zjureel opened a new pull request #18007:
URL: https://github.com/apache/flink/pull/18007
## What is the purpose of the change
This PR adds a scheduled thread pool to hold the periodic tasks and send
them to akka with gateway when they should be executed. These periodic tasks
such as resource timeout checker, heartbeat checker and some other tasks are
scheduled by akka thread pool now, and they are alive even when the job or
tasks reach termination, it will cause FullGC.
## Brief change log
- Add a scheduled thread pool to hold the periodic tasks and send them to
akka with gateway when they should be executed
- Create the scheduled thread pool in Endpoint and close it when Endpoint
is closed.
## Verifying this change
Please make sure both new and modified tests in this PR follows the
conventions defined in our code quality guide:
https://flink.apache.org/contributing/code-style-and-quality-common.html#testing
*(Please pick either of the following options)*
This change is a trivial rework / code cleanup without any test coverage.
*(or)*
This change is already covered by existing tests, such as *(please describe
tests)*.
*(or)*
This change added tests and can be verified as follows:
*(example:)*
- Added test ScheduledMainThreadExecutorTest that validates the
ScheduledMainThreadExecutor
- Endpoint related changes are covered by existing test RpcEndpointTest
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / no) no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / no) no
- The serializers: (yes / no / don't know) no
- The runtime per-record code paths (performance sensitive): (yes / no /
don't know) no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / no / don't know)
no
- The S3 file system connector: (yes / no / don't know) no
## Documentation
- Does this pull request introduce a new feature? (yes / no) no
- If yes, how is the feature documented? (not applicable / docs / JavaDocs
/ not documented) not documented
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