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https://issues.apache.org/jira/browse/LUCENE-847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527258
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Michael McCandless commented on LUCENE-847:
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> Hmm, it's actually possible to have concurrent merges with
> SerialMergeScheduler.
This was actually intentional: I thought it fine if the application is
sending multiple threads into IndexWriter to allow merges to run
concurrently. Because, the application can always back down to a
single thread to get everything serialized if that's really required?
> 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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