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https://issues.apache.org/jira/browse/SOLR-12999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16693689#comment-16693689
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Erick Erickson commented on SOLR-12999:
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Or I can just stop commenting on a JIRA I know little about the genesis of ;)
> Index replication could delete segments first
> ---------------------------------------------
>
> Key: SOLR-12999
> URL: https://issues.apache.org/jira/browse/SOLR-12999
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: replication (java)
> Reporter: David Smiley
> Priority: Major
>
> Index replication could optionally delete files that it knows will not be
> needed _first_. This would reduce disk capacity requirements of Solr, and it
> would reduce some disk fragmentation when space get tight.
> Solr (IndexFetcher) already grabs the remote file list, and it could see
> which files it has locally, then delete the others. Today it asks Lucene to
> {{deleteUnusedFiles}} at the end. This new mode would only be useful if
> there is no SolrIndexSearcher open, since it would prevent the removal of
> files.
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