GitHub user StephanEwen opened a pull request: https://github.com/apache/flink/pull/3312
[FLINK-5800] [checkpointing] Create CheckpointSteamFactory only once per operator Previously, the factory was created once per checkpoint, and its repeated initialization logic (like ensuring existence of base paths) caused heavy load on some filesystems at very large scale. This issue was reported by (and the solution suggested by) Steven Wu. ## Core Changes The `CheckpointStreamFactory` is now created once per operator upon initialization of the operator. The factory is also stored in the operator, alongside the `KeyedStateBackend` and the `OperatorStateBackend`. ## Tests This change does not introduce new functionality, but simply re-arranges current tests to handle and check the changes instantiation of the CheckpointStreamFactory. You can merge this pull request into a Git repository by running: $ git pull https://github.com/StephanEwen/incubator-flink stream_factory Alternatively you can review and apply these changes as the patch at: https://github.com/apache/flink/pull/3312.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #3312 ---- ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---