beam-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Pawel Szczur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-315) Flink Runner compares keys unencoded which may produce incorrect results
Date Thu, 02 Jun 2016 17:03:59 GMT

    [ https://issues.apache.org/jira/browse/BEAM-315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15312670#comment-15312670
] 

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).



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message