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https://issues.apache.org/jira/browse/SAMZA-1347?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jake Maes resolved SAMZA-1347.
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Resolution: Fixed
Fix Version/s: 0.13.1
Issue resolved by pull request 233
[https://github.com/apache/samza/pull/233]
> GroupByContainerIds NPE if containerIds list is null
> ----------------------------------------------------
>
> Key: SAMZA-1347
> URL: https://issues.apache.org/jira/browse/SAMZA-1347
> Project: Samza
> Issue Type: Improvement
> Reporter: Jake Maes
> Assignee: Jake Maes
> Fix For: 0.13.1
>
>
> Another low-hanging fruit. The null check in group() happens AFTER checking
> the size of containerIds. These statements should be reordered.
> Also, Since the group(tasks) method always calls the group(tasks,
> containerIds) method, lets just move all the safety checks there.
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