On 09/01/2024 10:11, Vaidya, Omkar wrote:
Hi Mark,
Thanks for the response. For mainly related to our Thingworx IOT-based
application, we are using the Tomcat 9.0.62 server. So for that, we are getting
zombie or defunct processes.
"Please provide the steps you used to recreate this issue in a clean installation of a
standalone Tomcat instance." -> So for this, We have executed our installer, which
itself installs the Tomcat server. So, there are no manual steps that we ask the user to
execute.
That is not a clean installation of a standalone Tomcat. That is your
installer which could, frankly, be doing anything.
Your original post claimed that this issue was reproducible on a
standalone Tomcat installation. You need to provide details of how to
reproduce this on a clean standalone Tomcat installation - i.e. starting
with an installer provided by the ASF.
As per the previous response, "A default Tomcat install does not create parent and
child processes, so zombie processes cannot occur." -> So we have raised a support
case with Tomcat to just understand the reason why defunct processes are created.
Is anybody already raised case similar to defunct or related to zombie
processes. If yes, can you please share which resolution you have provided to
them to prevent creation of those.
This is open source support, provided by volunteers, for free. Not a
commercial support agreement. If you want a commercial support agreement
then there are plenty of vendors offering them (of varying quality). And
you'll need to pay for it.
So far, you have claimed a problem exists without providing any evidence
to back up that claim.
You need to provide the steps to re-create the problem from a clean
installation of a current Tomcat package provided by the ASF.
Given that the issue is with zombie process (which require parent/child
process) and that a standard Tomcat installation is a single process
that never forks any children, this currently looks like something that
is not a Tomcat issue.
At this point the onus is on you to provide the steps necessary for
someone on this list to recreate the problem you are seeing starting
from a Tomcat distribution downloaded from tomcat.apache.org
Mark
Thanks,
Omkar V.
-----Original Message-----
From: Mark Thomas <ma...@apache.org>
Sent: Friday, January 5, 2024 6:00 PM
To: users@tomcat.apache.org
Subject: Re: Regarding Tomcat is creating the zombie processes
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You will need to provide more details.
A default Tomcat install does not create parent and child processes so zombie
processes cannot occur.
I'll also note that zombie process do not consume system resources (apart from
a process ID).
Please provide the steps you used to recreate this issue in a clean
installation of a standalone Tomcat instance.
Mark
On 05/01/2024 09:48, Vaidya, Omkar wrote:
Adding information -
Tomcat Version - 9.0.62
Platform - Linux Platform
From: Vaidya, Omkar <ovai...@ptc.com>
Sent: Friday, January 5, 2024 3:15 PM
To: users@tomcat.apache.org
Cc: Shriwardhankar, Varun <vshriwardhan...@ptc.com>
Subject: Regarding Tomcat is creating the zombie processes
Hi Team,
This is regarding like we have one customer issue where on Linux platform, we
have configured our IOT-application (Thingworx), which is using Tomcat as a
server.
So we are able to identify that even when we remove our application, Tomcat is
creating a zombie (defunct) process, which is creating 200+ processes under the
process table, which ultimately occupy all the OS resources and the application
goes in a hung state. This issue is also reproducible on the Standalone Tomcat
server also.
There are two scenarios mentioned below -
1. If this is relatable to Tomcat can you please suggest any article
or documentation so that we can stop zombie process creation, if this is a
known issue or there is only way to clear zombie (defunct) process from
Processes table of linux.
2. Also, let us know if this is a Operating System specific issue
like as it is reproducible only on Linux, So Linux os is the thing that creates
the zombie (defunct) processes?
we are eagerly waiting for the response.
Thanks,
Omkar Vaidya.
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