recover all its scheduled tasks. However mapper tasks's committed output files are not recovered when the number of reducers > 0. In my application which output files from mapper and make use of reducer to collect statistics not able to fully recover from the AM crash, and resulting in data from the previous completed mapper tasks get lost in the final output dir.
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