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From "Christine Poerschke (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-8621) solrconfig.xml: deprecate/replace <mergePolicy> with <mergePolicyFactory>
Date Tue, 09 Feb 2016 09:53:18 GMT

    [ https://issues.apache.org/jira/browse/SOLR-8621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15138669#comment-15138669
] 

Christine Poerschke commented on SOLR-8621:
-------------------------------------------

[~elyograg] - It's the master-solr-8621 i.e. working branch https://git1-us-west.apache.org/repos/asf?p=lucene-solr.git;a=commitdiff;h=8ec2c844
that you refer to I think?

bq. ... maxMergeAtOnce and segmentsPerTier value of 42 ...

My intention was to communicate that users with an existing {{<mergeFactor>}} or {{<maxMergeDocs>}}
setting likely need to add an equivalent element to the {{<mergePolicyFactory>}} element.
Using 42 as an example value was clearly distracting, I will use ?? instead then.

bq. ... maxMergeAtOnce ... maxMergeAtOnceExplicit ...

Interesting point about the alignment or otherwise of these values. Yes, that sounds worthy
of its own LUCENE issue.

> 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
>         Attachments: 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 git branch:+ [master-solr-8621|https://github.com/apache/lucene-solr/tree/master-solr-8621]



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