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https://issues.apache.org/jira/browse/SOLR-5730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128698#comment-15128698
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Shai Erera commented on SOLR-5730:
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[~hossman], this issue is now on hold until we finish with SOLR-8621 (see
[~cpoerschke] earlier comment).
[~jkrupan] the intention of SOLR-8621 and this issue is to allow users to
define compound merge policies in {{solrconfig.xml}} with ease. Currently, it's
impossible and if you want to use something like {{UpgradeIndexMergePolicy}},
you have to create your own MP class which will delegate internally to
{{UpgradeIndexMP}}. For users who still want to define simple merge policies
like {{TieredMergePolicy}}, the structure in the XML will not be much
different. Instead of:
{code}
<mergePolicy class="org.apache.lucene.index.TieredMergePolicy">
<int name="segmentsPerTier">42</int>
</mergePolicy>
{code}
They will need to specify
{code}
<mergePolicyFactory class="org.apache.solr.index.TieredMergePolicyFactory">
<int name="segmentsPerTier">42</int>
</mergePolicy>
{code}
The factory allows more advanced users to create whatever MP they want, rather
easily. Also, with this change, we deprecate some settings that are now defined
globally (like _mergeFactor_), and move them inside the
{{<mergePolicyFactory>}} section, where they belong.
Hope this clarifies it better.
> 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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