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Posted to dev@lucene.apache.org by "David Smiley (JIRA)" <ji...@apache.org> on 2019/02/01 20:52:00 UTC
[jira] [Commented] (SOLR-12999) Index replication could delete
segments first
[ https://issues.apache.org/jira/browse/SOLR-12999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16758658#comment-16758658 ]
David Smiley commented on SOLR-12999:
-------------------------------------
Woah; why did this land in 8.0 and without a code review? That's a no-no during a release.
> 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
> Assignee: Noble Paul
> Priority: Major
> Fix For: 8.0
>
> Attachments: SOLR-12999.patch, SOLR-12999.patch
>
>
> 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 probably only be useful if there is no SolrIndexSearcher open, since it would prevent the removal of files.
> The motivating scenario is a SolrCloud replica that is going into full recovery. It ought to not be fielding searches. The code changes would not depend on SolrCloud though.
> This option would have some danger the user should be aware of. If the replication fails, leaving the local files incomplete/corrupt, the only recourse is to try full replication again. You can't just give up and field queries.
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