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https://issues.apache.org/jira/browse/CRUNCH-655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikael Goldmann updated CRUNCH-655:
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Attachment: OuterJoinTest.java
> DefaultJoinStrategy full outer join failing for spark pipeline
> --------------------------------------------------------------
>
> Key: CRUNCH-655
> URL: https://issues.apache.org/jira/browse/CRUNCH-655
> Project: Crunch
> Issue Type: Bug
> Components: Spark
> Environment: Mac OSX, crunch 0.13.0 and 0.15.0 (with reproduction
> code), Ubuntu 14.04 (repro code not tried, but similar issue in production
> with 0.13.0)
> Reporter: Mikael Goldmann
> Attachments: OuterJoinTest.java
>
>
> When the left and right table in the the join have entries with the same key,
> they do not alway end up together. Cannot reproduce when running the join
> with a single reducer, and happens more commonly if there are many reducers
> and very few copies of each key to the left and right.
> My guess is that it sometimes happens that the left value for key k ends up
> on a different reducer from the right value with key k.
> With my production issue, it went away if I either used a single reducer or
> used cogroup instead.
> I've attached a class to reproduce the issue.
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