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

[Shang Yuanchun (Jira)]

Roman Khachatryan created FLINK-19385:
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             Summary: Channel recovery may deadlock
                 Key: FLINK-19385
                 URL: https://issues.apache.org/jira/browse/FLINK-19385
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Network, Runtime / Task
    Affects Versions: 1.11.2, 1.12.0
            Reporter: Roman Khachatryan
            Assignee: Roman Khachatryan
             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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