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On 6/20/20 11:51, Ayub Khan wrote:
> Sorry we are using  8.0.32 version of tomcat.
> below is the configuration:
> Server version: Apache Tomcat/8.0.32 (Ubuntu) Server built:   Jan
> 24 2020 16:24:30 UTC Server number: OS Name:
> Linux OS Version:     4.4.0-1087-aws Architecture:   amd64 JVM
> Version:    1.8.0_181-b13 JVM Vendor:     Oracle Corporation
> I use the below command to check the file descriptors:
> watch "sudo ls /proc/`cat /var/run/tomcat8.pid`/fd/ | wc -l"

So you know there is some kind of increase in file-handle use, but you
don't know what types of file handles are increasing, right?

Can you try to find out which kinds of file handles are increasing?

I have a sneaking suspicion that it's your database connections and
not actually files open on the disk.

Are you using a database connection pool? If not, you should really
use one and limit the number of connections to something sane. If you
are using one, are you monitoring it to see how many connections are
actually being used? Are you sure you are using proper resource
management[1]? Even a single code-path that leaks connections can leak
them quickly under load.

> When there an issue related to broken files, this value keeps
> increasing, the only way to bring it down is to remove vm instance
> from AWS load balancer.> Which version of tomcat should I install
> ?

Tomcat 8.0.x hasn't been supported since its last release on 29 June
2018. That was 8.0.53. Your release is from 8 February 2016 and is
dangerously out of date (unless you are using the Ubuntu-packaged
version, in which case I hope they kept-up with security patches thee
past 4 years).

- -chris

> On Sat, Jun 20, 2020 at 6:28 PM Christopher Schultz <
> ch...@christopherschultz.net> wrote:
> Ayub,
> On 6/19/20 16:46, Ayub Khan wrote:
>>>> tomcat 8.5 broken pipe increases open files on ubuntu AWS
> Which exact version of Tomcat 8.5? If you aren't running the
> latest version (8.5.56), please upgrade and re-test.
>>>> If there is slow response from db I see this stack trace and
>>>> the open files goes high and the only way to open files go
>>>> down is to remove the instance from Amazon load balancer.
>>>> Is there a way to keep the open files low even when Broken
>>>> pipe error is thrown ?
> What is your evidence that file handles are being left open?
> Which file handles are being left open?
> -chris
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