Prashant Pogde created HDDS-8685:
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Summary: CreateCheckpoint needs to be idemp[otent
Key: HDDS-8685
URL: https://issues.apache.org/jira/browse/HDDS-8685
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Prashant Pogde
Assignee: Aswin Shakil
Create snapshot can be called multiple times with log replay. We need to make
sure that it's idempotent. Consider scenarios
* Create rocksDB checkpoint itself can cause issues.
- RocksDB will create hardlinks in a temp directory
- after links are created, temp dir is renamed to snapshot-id
- we make entry in snapshot info table
Operation could fail at any time due to OM crash/restart and log replay will
start from the beginning here. We need to make sure
* We need to make sure clean up the temp directory. un-removed hardlinks will
pose a problem because we sst files with these hardlink will not get cleaned up
when the snapshots are deleted due to extra link.
* CreateCheckpoint doesn't try to recreated the checkpoint again. (rocksDB
operation would fail)
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