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https://issues.apache.org/jira/browse/SOLR-15706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17438166#comment-17438166
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Jason Gerlowski commented on SOLR-15706:
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I've uploaded a script (based on Don's instructions, thanks!) to ease
reproduction a bit.
The root cause looks to be that a line in the "purge" code looks for "shard
metadata" files in the wrong directory. Not finding the right shard metadata
files causes valid, in-use index files to look "orphaned" (and ultimately be
cleaned up by the purge).
The fix is pretty trivial. I'll commit a fix soon, and look into why our
existing tests didn't catch this.
> After an incremental back up, the pugeUnused operation incorrectly deletes
> all backed up data
> ---------------------------------------------------------------------------------------------
>
> Key: SOLR-15706
> URL: https://issues.apache.org/jira/browse/SOLR-15706
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Backup/Restore
> Affects Versions: 8.9
> Reporter: Don
> Assignee: Jason Gerlowski
> Priority: Critical
> Attachments: reproduce.sh
>
>
> Reproduction Steps: # Create a collection _'foo',_
> # Insert small number of documents (_say 10_) into collection _'foo'_
> # Backup collection _'foo'_ using collections API
> (/admin/collections?action=BACKUP), this should result in creation of
> _backupId 0_
> # Backup collection _'foo'_ again using collections API
> (/admin/collections?action=BACKUP), this should result in creation of
> _backupId 1_
> # Delete _backupId 0_ for collection _'foo'_
> (/admin/collections?action=DELETEBACKUP?backupId=0)
> # Run delete backup for collection _'foo'_ again, this time with
> _'purgeUnused=true'_ (/admin/collections?action=DELETEBACKUP?purgeUnused=true)
> # Restore from _backupId 1_ which still exists to collection _'bar'_
> (/admin/collections?action=RESTORE)
> Expected Result: # Restored collection 'bar' has 10 documents in it
> Actual Result: # Restored collection 'bar' has 0 documents in it
> We found in our testing that when purge is used it incorrectly deletes all
> backup data instead of just the unused data as it supposed to.
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