This is very helpful Mike - thank you very much for the insight and your
experience.
This will be useful information for requesting the ulimit increase from
our sysadmins!
-kevin.
On 10/24/13 3:09 PM, Michael McDonald wrote:
Kevin,
We needed to add a script to "/etc/profile.d" that increases the stock
CentOS/RHEL 6.x number of open files. Change $USER == "tomcat" to
whatever you run tomcat/apache as (see below). Also assumes that the
user is running the sh/bash shell.
# cat /etc/profile.d/thredds.sh
export TOMCAT_HOME="/usr/share/tomcat6"
if [ $USER == "tomcat" ]; then ulimit -n 1000000; fi
Our THREDDS servers providing only OPENDAP requests are averaging 40k
open files. Our THREDDS servers providing only NCSS requests are
averaging 15k open files. We have a lot of files in some of our hycom
datasets.
/mike
On Thu, Oct 24, 2013 at 1:50 PM, Kevin Manross <manross@xxxxxxxx> wrote:
Hi there,
I am trying to aggregate netcdf files for some rather large datasets with
tomcat6.0.36/TDS4.19 - 20131008.1358 and am running into a "Too many open
files" error.
My catalog scan is:
<dataset name="ASR 30 km 2d surface analysis"
ID="ds631.0_anl_2d-AGG"
urlPath="ds631.0/9/best"
harvest="true">
<serviceName>all</serviceName>
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
<aggregation dimName="time" type="Union">
<scan location="/glade/p/rda/data/ds631.0/asr30km.anl.2d/"
suffix=".nc" subdirs="false"/>
</aggregation>
</netcdf>
</dataset>
which contains about 4020 files and totals 470G.
The message that the server sends when trying to access the OPeNDAP service
is:
Error {
code = 404;
message =
"/glade/p/rda/data/ds631.0/asr30km.anl.2d/asr30km.anl.2d.20010619.nc (Too
many open files)";
};
When trying the CdmRemote service catalina.out repeatedly reads:
Oct 24, 2013 11:20:39 AM org.apache.jk.common.ChannelSocket
acceptConnections
WARNING: Exception executing accept
java.net.SocketException: Too many open files
at java.net.PlainSocketImpl.socketAccept(Native Method)
at
java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:375)
at java.net.ServerSocket.implAccept(ServerSocket.java:478)
at java.net.ServerSocket.accept(ServerSocket.java:446)
at org.apache.jk.common.ChannelSocket.accept(ChannelSocket.java:311)
at
org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:668)
at
org.apache.jk.common.ChannelSocket$SocketAcceptor.runIt(ChannelSocket.java:879)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:679)
The cache settings in my threddsConfig.xml are the default settings.
Have I overlooked something?
-kevin.
--
Kevin Manross
NCAR/CISL/Data Support Section
Phone: (303)-497-1218
Email:manross@xxxxxxxx
Web:http://rda.ucar.edu
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--
Kevin Manross
NCAR/CISL/Data Support Section
Phone: (303)-497-1218
Email:manross@xxxxxxxx <mailto:manross@xxxxxxxx>
Web:http://rda.ucar.edu
