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

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

 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>

Rate of requests is similar to other days.


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