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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/07/29 07:57:48 UTC

[GitHub] [flink] zhijiangW opened a new pull request #13006: [FLINK-18595][network] Fix the deadlock of concurrently recycling buffer and releasing input channel

zhijiangW opened a new pull request #13006:
URL: https://github.com/apache/flink/pull/13006


   
   ## What is the purpose of the change
   
   Assuming two remote channels with buffer managers as listeners in LocalBufferPool, the deadlock happens as follows:
   
   1. While the Canceler thread calling ch1#releaseAllResources, it will occupy the bufferQueue lock of bm1 and try to call bm2#notifyBufferAvailable.
   
   2. While the task thread recycling exclusive buffer for ch2, then it will occupy the bufferQueue lock of bm2 and try to call bm1#notifyBufferAvailable.
   
   3. These two threads will both occupy the respective bm's bufferQueue lock and wait for other side's bufferQueue lock to cause deadlock.
   
   Regarding the solution, we can check the released state outside of bufferQueue lock in BufferManager#notifyBufferAvailable to return immediately.
   
   ## Brief change log
   
   check the released state outside of bufferQueue lock in BufferManager#notifyBufferAvailable to return immediately.
   
   ## Verifying this change
   
   Verified by existing ITCase StreamFaultToleranceTestBase
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes / **no**)
     - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
   


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[GitHub] [flink] flinkbot edited a comment on pull request #13006: [FLINK-18595][network] Fix the deadlock of concurrently recycling buffer and releasing input channel

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13006:
URL: https://github.com/apache/flink/pull/13006#issuecomment-665003964






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[GitHub] [flink] flinkbot commented on pull request #13006: [FLINK-18595][network] Fix the deadlock of concurrently recycling buffer and releasing input channel

Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #13006:
URL: https://github.com/apache/flink/pull/13006#issuecomment-665000998






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[GitHub] [flink] zhijiangW merged pull request #13006: [FLINK-18595][network] Fix the deadlock of concurrently recycling buffer and releasing input channel

Posted by GitBox <gi...@apache.org>.
zhijiangW merged pull request #13006:
URL: https://github.com/apache/flink/pull/13006


   


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