On 19.11.2015 05:19, Nick Childs wrote:
Tomcat Version: 6.0.39
Operating System: Server 2012 R2 Standard
Configuration: We are utilizing Tomcat as part of a Pentaho deployment - Tomcat
is utilized for Pentaho's Data Integration and Business Analytics services.
Description: We have a custom Deployment of Pentaho using PostgreSQL and Tomcat
Apache running within the current version of our proprietary Medical Imaging
software. The integration works well, but we have spent months struggling to
identify the cause of a major conflict between the PostgreSQL/Tomcat
integration and group policy client in windows domain environments. Whenever
the PostgreSQL and Tomcat Apache (Pentaho Data Integration) services are
running, we begin to see 1 hour + reboot times and gpupdate failures due to the
group policy client just hanging for long periods of time with no explanation.
If only Pentaho is running, no problem is experienced. If only Tomcat is
running, no problem is experienced - it is only when we have both
running/communicating the Group Policy updates begin to fail.
We have enabled all known debugging in Group Policy, PostgreSQL, Pentaho, and
Tomcat, performed xBootMgr traces, performed Process Monitor analysis, and
Packet Captures, but have been unable to determine the cause of the conflict.
We are also working with Microsoft, Pentaho, and PostgreSQL independently to
try and flush out the culprit. After spending weeks analyzing and reviewing our
development team's internal notes, I have become fairly confident that the root
cause of this problem is related to the way that we deployed Tomcat, and the
way that Tomcat/PostgreSQL communicate with each other, but I have not found
solid proof that actually indicates this yet.
I have learned a lot about how PostgreSQL/Tomcat are functioning in this
environment over the last week, but I am not part of the team that deployed
this, and am certainly not an expert on Pentaho, PostgreSQL, or Tomcat. I have
been collecting a list of debug error/warnings from the Tomcat logs over the
last few days (attached), and I am hoping someone who is an expert on this
stuff can possibly review this list of errors, provide an explanation/priority
for each, and answer the following questions:
1. Are there any known conflicts with Tomcat and GroupPolicy in Windows domain
environments? Required Configurations? Workarounds?
3. Are there any special debugging options or monitoring tools that we could
use to get more information about what Tomcat is doing during the time periods
that Group Policy Client is hung? The built-in logging is not helping us.
4. Do you have any suggestions or options that we can try to see if our
behavior changes?
Please let me know if there is any additional information I can provide to help.
Hi.
I don't know anything about the various non-Tomcat softwares you are mentioning, and just
a little bit about Tomcat.
But the one thing I see in your Tomcat logfile, is that there seem to be a lot of TCP
connection errors of the kind "(Connection refused. Check that the hostname and port are
correct and that the postmaster is accepting TCP/IP connections.)"
These seem to be related mostly to PostgreSQL.
Maybe there is a limit (in the PostgreSQL configuration) to how many connections it
accepts at the same time ? or maybe the PostgreSQL server is just overloaded ?
Anyway, I would check this first, because there is a chance that many of the other errors
which you are seeing are cascading down from there.
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