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https://issues.apache.org/jira/browse/OAK-6052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15964234#comment-15964234
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Francesco Mari commented on OAK-6052:
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[~jsedding], I committed a slightly modified version of your patch at r1790957.
The modifications I made are mainly due to the fact that {{readers}} can be
{{null}}, which prevents a {{Node}} from being safely iterated over without
first checking for nullability. Thanks for the contribution!
> Cleanup blocks writers
> ----------------------
>
> Key: OAK-6052
> URL: https://issues.apache.org/jira/browse/OAK-6052
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Francesco Mari
> Labels: cleanup, gc
> Fix For: 1.7.0, 1.8
>
> Attachments: OAK-6052-reader-iterable.patch
>
>
> The refactoring from OAK-6002 moved the cleanup of the tar readers into the
> read lock, which blocks concurrent writers from progressing. This was a
> problem with {{oak-segment}} before and fixed with OAK-3329.
> As cleanup can take up to a couple of minutes on busy system we should
> re-establish the former behaviour.
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