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https://issues.apache.org/jira/browse/SOLR-5730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15110679#comment-15110679
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Christine Poerschke commented on SOLR-5730:
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bq. ... i'm not really a fan of the 2 new disjoint top level config options ...
I agree that having a {{<useSortingMergePolicy>true</useSortingMergePolicy>}}
element in solrconfig.xml and a {{<mergeSortSpec>timestamp
desc</mergeSortSpec>}} element in schema.xml is tricky but personally am not
won over by either of the obvious two alternatives either:
*Alternative #1 solrconfig.xml element only:*
+ advantage: the element is co-located with the existing <mergePolicy> element
\- disadvantages:
* solrconfig.xml references schema.xml field names
* solr.search.SolrIndexSearcher would need (more) access to the
solr.update.SolrIndexConfig object \[implementation detail:
SolrIndexSearcher.buildAndRunCollectorChain needs to be able to pass the merge
policy sort to EarlyTerminatingSortingCollector but only one of the two
SolrIndexSearcher constructors currently takes an SolrIndexConfig argument.\]
*Alternative #2 schema.xml element only:*
+ advantage: the element uses solr field names defined in the same file
\- disadvantage: the presence or absence of an element in schema.xml has a side
effect on how the solrconfig.xml <mergePolicy> element is instantiated
*Alternative #3 perhaps there is another way?*
> 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-part2of2.patch
>
>
> *Example configuration (SortingMergePolicy):*
> solrconfig.xml
> {noformat}
> <useSortingMergePolicy>true</useSortingMergePolicy>
> {noformat}
> schema.xml
> {noformat}
> <mergeSortSpec>timestamp desc</mergeSortSpec>
> {noformat}
> *Example use (EarlyTerminatingSortingCollector):*
> {noformat}
> &sort=timestamp+desc&segmentTerminateEarly=true
> {noformat}
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