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https://issues.apache.org/jira/browse/CASSANDRA-18211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17689764#comment-17689764
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Jacek Lewandowski commented on CASSANDRA-18211:
-----------------------------------------------
+1
We will need a follow-up ticket to cleanup comprehensively the snapshot
management mess. This ticket fixes an error which results from lack of
synchronization of tasks which should be synchronized.
> 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: Stefan Miklosovic
> 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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