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https://issues.apache.org/jira/browse/FLINK-10146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17236100#comment-17236100
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Robert Metzger commented on FLINK-10146:
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[~NicoK] is this still a problem?
> numBuffersOut not updated properly
> ----------------------------------
>
> Key: FLINK-10146
> URL: https://issues.apache.org/jira/browse/FLINK-10146
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Metrics, Runtime / Network
> Affects Versions: 1.5.3, 1.6.1, 1.7.0
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Major
>
> We only enqueue a {{BufferConsumer}} once into the result (sub)partition but
> Netty may draw and send parts of it independently. {{numBuffersOut}} is,
> however, only increased when a new buffer is retrieved from the buffer pool,
> not when an actual buffer is sent via Netty. This metric is thus wrong.
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