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https://issues.apache.org/jira/browse/FLINK-18727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17301427#comment-17301427
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Yingjie Cao commented on FLINK-18727:
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This issue is introduced by FLINK-16428, now it is not needed, so closing it.
> Remove the previous finished empty Buffer in PipelinedSubpartition when
> adding a new Buffer
> -------------------------------------------------------------------------------------------
>
> Key: FLINK-18727
> URL: https://issues.apache.org/jira/browse/FLINK-18727
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Network
> Reporter: Yingjie Cao
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.13.0
>
>
> For current implementation of PipelinedSubpartition, empty Buffer consumes
> credit, which means we need at lease one credit to handle the finished empty
> Buffer without any data. We can remove and recycle the finished empty Buffer
> in the queue when adding a new Buffer, after which, the reader does not need
> any available credit to handle the finished empty buffer. For example, if the
> new buffer is an event and the previous buffer is finished but without any
> data, after it is removed, the reader is able to process the new added event
> without any available credit.
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