[GitHub] [flink] rkhachatryan opened a new pull request #10542: [FLINK-12484][runtime] move checkpoint lock to source task

[GitBox <gi...@apache.org>]

rkhachatryan opened a new pull request #10542: [FLINK-12484][runtime] move checkpoint lock to source task
URL: https://github.com/apache/flink/pull/10542
 
 
   ## What is the purpose of the change
   
   **This PR is WIP**
   
   This PR removes usages of the `StreamTask#getCheckpointLock()` method and moves the field to `SourceStreamTask`.
   Checkpoint lock acquisition in "network" tasks (not source/sink) is unnecessary after moving them to the mailbox execution model.
   
   
   This PR depends on the removal of the checkpoint lock usage from `ContinuousFileReaderOperator` (#10435).
   
   ## Brief change log
   
     - *remove usages of the `StreamTask#getCheckpointLock()` method *
     - *use `IMMEDIATE` (no-op) `StreamTaskActionExecutor` (decorator) in `StreamTask` by default*
     - *move the actual checkpoint lock object (field) to `SourceStreamTask` and use `SynchronizedStreamTaskActionExecutor` in it*
     - *remove testing of checkpoint lock acquisition*
     - *update other tests 
   
   ## Verifying this change
   
   This change is already covered by existing tests.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): yes (removes lock acquisition for mails in network tasks which may be per record)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
     - If yes, how is the feature documented? not applicable
   

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