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https://issues.apache.org/jira/browse/SLING-6503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851559#comment-15851559
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Timothee Maret commented on SLING-6503:
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Attached a patch otherwise available at
https://github.com/tmaret/sling/commit/e67a77a0664145d5607ea822f2523a4505f53023.patch
> Concurrency issue can prevent repository packages to be cleaned up
> ---------------------------------------------------------------------
>
> Key: SLING-6503
> URL: https://issues.apache.org/jira/browse/SLING-6503
> Project: Sling
> Issue Type: Bug
> Components: Content Distribution
> Affects Versions: Content Distribution Core 0.1.18
> Reporter: Timothee Maret
> Assignee: Timothee Maret
> Fix For: Content Distribution Core 0.1.20
>
> Attachments: SLING-6503.patch
>
>
> In SCD setups with more than one export queue and storing packages in the
> repository, packages may not be collected after being distributed to all
> queues.
> This is typically the case on the author instance of a Sync setup.
> The current implementation [0] stores a resource in the repository in order
> to keep track of each consumer of the package. When each consumer is done
> distributing to its queue, it checks if there is no more registered resources
> and remove the package if it is the case.
> The problem is that consumers run concurrently and without synchronisation,
> thus leading to situation where all consumers concurrently observe remaining
> consumers and the cleanup is never executed.
> [0]
> https://github.com/apache/sling/blob/trunk/contrib/extensions/distribution/core/src/main/java/org/apache/sling/distribution/packaging/impl/ResourceDistributionPackage.java
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