Hi all:
Aggregations arent supposed to leave files open. If they are, thats a bug.
The number of open files should typically be less than 1000, no matter how big
your aggregations are. It is dependent on the file cache sizes, see:
http://www.unidata.ucar.edu/software/thredds/v4.4/tds/reference/ThreddsConfigXMLFile.html#FileCache
So if you are seeing lots of open files, we have a file leak i think. You can
verify by turning your file cache to 0 or very low (10?). Then watch the pfiles
output to see whats happening.
John
On 10/24/2013 3:15 PM, Kevin Manross wrote:
>
> 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
>>>
>>> _______________________________________________
>>> thredds mailing list
>>> thredds@xxxxxxxxxxxxxxxx
>>> For list information or to unsubscribe, visit:
>>> http://www.unidata.ucar.edu/mailing_lists/
>
> --
> Kevin Manross
> NCAR/CISL/Data Support Section
> Phone: (303)-497-1218
> Email:manross@xxxxxxxx <mailto:manross@xxxxxxxx>
> Web:http://rda.ucar.edu
>
>
> _______________________________________________
> thredds mailing list
> thredds@xxxxxxxxxxxxxxxx
> For list information or to unsubscribe, visit:
> http://www.unidata.ucar.edu/mailing_lists/
>
