[jira] [Resolved] (FLINK-10142) Reduce synchronization overhead for credit notifications

["Nico Kruber (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-10142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nico Kruber resolved FLINK-10142.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 1.5.4
                   1.7.0
                   1.6.1

Fixed via:
- master: 6c7603724be6c146cfc8019b77b60236d1d3d582
- release-1.6: 4cf197ede67dee9c4fbb41a4c5a8a61b40ddfa5d
- release-1.5: 9ae5009b6a82248bfae99dac088c1f6e285aa70f

> Reduce synchronization overhead for credit notifications
> --------------------------------------------------------
>
>                 Key: FLINK-10142
>                 URL: https://issues.apache.org/jira/browse/FLINK-10142
>             Project: Flink
>          Issue Type: Bug
>          Components: Network
>    Affects Versions: 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.6.0, 1.7.0
>            Reporter: Nico Kruber
>            Assignee: Nico Kruber
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.6.1, 1.7.0, 1.5.4
>
>
> When credit-based flow control was introduced, we also added some checks and optimisations for uncommon code paths that make common code paths unnecessarily more expensive, e.g. checking whether a channel was released before forwarding a credit notification to Netty. Such checks would have to be confirmed by the Netty thread anyway and thus only add additional load for something that happens only once (per channel).



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