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https://issues.apache.org/jira/browse/SOLR-12999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16693670#comment-16693670
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Michael Braun commented on SOLR-12999:
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[~erickerickson] right, it should never be serving queries as it's in a
'recovering' rather than 'active' state. If it were to serve queries it would
be in out of sync data. The replica has to know it can never serve traffic
again unless it fully recovers. If the sync fails to complete, it will need to
start over rather than using what it has as an active replica.
> 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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