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From "Arvid Heise (Jira)" <j...@apache.org>
Subject [jira] [Created] (FLINK-14304) Avoid task starvation with mailbox
Date Tue, 01 Oct 2019 08:45:00 GMT
Arvid Heise created FLINK-14304:
-----------------------------------

             Summary: Avoid task starvation with mailbox
                 Key: FLINK-14304
                 URL: https://issues.apache.org/jira/browse/FLINK-14304
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Task
            Reporter: Arvid Heise


Currently, all mails are always prioritized over regular input, which makes sense in most
cases. However, it's easy to devise an operator that gets into starvation: each mail enqueues
a new mail.

This ticket implements a simple extension in the mailbox processor: instead of draining the
mailbox one-by-one, fetch all mails from the mailbox and run them one-by-one before running
the default action. Only then, fetch all mails again and repeat.

So we execute all mails that are available at the start of this loop but no mails that are
added in the meantime.

Special attention needs to be directed towards yield to downstream, such that it doesn't process
mails outside of the current batch.



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