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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