[jira] [Closed] (FLINK-19385) Channel recovery may deadlock

["Roman Khachatryan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-19385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Roman Khachatryan closed FLINK-19385.
-------------------------------------
    Release Note: Fixed by FLINK-18990
      Resolution: Duplicate

> Channel recovery may deadlock
> -----------------------------
>
>                 Key: FLINK-19385
>                 URL: https://issues.apache.org/jira/browse/FLINK-19385
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Runtime / Network, Runtime / Task
>    Affects Versions: 1.12.0
>            Reporter: Roman Khachatryan
>            Assignee: Roman Khachatryan
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 1.12.0
>
>
> Consider the following case:
>  * Two IntputGates
>  * Input selection is not ALL (say FIRST initially)
>  * Unaligned Checkpoints ON
>  * on recovery, there are "parts" of records in all channels (actually 1 is enough I think)
> What happens:
>  # StreamTask initiates recovery and scedule partition request upon it's end
>  # All gates and channels will receive buffers from StateReader
>  # All channels of a single gate will consume those state buffers - completing that gate's StateConsumedFuture
>  # InputProcessor will return NOTHING_AVAILABLE (see StreamTwoInputProcessor.getInputStatus)
>  # StreamTask will suspend its default action
>  # State of the 2nd gate won't be consumed - so its StateConsumedFutures won't be completed - so no partitions will be requested
> Solution: request partitions independently for each channel.



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