smengcl opened a new pull request, #9810:
URL: https://github.com/apache/ozone/pull/9810

   ## What changes were proposed in this pull request?
   
   In isSnapshotPurged() check, snapshot chain tableKey returning null should 
not be the sole indicator for judging whether the snapshot is still active or 
not.
   
   isSnapshotPurged() incorrectly returning true causes 
checkOrphanSnapshotVersions() to incorrectly removing active snapshot's YAML 
metadata (in OmSnapshotLocalDataManagerService runs). This in turn causes NPE 
in CacheLoader when attempting to load the snapshot.
   
   - Fixed `isSnapshotPurged()` check
   - Added relevant debug logging messages that might be helpful at some point
   - Add entries to snapshotIdToTableKey in case of Raft replay in 
OMSnapshotCreateResponse#addToDBBatch (which was a bug / an oversight 
previously)
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/HDDS-14699
   
   ## How was this patch tested?
   
   - Added test `testCheckOrphanSnapshotVersionsWithStaleSnapshotChain`
   - Manually tested downstream that with the patch, the issue does not appear 
in the system test suite


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