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https://issues.apache.org/jira/browse/KNOX-2214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17032649#comment-17032649
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Sandor Molnar commented on KNOX-2214:
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I think it's worth checking this:
[https://github.com/ben-manes/caffeine/wiki/Writer]
> Reaping of expired Knox tokens
> ------------------------------
>
> Key: KNOX-2214
> URL: https://issues.apache.org/jira/browse/KNOX-2214
> Project: Apache Knox
> Issue Type: Bug
> Components: Server
> Affects Versions: 1.4.0
> Reporter: Philip Zampino
> Assignee: Sandeep More
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When the TokenStateService is employed, if Knox-issued tokens aren't
> explicitly cancelled, then they remain in the persistent store forever. The
> TokenStateService should maintain a thread that removes expired tokens.
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