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https://issues.apache.org/jira/browse/LUCENE-847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12525903
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Michael McCandless commented on LUCENE-847:
-------------------------------------------

OK, as a better test of ConcurrentMergeScheduler, and towards making it
the default merge scheduler, I tried making it the default in
IndexWriter and then ran all unit tests, and uncovered problems with
the current patch (notably how optimize works!).  So I'm working on an
new patch now....



> Factor merge policy out of IndexWriter
> --------------------------------------
>
>                 Key: LUCENE-847
>                 URL: https://issues.apache.org/jira/browse/LUCENE-847
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Steven Parkes
>            Assignee: Steven Parkes
>             Fix For: 2.3
>
>         Attachments: concurrentMerge.patch, LUCENE-847.patch.txt, 
> LUCENE-847.patch.txt, LUCENE-847.take3.patch, LUCENE-847.take4.patch, 
> LUCENE-847.take5.patch, LUCENE-847.txt
>
>
> If we factor the merge policy out of IndexWriter, we can make it pluggable, 
> making it possible for apps to choose a custom merge policy and for easier 
> experimenting with merge policy variants.

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