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https://issues.apache.org/jira/browse/FLINK-12536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16877759#comment-16877759
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Piotr Nowojski commented on FLINK-12536:
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With [~StephanEwen] we decided to postpone the resolution of this ticket until
we decide what to do with non credit based flow control.
> Make BufferOrEventSequence#getNext() non-blocking
> -------------------------------------------------
>
> Key: FLINK-12536
> URL: https://issues.apache.org/jira/browse/FLINK-12536
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Network
> Affects Versions: 1.9.0
> Reporter: Piotr Nowojski
> Assignee: Congxian Qiu(klion26)
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently it is non-blocking in case of credit-based flow control (default),
> however for \{{SpilledBufferOrEventSequence}} it is blocking on reading from
> file. We might want to consider reimplementing it to be non blocking with
> {{CompletableFuture<?> isAvailable()}} method.
>
> Otherwise we will block mailbox processing for the duration of reading from
> file - for example we will block processing time timers and potentially in
> the future network flushes.
>
> This is not a high priority change, since it affects non-default
> configuration option AND at the moment only processing time timers are
> planned to be moved to the mailbox for 1.9.
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