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https://issues.apache.org/jira/browse/BEAM-315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15312670#comment-15312670
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Pawel Szczur commented on BEAM-315:
-----------------------------------
So, I've started digging into the {{FlinkBatchTransformTranslators}}. The only
thing I've found: the items leave {{FlinkPartialReduceFunction}} groupped
correctly. Then they arrive to {{FlinkReduceFunction}} in groups but not all
values of a given key at once.
I'm not sure how Flink shuffles/sorts the data. The direction you've looked:
hashCode/comparator seems good, but I think the bug is outside the
{{KvCoderComparator}}.
> Flink Runner compares keys unencoded which may produce incorrect results
> ------------------------------------------------------------------------
>
> Key: BEAM-315
> URL: https://issues.apache.org/jira/browse/BEAM-315
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Affects Versions: 0.1.0-incubating
> Reporter: Pawel Szczur
> Assignee: Aljoscha Krettek
> Attachments: CoGroupPipelineStringKey.java, execution.log,
> execution_split.log, execution_split_sorted.log
>
>
> Same keys are processed multiple times.
> A repo to reproduce the bug:
> https://github.com/orian/cogroup-wrong-grouping
> Discussion:
> http://mail-archives.apache.org/mod_mbox/incubator-beam-user/201605.mbox/%3CCAB2uKkG2xHsWpLFUkYnt8eEzdxU%3DB_nu6crTwVi-ZuUpugxkPQ%40mail.gmail.com%3E
> Notice: I haven't tested other runners (didn't manage to configure Spark).
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