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https://issues.apache.org/jira/browse/LUCENE-3023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028327#comment-13028327
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Michael McCandless commented on LUCENE-3023:
--------------------------------------------
This cutover to concurrent flushing (DWPT) produces astounding
increases in indexing throughput:
http://people.apache.org/~mikemccand/lucenebench/indexing.html
186 GB plain text per hour (from 101 GB/hour the day before)!!!
It's not every day you see an 84% jump in indexing throughput! Wow.
This is on a machine that has substantial CPU+IO concurrency, ie, it
was bottlenecked by our non-concurrent flush.
Also, I can now tune up the IW settings I use in those nightly
benchmarks; it's now 6 threads and "only" 512 MB RAM buffer. I'll
wait a few days and then do that.
Looks like a few queries got a bit slower... I suspect this is because
the index segment count has changed. Before concurrent flushing it
was this:
{noformat}
36(4.0):C4977400 _69(4.0):C4977400 _9c(4.0):C4977400 _cf(4.0):C4977400
_fi(4.0):C4977400 _fq(4.0):C497740 _g1(4.0):C497740 _gc(4.0):C497740
_gn(4.0):C497740 _gy(4.0):C497740 _gx(4.0):C49774 _gz(4.0):C49774
_h0(4.0):C49774 _h1(4.0):C49774 _h2(4.0):C49774 _h3(4.0):C468
{noformat}
After concurrent flushing:
{noformat}
_3d(4.0):C4977400 _6h(4.0):C4977400 _9j(4.0):C4977400 _cn(4.0):C4977400
_fq(4.0):C4977400 _fu(4.0):C497740 _g6(4.0):C497740 _gh(4.0):C497740
_gs(4.0):C497740 _h2(4.0):C497740 _gy(4.0):C49774 _gz(4.0):C49774
_h0(4.0):C49774 _h5(4.0):C4105 _1(4.0):C2627 _h4(4.0):C16331 _h3(4.0):C28728
_h1(4.0):C48225
{noformat}
So we have 2 extra segments... it's interesting how this affects some
queries but not others.
> Land DWPT on trunk
> ------------------
>
> Key: LUCENE-3023
> URL: https://issues.apache.org/jira/browse/LUCENE-3023
> Project: Lucene - Java
> Issue Type: Task
> Affects Versions: CSF branch, 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-3023-quicksort-reincarnation.patch,
> LUCENE-3023-svn-diff.patch, LUCENE-3023-ws-changes.patch, LUCENE-3023.patch,
> LUCENE-3023.patch, LUCENE-3023.patch, LUCENE-3023.patch,
> LUCENE-3023_CHANGES.patch, LUCENE-3023_CHANGES.patch,
> LUCENE-3023_iw_iwc_jdoc.patch, LUCENE-3023_simonw_review.patch,
> LUCENE-3023_svndiff.patch, LUCENE-3023_svndiff.patch, diffMccand.py,
> diffSources.patch, diffSources.patch, realtime-TestAddIndexes-3.txt,
> realtime-TestAddIndexes-5.txt,
> realtime-TestIndexWriterExceptions-assert-6.txt,
> realtime-TestIndexWriterExceptions-npe-1.txt,
> realtime-TestIndexWriterExceptions-npe-2.txt,
> realtime-TestIndexWriterExceptions-npe-4.txt,
> realtime-TestOmitTf-corrupt-0.txt
>
>
> With LUCENE-2956 we have resolved the last remaining issue for LUCENE-2324 so
> we can proceed landing the DWPT development on trunk soon. I think one of the
> bigger issues here is to make sure that all JavaDocs for IW etc. are still
> correct though. I will start going through that first.
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