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https://issues.apache.org/jira/browse/FLINK-19852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17239718#comment-17239718
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Arvid Heise commented on FLINK-19852:
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Merged into 1.11 as 05a7875448b6f92450083c17153e7f21e7de2e31.
> Managed memory released check can block IterativeTask
> -----------------------------------------------------
>
> Key: FLINK-19852
> URL: https://issues.apache.org/jira/browse/FLINK-19852
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Task
> Affects Versions: 1.11.0, 1.10.2, 1.12.0, 1.11.1, 1.11.2
> Reporter: shaomeng.wang
> Assignee: Roman Khachatryan
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.12.0, 1.11.3
>
> Attachments: image-2020-10-28-17-48-28-395.png,
> image-2020-10-28-17-48-48-583.png
>
>
> UnsafeMemoryBudget#reserveMemory, called on TempBarrier, needs time to wait
> on GC of all allocated/released managed memory at every iteration.
>
> stack:
> !image-2020-10-28-17-48-48-583.png!
> new TempBarrier in BatchTask
> !image-2020-10-28-17-48-28-395.png!
>
> These will be very slow than before.
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