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https://issues.apache.org/jira/browse/CASSANDRA-16843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17400400#comment-17400400
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Brandon Williams commented on CASSANDRA-16843:
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This unfortunately not a simple thing to fix in an elegant manner. We have a
habit of assuming the lifetimes of snapshots will always be contained by their
respective CFs. It is that assumption that got us into both CASSANDRA-6418 and
CASSANDRA-6821, and now this ticket as well. Most of the code that handles
snapshots is in instance methods of Directories.java, which is instantiated
with CFMetatadata, and ultimately StorageService is accessing information
through them from the ColumnFamilyStore... which won't exist for dropped tables.
For trunk I think we should probably refactor snapshot handling altogether to
dissolve the marriage between CFs and snapshots a bit, but for existing
versions I'm not sure what the least invasive way of reworking this is yet.
> auto-snapshots for dropped tables don't appear in nodetool listsnapshots
> ------------------------------------------------------------------------
>
> Key: CASSANDRA-16843
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16843
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Other
> Reporter: James Brown
> Assignee: Brandon Williams
> Priority: Normal
> Fix For: 3.11.x, 4.0.x
>
>
> Auto snapshots from dropped tables don't seem to show up in {{nodetool
> listsnapshots}} (even though they do get cleared by {{nodetool
> clearsnapshot}}). This makes them kind of annoying to clean up, since you
> need to muck about in the data directory to find them.
> Erick on the mailing list said that this seems to be an oversight and that
> clearsnapshot was fixed by
> [CASSANDRA-6418|https://issues.apache.org/jira/browse/CASSANDRA-6418].
> I reproduced this both on 3.11.11 and 4.0.0.
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