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https://issues.apache.org/jira/browse/SOLR-8621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15127916#comment-15127916
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Shai Erera commented on SOLR-8621:
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[~cpoerschke] about the commit, I have few comments:
* {{MergePolicyFactory}}, IMO, should belong to Solr. I don't see it being used
by Lucene users, as they already construct {{IndexWriterConfig}} which takes a
{{MergePolicy}} instance. The factory, again IMO, is useful in Solr-land,
because Solr is configured from a file and therefore being able to construct an
MP from a set of properties will be useful to Solr users.
* I don't fully get the purpose of {{MergePolicyFactoryHelper}}. Did you create
that abstraction so we can use it in Solr? If we move MPF to Solr, I think we
can get rid of it? Its only purpose as I can tell is to create an instance of
an MP, but I thought that's what the factory will do?
* {{SimpleMergePolicyFactory}} is what I had in mind for the simple MPs. I
wonder if we took the actual MPs class name in the properties, we wouldn't need
{{TieredMPF}}, and will also simply support {{LogMP}}. What do you think? The
XML element would look like:
{code}
<mergePolicyFactory class="solr.SimpleMergePolicyFactory">
<str name="class">solr.TieredMergePolicy</str>
...
</mergePolicyFactory>
{code}
What do you think?
* Is it OK if I make some changes to the code and push to the branch, or are
you actively working on it?
> 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
>
> *<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 git branch:+
> [master-solr-8621|https://github.com/apache/lucene-solr/tree/master-solr-8621]
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