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https://issues.apache.org/jira/browse/AVRO-944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139392#comment-13139392
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Julien Muller commented on AVRO-944:
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I have jobs that presented the same symptoms when having a combiner.
We ran some testing on our jobs with this patch on 1.5.1 and the result is
successful.
This is good news that this patch will be included in the RC, since using the
combiner divided the job execution time by 30!
> Java: reduce-side combine uses wrong serializer
> -----------------------------------------------
>
> Key: AVRO-944
> URL: https://issues.apache.org/jira/browse/AVRO-944
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.6.0
> Reporter: Doug Cutting
> Assignee: Doug Cutting
> Fix For: 1.6.0
>
> Attachments: AVRO-944.patch
>
>
> When a reduce-side combine is run, Avro's mapreduce API incorrectly uses the
> final output serializer rather than the map-output serializer.
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