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https://issues.apache.org/jira/browse/SOLR-11670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16404292#comment-16404292
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David Smiley commented on SOLR-11670:
-------------------------------------

[~ab] you put this into the 7.3 section of CHANGES.txt but I think it belongs 
in 7.4?

> Implement a periodic house-keeping task
> ---------------------------------------
>
>                 Key: SOLR-11670
>                 URL: https://issues.apache.org/jira/browse/SOLR-11670
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: AutoScaling
>            Reporter: Andrzej Bialecki 
>            Assignee: Andrzej Bialecki 
>            Priority: Major
>             Fix For: 7.4, master (8.0)
>
>         Attachments: SOLR-11670.patch, SOLR-11670.patch, SOLR-11670.patch
>
>
> Some high-impact cluster changes (such as split shard) leave the original 
> data and original state that is no longer actively used. This makes sense due 
> to safety reasons and to make it easier to roll-back the changes.
> However, this unused data will accumulate over time, especially when actions 
> like split shard are invoked automatically by the autoscaling framework. We 
> need a periodic task that would clean up this kind of data after a certain 
> period.



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