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https://issues.apache.org/jira/browse/SOLR-5730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128656#comment-15128656
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Hoss Man commented on SOLR-5730:
--------------------------------
I think the direction being taken in SOLR-8621 looks like a good idea in
general for better configuring/modeling the true state of things internally as
far as merge policies are concerned. I think it also makes sense to somewhat
put this issue (SOLR-5730) on hold until some of those plumbing related
questions are resolved.
ultimately, i suspect using SortingMergePolicy is an advanced enough option
that if it requires some non-trivial config then so be it -- we can document
what that config looks like and provide common recipes with clear instructions
of what key knobs/values users have to consider to use those recipes.
If, ultimately, we decide that the "full syntax" for specifying a merge policy
with SortingMergePolicy warpper is overly verbose for basic users, and we
_also_ want some simplified way for users to say "use whatever default (merge
policy) Solr thinks is best, but please sort docs on disk like this..." then
that can always be added as syntactic sugar later.
> 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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