Jetty configuration is faulty with many cores & simultaneous requests
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                 Key: SOLR-1941
                 URL: https://issues.apache.org/jira/browse/SOLR-1941
             Project: Solr
          Issue Type: Bug
    Affects Versions: 3.1
            Reporter: David Smiley


There is a problem with the default configuration of Jetty in the Solr trunk 
release (not present in Solr 1.4 and prior).  There is a difference in the 
jetty configuration which is for the latest Solr to use the QueuedThreadPool 
(as seen in jetty.xml).  Previously, it had used a BoundedThreadPool 
implementation that I've heard is considered deprecated presently.  I have a 
multi-core setup where Jetty is serving up lots of Solr cores 9+ and when our 
client does a distributed search (3 of them at a time actually), it triggers a 
condition in which the query takes 50 plus seconds to respond.  During this 
time, the machine is effectively idle, seemingly waiting for something.  To fix 
this, go back to the former BoundedThreadPool implementation or don't use 
Jetty.  FWIW this has triggered us to swtich to Tomcat. 

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