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https://issues.apache.org/jira/browse/LUCENE-847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527239
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Ning Li commented on LUCENE-847:
--------------------------------

Hmm, it's actually possible to have concurrent merges with SerialMergeScheduler.

Making SerialMergeScheduler.merge synchronize on SerialMergeScheduler will 
serialize all merges. A merge can still be concurrent with a ram flush.

Making SerialMergeScheduler.merge synchronize on IndexWriter will serialize all 
merges and ram flushes.

> 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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