Hemant Kumar created HDDS-12316:
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Summary: Snapshot purge first updates deleted snapshot and then
purge it.
Key: HDDS-12316
URL: https://issues.apache.org/jira/browse/HDDS-12316
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Hemant Kumar
As part of the changes in PR#7045, a local map was added to
OMSnapshotPurgeRequest to reduce the number of calls to the DB. The same map
was later passed to OMSnapshotPurgeResponse to update the DB. The problem is
that Snapshot to be purged is added to this map as well. So while updating the
DB as part of the doubleBuffer flush, we first update the snapshot and then
purge it. It is not wrong in correctness but unnecessary update. Also, we log
the snapshotToBePurged and updatedMap in
[OMSnapshotPurgeResponse|https://github.com/apache/ozone/pull/7045/files#diff-a424f5d3db1b2b8c0ffede0b757478c8ab646ea7f7990fd13f36f0346e6a73e0R125]
which creates confusion if the entry is deleted, updated, or both.
Here is an example log form a live cluster
{code:java}
ozone-om.log.4:2025-02-10 16:54:53,521 INFO [OM StateMachine ApplyTransaction
Thread - 0]-org.apache.hadoop.ozone.om.request.snapshot.OMSnapshotPurgeRequest:
Successfully executed snapshotPurgeRequest: {snapshotDBKeys: "/vol/bucket/cm-tm
p-5a462285-ca48-4c7a-b2b8-63a590f1d3ef" ozone-om.log.4:} along with updating
snapshots:{/vol/bucket/cm-tmp-5a462285-ca48-4c7a-b2b8-63a590f1d3ef=SnapshotInfo{snapshotId:
'51a5d74f-526f-42f6-bce7-e54603326626', name:
'cm-tmp-5a462285-ca48-4c7a-b2b8-63a590f1d3ef', volumeName: 'vol', bucketName:
'bucket', snapshotStatus: 'SNAPSHOT_DELETED', creationTime: '1739228072015',
deletionTime: '1739228084229', pathPreviousSnapshotId:
'87c4c52e-ea4e-4e47-8dfa-707655eaf295', globalPreviousSnapshotId:
'a05e17e6-91ec-44b8-918c-5d412fd4dd33', snapshotPath: 'vol/bucket',
checkpointDir: '-51a5d74f-526f-42f6-bce7-e54603326626', dbTxSequenceNumber:
'6249154121', deepClean: 'true', sstFiltered: 'false'}} {code}
This task is to remove the purgedSnapshot from updatedMap before logging and
passing it to the OMSnapshotPurgeResponse to keep it clean.
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