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From Samarendra Pratap <samarz...@gmail.com>
Subject Number of threads increased after restart
Date Tue, 29 Nov 2011 11:51:07 GMT
Hi,
 I restarted solr server with minor configuration changes and I/O and load
on server increased a lot.

Details:-
Solr version: 3.4
Jetty version: 6.1
Index Size: 30 GB
Total document: 14.6 mn
Request / second :20 (in day time)
Last restart: 15 days ago
Open threads: 50 - 60 (at any moment)

A few days back we had swapped the indexes through the url based parameter
(action=reload). Yesterday night we made two changes to the system.
 1. set 'persistent="true"' in solr.xml (this is now reverted back)
 2. created a "work" directory under the jetty home (as per
https://issues.apache.org/jira/browse/SOLR-118)

 and restarted the jetty to let the changes take effect.

 Since the restart of yesterday the number of threads are crossing 100 many
times, leading to increased load on server. I made sure the correct core is
loaded and other configuration files are also fine. I am out of reasons to
explain this.

Any idea what could have happened? or how can I debug to optimize it?

Current jetty thread pool setting is
      <New class="org.mortbay.thread.QueuedThreadPool">
        <Set name="minThreads">10</Set>
        <Set name="maxThreads">10000</Set>
        <Set name="lowThreads">20</Set>
      </New>

Rate of requests is similar to other days.


-- 
Regards,
Samar

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