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https://issues.apache.org/jira/browse/FLINK-27530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17606530#comment-17606530
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fanrui commented on FLINK-27530:
--------------------------------
Hi [~godfreyhe] , as I understand, [~pnowojski] has written the release note
in FLINK-26762 before, that is :
{code:java}
New concept of overdraft network buffers was introduced to mitigate effects of
uninterruptible blocking a subtask thread during back pressure. Starting from
1.16.0 Flink subtask can request by default up to 5 extra (overdraft) buffers
over the regular configured amount (you can read more about this in the
documentation:
https://nightlies.apache.org/flink/flink-docs-master/docs/deployment/memory/network_mem_tuning/#overdraft-buffers).
This change can slightly increase memory consumption of the Flink Job. To
restore the older behaviour you can set
`taskmanager.network.memory.max-overdraft-buffers-per-gate` to zero.{code}
In theory it has no negative effects, but it is helpful for Unaligned
Checkpoints, and I'm not sure whether to introduce this feature in the
Flink-1.16 Release note.
> FLIP-227: Support overdraft buffer
> ----------------------------------
>
> Key: FLINK-27530
> URL: https://issues.apache.org/jira/browse/FLINK-27530
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Checkpointing, Runtime / Network
> Reporter: fanrui
> Assignee: fanrui
> Priority: Major
> Fix For: 1.16.0
>
>
> This is the umbrella issue for the feature of unaligned checkpoints. Refer to
> the
> [FLIP-227|https://cwiki.apache.org/confluence/display/FLINK/FLIP-227%3A+Support+overdraft+buffer]
> for more details.
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