You are viewing a plain text version of this content. The canonical link for it is here.
Posted to users@tomcat.apache.org by Vinay Singh <vs...@crunchtime.com> on 2019/08/19 17:27:23 UTC

CPU gets pegged - Problem with java.util.zip.ZStreamRef 

We are seeing this intermittent issue in production. The CPU gets pegged at 50% (2 core CPU) randomly and it never comes back. Only option is to restart the server. This is how CPU appears from Dynatrace
https://i.stack.imgur.com/7zxZW.png
This is how the thread dump looks when we analyzed through dynatrace.
https://i.stack.imgur.com/6YOm1.png


This happens randomly on any day of the week and we could not find a pattern.
It could happen when servers are under heavy load or not doing much.

I am not 100% if this is a tomcat defect. Since the stream trace is from org.apache.coyote.http11.filters.GzipOutputFilter, does tomcat compression has any role to play here ?

We are doing compression via tomcat, not load balancer.
This is our compression settings in server.xml

  <Connector port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol"
        maxPostSize="10485760" URIEncoding="UTF-8"
        socket.appReadBufSize="1024"
        socket.appWriteBufSize="1024"
        selectorPool.maxSelectors="5000"
        compression="on"
        compressableMimeType="text/html,text/xml,text/plain,text/css,text/javascript,text/json,application/x-javascript,application/javascript,application/json"
        SSLEnabled="false"
        scheme="https"
        secure="true"
        proxyPort="443"
        maxThreads="500"
        relaxedPathChars="|"
        relaxedQueryChars="|"
    />
    <Connector port="8081" protocol="org.apache.coyote.http11.Http11NioProtocol"
        maxPostSize="10485760" URIEncoding="UTF-8"
        socket.appReadBufSize="1024"
        socket.appWriteBufSize="1024"
        selectorPool.maxSelectors="5000"
        compression="on"
        compressableMimeType="text/html,text/xml,text/plain,text/css,text/javascript,text/json,application/x-javascript,application/javascript,application/json"
        SSLEnabled="false"
        scheme="http"
        secure="false"
        proxyPort="8081"
        relaxedPathChars="|"
        relaxedQueryChars="|"
    />


Thanks for looking at the problem

Vinay

Re: CPU gets pegged - Problem with java.util.zip.ZStreamRef

Posted by Mark Thomas <ma...@apache.org>.
On August 19, 2019 5:27:23 PM UTC, Vinay Singh <vs...@crunchtime.com> wrote:
>We are seeing this intermittent issue in production. The CPU gets
>pegged at 50% (2 core CPU) randomly and it never comes back. Only
>option is to restart the server. This is how CPU appears from Dynatrace
>https://i.stack.imgur.com/7zxZW.png
>This is how the thread dump looks when we analyzed through dynatrace.
>https://i.stack.imgur.com/6YOm1.png
>
>
>This happens randomly on any day of the week and we could not find a
>pattern.
>It could happen when servers are under heavy load or not doing much.
>
>I am not 100% if this is a tomcat defect. Since the stream trace is
>from org.apache.coyote.http11.filters.GzipOutputFilter, does tomcat
>compression has any role to play here ?

Java version?

Tomcat version? 

OS details?

Does a particular resource trigger this?

There have been issues in the past with the zip implementation in the JRE. As always, what we really need is a reproducible test case 

Mark


>
>We are doing compression via tomcat, not load balancer.
>This is our compression settings in server.xml
>
><Connector port="8080"
>protocol="org.apache.coyote.http11.Http11NioProtocol"
>        maxPostSize="10485760" URIEncoding="UTF-8"
>        socket.appReadBufSize="1024"
>        socket.appWriteBufSize="1024"
>        selectorPool.maxSelectors="5000"
>        compression="on"
>compressableMimeType="text/html,text/xml,text/plain,text/css,text/javascript,text/json,application/x-javascript,application/javascript,application/json"
>        SSLEnabled="false"
>        scheme="https"
>        secure="true"
>        proxyPort="443"
>        maxThreads="500"
>        relaxedPathChars="|"
>        relaxedQueryChars="|"
>    />
><Connector port="8081"
>protocol="org.apache.coyote.http11.Http11NioProtocol"
>        maxPostSize="10485760" URIEncoding="UTF-8"
>        socket.appReadBufSize="1024"
>        socket.appWriteBufSize="1024"
>        selectorPool.maxSelectors="5000"
>        compression="on"
>compressableMimeType="text/html,text/xml,text/plain,text/css,text/javascript,text/json,application/x-javascript,application/javascript,application/json"
>        SSLEnabled="false"
>        scheme="http"
>        secure="false"
>        proxyPort="8081"
>        relaxedPathChars="|"
>        relaxedQueryChars="|"
>    />
>
>
>Thanks for looking at the problem
>
>Vinay


---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org