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https://issues.apache.org/jira/browse/SOLR-5730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15129131#comment-15129131
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Jack Krupansky commented on SOLR-5730:
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Let me try again... again, my apologies for not commenting much earlier before
things got a bit complicated. Let me see if I have this straight:
1. There are three related tickets: SOLR-4654, SOLR-5730, SOLR-8621.
2. There are three key features of interest: UpgradeIndexMergePolicy,
SortingMergePolicy , and EarlyTerminatingSortingCollector.
3. The first ticket is kind of the umbrella.
4. The second ticket is focused on the second and third features.
5. The third ticket is the foundation for all three features.
6. The third ticket has some user impact and delivers some additional minor
benefits, but enabling those other three features is its true purpose.
7. SortingMergePolicy and EarlyTerminatingSortingCollector are really two sides
of a single feature, the index side and the query side of (in my words)
"pre-sorted indexing".
Now, I have only one remaining question area: Isn't the forceMerge method the
only real benefit of UpgradeIndexMergePolicy? Is that purely for the Solr
optimize option, or is there some intent to surface it for users some other way
in Solr? Isn't it more of a one-time operation rather than something that
should be in place for all merge operations? Or is it so cheap if not used that
we should simply pre-configure it all the time?
> make Lucene's SortingMergePolicy and EarlyTerminatingSortingCollector
> configurable in Solr
> ------------------------------------------------------------------------------------------
>
> Key: SOLR-5730
> URL: https://issues.apache.org/jira/browse/SOLR-5730
> Project: Solr
> Issue Type: New Feature
> Reporter: Christine Poerschke
> Assignee: Christine Poerschke
> Priority: Minor
> Attachments: SOLR-5730-part1of2.patch, SOLR-5730-part1of2.patch,
> SOLR-5730-part2of2.patch, SOLR-5730-part2of2.patch
>
>
> *Example configuration (solrconfig.xml) - corresponding to latest attached
> patch:*
> {noformat}
> <sortMerges enable="true">
> <str name="sort">timestamp desc</str>
> </sortMerges>
> {noformat}
> *Example configuration (solrconfig.xml) - corresponding to current
> (work-in-progress master-solr-8621) SOLR-8621 efforts:*
> {noformat}
> -<mergePolicy class="TieredMergePolicy"/>
> +<mergePolicyFactory class="SortingMergePolicyFactory">
> + <str name="in">TieredMergePolicyFactory</str>
> + <str name="sort">timestamp desc</str>
> +</mergePolicyFactory>
> {noformat}
> *Example use (EarlyTerminatingSortingCollector):*
> {noformat}
> &sort=timestamp+desc&segmentTerminateEarly=true
> {noformat}
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