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https://issues.apache.org/jira/browse/LUCENE-847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527300
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Mark Miller commented on LUCENE-847:
------------------------------------

Looks like some anomalous tests. Last night I checked twice, but today results 
are: 58 to 48 in favor of Concurrent. I am going to assume my first results 
where invalid. Sorry for the noise and thanks for the great patch. Has passed 
quite a few stress tests I run on my app without any problems so far. Do both 
merge policies allow for a closer to constant add time or is it just the 
Concurrent policy?

> 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.take6.patch, LUCENE-847.take7.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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