[MAPREDUCE-6303] Read timeout when retrying a fetch error can be fatal to a reducer - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Blocker
Resolution: Fixed
Affects Version/s: 2.6.0
Fix Version/s: 2.7.0, 2.6.1, 3.0.0-alpha1
Component/s: None
Labels:
- 2.6.1-candidate

Target Version/s:

2.7.0
Hadoop Flags:

Reviewed

Description

If a reducer encounters an error trying to fetch from a node then encounters a read timeout when trying to re-establish the connection then the reducer can fail. The read timeout exception can leak to the top of the Fetcher thread which will cause the reduce task to teardown. This type of error can repeat across reducer attempts causing jobs to fail due to a single bad node.