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https://issues.apache.org/jira/browse/SPARK-30274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17128586#comment-17128586
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Dongjoon Hyun commented on SPARK-30274:
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It was because we had a community report on the hang on that PR.
- https://github.com/apache/spark/pull/26914#issuecomment-566452079
> Avoid BytesToBytesMap lookup hang forever when holding keys reaching max
> capacity
> ---------------------------------------------------------------------------------
>
> Key: SPARK-30274
> URL: https://issues.apache.org/jira/browse/SPARK-30274
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.0.2, 2.1.3, 2.2.3, 2.3.4, 2.4.4, 3.0.0
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Major
> Labels: release-notes
> Fix For: 2.4.5, 3.0.0
>
>
> BytesToBytesMap.append allows to append keys until the number of keys reaches
> MAX_CAPACITY. But once the the pointer array in the map holds MAX_CAPACITY
> keys, next time call of lookup will hand forever.
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