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From "Shai Erera (JIRA)" <>
Subject [jira] [Commented] (SOLR-8621) solrconfig.xml: deprecate/replace <mergePolicy> with <mergePolicyFactory>
Date Wed, 10 Feb 2016 13:20:18 GMT


Shai Erera commented on SOLR-8621:

Good catch, I just blindly moved that 'mergeFactor' in :). I'll remove it. I'd like to keep
the example though, since it's consistent with the rest of the commented out examples.

About {{SortingMergePolicyFactory}} and {{IndexSchema}}, I see that {{SortSpecParsing}} uses
the provided schema only to validate that the field exists in the schema. If we want to keep
that validity check, then let's continue with your proposal of passing {{IndexSchema}} to
the factory's ctor.

About this parsing logic, it also relies on request params, so perhaps factor out the parsing
logic to a utility that you can use? That utility can then also validate that the sort field
exists in the schema. I didn't review that method fully, but I hope it's doable.

> solrconfig.xml: deprecate/replace <mergePolicy> with <mergePolicyFactory>
> -------------------------------------------------------------------------
>                 Key: SOLR-8621
>                 URL:
>             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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