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https://issues.apache.org/jira/browse/SOLR-8621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15140676#comment-15140676
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Christine Poerschke commented on SOLR-8621:
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bq. ... what does SortingMergePolicyFactory need from IndexSchema that it
cannot create on its own? It already receives the sort-by fields and order in
the config, all it needs to do is to create a Sort class. What does it get from
IndexSchema then?
The plan so far was that the sort would be specified as a string e.g.
{code}
<str name="sort">popularity desc, timestamp desc</str>
{code} in the same way as when a {{&sort=...}} parameter is passed as part of a
select request. The solrconfig.xml SortingMergePolicyFactory's sort string is
then parsed using the essentially the same methods used for parsing the sort
parameter in the select request e.g. [SortSpecParsing.parseSortSpec(sortArg,
schema)|https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/search/SortSpecParsing.java#L84]
- does that kind of make sense?
bq. ... It already receives the sort-by fields and order in the config, all it
needs to do is to create a Sort class ...
Are you saying that perhaps there is a way to create the Sort class without use
of {{IndexSchema}} if the solrconfig.xml sort-by fields and order are provided
in a structured way that requires no parsing? Interesting idea, let me look
into that a little further.
> solrconfig.xml: deprecate/replace <mergePolicy> with <mergePolicyFactory>
> -------------------------------------------------------------------------
>
> Key: SOLR-8621
> URL: https://issues.apache.org/jira/browse/SOLR-8621
> Project: Solr
> Issue Type: Task
> Reporter: Christine Poerschke
> Assignee: Christine Poerschke
> Priority: Blocker
> Fix For: 5.5, master
>
> Attachments: SOLR-8621-example_contrib_configs.patch,
> SOLR-8621.patch, explicit-merge-auto-set.patch
>
>
> *<mergePolicyFactory> end-user benefits:*
> * Lucene's UpgradeIndexMergePolicy can be configured in Solr
> * (with SOLR-5730) Lucene's SortingMergePolicy can be configured in Solr
> * customisability: arbitrary merge policies including wrapping/nested merge
> policies can be created and configured
> *(proposed) roadmap:*
> * solr 5.5 introduces <mergePolicyFactory> support
> * solr 5.5(\?) deprecates (but maintains) <mergePolicy> support
> * solr 6.0(\?) removes <mergePolicy> support
> +work-in-progress summary:+
> * main code changes have been committed to master and branch_5x
> * {color:red}further small code change required:{color} MergePolicyFactory
> constructor or MergePolicyFactory.getMergePolicy method to take IndexSchema
> argument (e.g. for use by SortingMergePolicyFactory being added under related
> SOLR-5730)
> * Solr Reference Guide changes (directly in Confluence?)
> * changes to remaining solrconfig.xml
> ** solr/core/src/test-files/solr/collection1/conf - Christine
> ** solr/contrib
> ** solr/example
> +open question:+
> * Do we want to error if luceneMatchVersion >= 5.5 and deprecated
> mergePolicy/mergeFactor/maxMergeDocs are used? See [~hossman]'s comment on
> Feb 1st. The code as-is permits mergePolicy irrespective of
> luceneMatchVersion, I think.
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