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Posted to commits@samza.apache.org by GitBox <gi...@apache.org> on 2020/03/25 22:09:05 UTC
[GitHub] [samza] bkonold opened a new pull request #1330: SAMZA-2353:
Support standby containers with transactional state
bkonold opened a new pull request #1330: SAMZA-2353: Support standby containers with transactional state
URL: https://github.com/apache/samza/pull/1330
**Symptom:** Job has transactional state (checkpoint & restore) and standby enabled. When an active container fails over, it bootstraps state from changelog as it is unable to re-use state written by the standby container.
**Cause:** The failed-over active container expects store checkpoint directories such that the last consumed offset for the store is <= the latest checkpoint offset for that store SSP.
**Changes:** Described in detail here. https://docs.google.com/document/d/1FcWWcig_rc86bTt2G9ZJxuIRQ6dUu-hVUCXVhyKJpOU/edit?usp=sharing
**Tests:** WIP
**API Changes:** `TaskSideInputStorageManager` is extracted as an interface, adding two methods:
```
checkpoint(CheckpointId checkpointId)
removeOldCheckpoints(CheckpointId checkpointId)
```
with two implementing classes: `TransactionalTaskSideInputStorageManager` and `NonTransactionalTaskSideInputStorageManager`
**Upgrade Instructions:** None
**Usage Instructions:** New behavior is enabled with the config `task.transactional.state.checkpoint.enabled` set to true.
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[GitHub] [samza] bkonold closed pull request #1330: SAMZA-2353: Support
standby containers with transactional state
Posted by GitBox <gi...@apache.org>.
bkonold closed pull request #1330: SAMZA-2353: Support standby containers with transactional state
URL: https://github.com/apache/samza/pull/1330
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