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https://issues.apache.org/jira/browse/MAPREDUCE-6303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14394523#comment-14394523
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Hudson commented on MAPREDUCE-6303:
-----------------------------------
FAILURE: Integrated in Hadoop-Hdfs-trunk #2084 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/2084/])
MAPREDUCE-6303. Read timeout when retrying a fetch error can be fatal to a
reducer. Contributed by Jason Lowe. (junping_du: rev
eccb7d46efbf07abcc6a01bd5e7d682f6815b824)
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/task/reduce/TestFetcher.java
* hadoop-mapreduce-project/CHANGES.txt
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/Fetcher.java
> Read timeout when retrying a fetch error can be fatal to a reducer
> ------------------------------------------------------------------
>
> Key: MAPREDUCE-6303
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6303
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Blocker
> Fix For: 2.7.0
>
> Attachments: MAPREDUCE-6303.001.patch
>
>
> 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.
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