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https://issues.apache.org/jira/browse/CASSANDRA-18211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17683071#comment-17683071
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Stefan Miklosovic commented on CASSANDRA-18211:
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We agreed with [~jlewandowski] that we need to dig a little bit deeper here and
synchronize how snapshots are loaded too. It may theoretically race when
snapshots are being loaded by nodetool listsnapshots and we remove some
snapshot in the meanwhile as well.
> Possible race between automatic and manual snapshot cleanup
> -----------------------------------------------------------
>
> Key: CASSANDRA-18211
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18211
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Snapshots
> Reporter: Jacek Lewandowski
> Assignee: Jacek Lewandowski
> Priority: Normal
> Fix For: 4.1.x, 4.x
>
>
> Automatic deletion of expired snapshots maintained by {{SnapshotManager}} can
> race with manual snapshot removal in a way an exception like
> {{NoSuchFileException}} is thrown.
> It is because the snapshot directory existence is checked and deleted if it
> exists as a non-atomic operation. Since we can potentially have two threads
> attempting to do that at the same time (automatic and manual snapshot
> removal) it may lead to a race in rare situations.
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