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From Rafał Kuć <>
Subject Re: Severe QTime issues to do with updates
Date Mon, 10 Aug 2009 10:36:43 GMT

   First  of all I would suggest Solr user mailing list for a question
like this. Anyway, we were experiencing similar problem with the older
version of Solr 1.4 - in random situations, after index update on slaves
we  were  getting  response  times  from 1 to 20 seconds. After trying
everything  from  I/O  analysis  to  GC logging we updated SOLR to the
newest version available and that solved response time issues.

   Hope that helps.

 Rafał Kuć

> Hey,
> I've recently noticed that there is a very large spike in the QTime for
> nodes serving queries, immediately after snappulling and snapinstalling.
> The numbers i'm seeing there are obviously some kind of
> lock-contention/concurrency issue, as I've monitored iostat/sar and its not
> a disk IO
> issue ( all the index is still mostly in the os caches, as is also
> noticeable in the snappuller.log which runs very fast - the incremental
> update to the
> lucene index is minimal).
> I'm using a strong machine (16GB 2xQuadCore, CentOS5) for this and from all
> monitoring the CPU/Disk IO seems minimal through-out the day.
> The update runs every 10 minutes, takes about 200seconds to complete (with
> my current autoWarm settings)., and the index size
> is about 20million documents (~6GB). queries/warmup involve mostly some
> pre-fixed set of filters and facets.

> I'm using a nightly build of solr from few months back ( nightly exported -
> yonik - 2009-01-11 08:05:52 )  which should already have
> the benefits of readonlyindexreader, NIOFS, UnInvertedIndex and
> ConcurrentLRUCache (for filterCache).
> I've read a related thread a guy called oleg posted (
> , but did not see the thread concluded with any definite conclusion.

> Please advise!

> Best regards,
> -Chak

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