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Robb Kambic Unidata Program Center
Software Engineer III Univ. Corp for Atmospheric Research
rkambic@xxxxxxxxxxxxxxxx WWW: http://www.unidata.ucar.edu/
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---------- Forwarded message ----------
Date: Fri, 12 Nov 2004 16:19:43 -0700
From: Ben Domenico <bendomenico@xxxxxxxxx>
To: THREDDS Development List <thredds-dev@xxxxxxxxxxxxxxxx>
Subject: Fwd: Tomcat server hangs on RedHat systems - a possible solution
Hi,
I'm guessing that some of you have seen this note about problems with
the Tomcat server, but I thought I'd forward it anyway -- just in case
it has some bearing on the problems with catgen.
-- Ben
---------- Forwarded message ----------
From: Kevin O'Brien <kevin.m.o'brien@xxxxxxxx>
Date: Fri, 12 Nov 2004 14:02:14 -0800
Subject: Tomcat server hangs on RedHat systems - a possible solution
To: "las_users@xxxxxxxx" <las_users@xxxxxxxx>
If you are running LAS on a RedHat system, and you are fed up with
the tomcat server because you have to constantly restart it, there may
be a simple solution.
We have had extensive problems with the Tomcat server hanging on our
RedHat 9 systems. It didn't seem to matter which version of the
tomcat 5 server we were using - we saw consistent hangs with all of
them. Searching through the web, I ran across some documentation that
described the problem. It turns out that RH 9 uses a new form of
threading, which apparently was incompatible with the tomcat 5
servers. To stop the tomcat server from hanging, it is necessary to
revert to an older form of threading.
To do this, insert the following into the tomcat/bin/catalina.sh file:
LD_ASSUME_KERNEL=2.2.5
export LD_ASSUME_KERNEL
And restart the tomcat server. We've done this here at PMEL and
haven't had to restart the tomcat server in two weeks.
The documentation indicates that this is only effective for RH9
systems, but I haven't been able to verify that because we only have
RH9 systems.
This is also documented in our FAQ-O-Matic documentation at
http://ferret.pmel.noaa.gov/cgi-bin/LASdoc?auth=ckca0339544dae0aa26a0e690396b7d40a&file=65
Kevin
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Kevin O'Brien UW/JISAO Research Scientist NOAA/PMEL/TMAP 206-526-6751
http://tmap.pmel.noaa.gov
