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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 33807] New: - When thread pool fills tomcat stops processing requests.
Date Wed, 02 Mar 2005 13:07:31 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=33807

           Summary: When thread pool fills tomcat stops processing requests.
           Product: Tomcat 5
           Version: 5.5.4
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: wojtek@brandlay.com


I'm running 5.5.4 with sun jdk 1.4 (but this problem exists probably with every
jdk version and with many tomcat versions).  I have a very loaded site.  When I
restart tomcat it gets immediately hit by hundreds of clients.  The load goes up
and processing requests starts taking a very long time.  As a result all the
worker threads become busy and I get the following message in the log:

Mar 1, 2005 3:33:31 PM org.apache.tomcat.util.threads.ThreadPool logFull
SEVERE: All threads (900) are currently busy, waiting. Increase maxThreads (900)
or check the servlet status

After this tomcat stops processing new requests.  I believe that the correct
behaviour would be to continue processing requests with the existing threads and
processing new as the threads become free.  But in this case, as I said tomcat
simply stops accepting new connections and 'hangs' not doing anything.

Increasing max threads seems to be a workaround but not a good one.

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