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https://issues.apache.org/jira/browse/LUCENE-847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12525802
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Michael McCandless commented on LUCENE-847:
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> Is there any reason not to make ConcurrentMergeScheduler the default too
> after this is committed?
Good question. The only downsides I can think of are:
* It's all fresh code so until we let it "age" some, it's a higher
risk that something broke. That said there is decent unit test
coverage for it and these unit tests did find some sneaky issues
(which I fixed!).
* It only actually helps on machines that have some concurrency.
But in this case we are largely talking about IO concurrent w/ CPU
which nearly all machines have I think.
I think the benefits are sizable:
* Good performance gains (25% speedup of net indexing time for all
of Wikipedia content -- details in LUCENE-870)
* Trivial way to leverage concurrency (ie you don't need to manage
your own threads).
* No more unexpected long pauses on certain addDocument calls.
So I think it would make sense to make it the default. I'll include
that in the new issue for changing defaults in IndexWriter.
> 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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