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https://issues.apache.org/jira/browse/SPARK-5698?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Or closed SPARK-5698.
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Resolution: Fixed
Fix Version/s: 1.2.2
1.3.0
Target Version/s: 1.3.0, 1.2.2 (was: 1.3.0)
> Dynamic allocation: do not allow user to request a negative delta
> -----------------------------------------------------------------
>
> Key: SPARK-5698
> URL: https://issues.apache.org/jira/browse/SPARK-5698
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, YARN
> Affects Versions: 1.2.0
> Reporter: Andrew Or
> Assignee: Andrew Or
> Priority: Critical
> Fix For: 1.3.0, 1.2.2
>
>
> If the user calls the following in series:
> sc.requestExecutors(-5)
> sc.killExecutor(...)
> Then we might crash the ApplicationMaster. Why?
> Well, if we request a negative number of additional executors, then the
> YarnAllocator will lower the target number of executors it is trying to
> achieve by 5. This might shoot the target number past 0. Then, if so, when we
> try to kill an executor it will fail the assertion that the target number
> must be >=0.
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