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https://issues.apache.org/jira/browse/FLINK-8747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhijiang closed FLINK-8747.
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> The tag of waiting for floating buffers in RemoteInputChannel should be
> updated properly
> ----------------------------------------------------------------------------------------
>
> Key: FLINK-8747
> URL: https://issues.apache.org/jira/browse/FLINK-8747
> Project: Flink
> Issue Type: Sub-task
> Components: Network
> Affects Versions: 1.5.0
> Reporter: zhijiang
> Assignee: zhijiang
> Priority: Minor
> Fix For: 1.5.0
>
>
> In credit-based flow control mode, when the number of available buffers is
> less than required buffers (backlog + initialCredit), the
> {{RemoteInputChannel}} will request floating buffers from {{BufferProvider}}.
> If not get enough available floating buffers, the {{RemoteInputChannel}}
> registers itself as listener in {{BufferProvider}} and updates the tag
> {{isWaitingForFloatingBuffers}} as {{true}} to avoid registration repeatedly.
>
> When a floating buffer is recycled to {{BufferProvider}}, it will notify the
> listener of available buffer. But the listener may not need floating buffers
> currently if the available buffers is not less than required buffers, then
> the floating buffers will be returned to {{BufferProvider}} directly. Most
> importantly, the tag {{isWaitingForFloatingBuffers}} should also be updated
> as {{false, otherwise the RemoteInputChannel}} will not request floating
> buffers any more after the available buffers less than required buffers.
>
> There are two scenarios for causing the above issue:
> * The recycled exclusive buffers increase the total available buffers which
> is equal to or more than required buffers.
> * The decreased sender's backlog resulting the available buffers equal to
> required buffers.
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