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https://issues.apache.org/jira/browse/SOLR-8621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143618#comment-15143618
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Shai Erera commented on SOLR-8621:
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[~cpoerschke] these look good, so +1 to merge to 5x. I agree that we're done w/
this issue here. We can separately take care of SOLR-8674 and SOLR-8668. I
enjoyed this collaboration, thank you very much for such a fun and positive
experience!
> 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
> Fix For: 5.5, master
>
> Attachments: SOLR-8621-example_contrib_configs.patch,
> 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 left-to-do summary:+
> * Solr Reference Guide changes (directly in Confluence?)
> * changes to remaining solrconfig.xml
> ** solr/core/src/test-files/solr/collection1/conf - in SOLR-8674
> ** solr/server/solr/configsets - master committed, branch_5x/branch_5_5
> cherry-pick to follow
> * WrapperMergePolicyFactory.getMergePolicyInstance method - master
> committed, branch_5x/branch_5_5 cherry-pick to follow
> * RandomForceMergePolicyFactory - master committed, branch_5x/branch_5_5
> cherry-pick to follow
> +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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