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https://issues.apache.org/jira/browse/SOLR-624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12612244#action_12612244
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Doug Steigerwald commented on SOLR-624:
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If you have lots of cores committing very often (like we do), it can totally
thrash your system. I was planning on implementing something like this at very
soon. Glad someone else already did.
> patch: Don't take snapshot if there are no differences
> ------------------------------------------------------
>
> Key: SOLR-624
> URL: https://issues.apache.org/jira/browse/SOLR-624
> Project: Solr
> Issue Type: Improvement
> Components: replication
> Affects Versions: 1.3
> Reporter: Richard "Trey" Hyde
> Fix For: 1.3
>
> Attachments: solr.check.patch
>
>
> This is similar in concept to a change I made several years ago in Solar.
> Cronned snapshooters can quickly generate a lot of snaps which will then be
> unnecessarily distributed to the slaves if there hasn't been any changes in
> that period.
> Adds a "check" argument to make sure there where changes to the index before
> taking the snap.
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