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https://issues.apache.org/jira/browse/FLINK-10066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16569857#comment-16569857
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ASF GitHub Bot commented on FLINK-10066:
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StefanRRichter opened a new pull request #6500: [FLINK-10066] Keep only
archived version of previous executions
URL: https://github.com/apache/flink/pull/6500
## What is the purpose of the change
Currently, the execution vertex stores a limited amount of previous
executions in a bounded list. This happens primarily for archiving purposes and
to remember previous locations and allocation ids. We remember the whole
execution to eventually convert it into an archived execution.
This seems unnecessary and dangerous as we have observed that this strategy
is prone to memory leaks in the job manager. With a very high vertex count or
parallelism, remembering complete executions can become very memory intensive.
Instead I suggest to eagerly transform the executions into the archived version
before adding them to the list, i.e. only the archived version is ever still
referenced after the execution becomes obsolete. This gives better control over
which information about the execution should really be kept in memory.
## Brief change log
Convert `Execution` directly to `ArchivedExecution` before remembering it in
the bounded list. I added the `AttemptID` to `ArchivedExecution` so that we can
still support all previous requirements.
## Verifying this change
This change is a trivial rework / code cleanup without any test coverage.
## 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): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes)
- 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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> Keep only archived version of previous executions
> -------------------------------------------------
>
> Key: FLINK-10066
> URL: https://issues.apache.org/jira/browse/FLINK-10066
> Project: Flink
> Issue Type: Improvement
> Components: JobManager
> Affects Versions: 1.4.3, 1.5.2, 1.6.0
> Reporter: Stefan Richter
> Assignee: Stefan Richter
> Priority: Major
> Labels: pull-request-available
>
> Currently, the execution vertex stores a limited amount of previous
> executions in a bounded list. This happens primarily for archiving purposes
> and to remember previous locations and allocation ids. We remember the whole
> execution to eventually convert it into an archived execution.
> This seems unnecessary and dangerous as we have observed that this strategy
> is prone to memory leaks in the job manager. With a very high vertex count or
> parallelism, remembering complete executions can become very memory
> intensive. Instead I suggest to eagerly transform the executions into the
> archived version before adding them to the list, i.e. only the archived
> version is ever still referenced after the execution becomes obsolete. This
> gives better control over which information about the execution should really
> be kept in memory.
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