Re: Why does Tomcat take so long to start? how can I monitor status?

2014-01-16 Thread Christopher Schultz 
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Dan,

On 1/16/14, 3:41 PM, Daniel Mikusa wrote:
> On Jan 16, 2014, at 3:04 PM, Bradley Rogers
>  wrote:
> 
>> I have an application where Tomcat under Centos linux takes about
>> 4 minutes to be "online" from the time it starts.
> 
> My initial thought is that it's probably the application.  This is
> true most of the time.  Occasionally there can be JAR scanning
> issues though or an issue with entropy.  See here for more info.
> 
> https://wiki.apache.org/tomcat/HowTo/FasterStartUp
> 
>> i dont know what its doing but wonder if there is a way to ping
>> something in the tomcat to check status?
> 
> My first thought would be to just watch the logs (increasing the
> log levels if necessary) and see what it's doing.  If it sits for a
> long time in one place or you see no output, take a few thread
> dump, 10 - 15 seconds apart (kill -3 ) and investigate
> further.

I don't like using kill -3 because the thread dump goes to stdout
(usually catalina.out, kinda polluting it). I like using "jstack"
better because it goes to the terminal running jstack and not to the
JVM's stdout.

- -chris
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Re: Why does Tomcat take so long to start? how can I monitor status?

2014-01-16 Thread Daniel Mikusa 
On Jan 16, 2014, at 3:04 PM, Bradley Rogers  
wrote:

> I have an application where Tomcat under Centos linux takes about 4 minutes
> to be "online" from the time it starts.

My initial thought is that it's probably the application.  This is true most of 
the time.  Occasionally there can be JAR scanning issues though or an issue 
with entropy.  See here for more info.

  https://wiki.apache.org/tomcat/HowTo/FasterStartUp

>  i dont know what its doing but wonder if there is a way to ping something in 
> the tomcat to check status?

My first thought would be to just watch the logs (increasing the log levels if 
necessary) and see what it's doing.  If it sits for a long time in one place or 
you see no output, take a few thread dump, 10 - 15 seconds apart (kill -3 
) and investigate further.

Dan


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Why does Tomcat take so long to start? how can I monitor status?

2014-01-16 Thread Bradley Rogers 
I have an application where Tomcat under Centos linux takes about 4 minutes
to be "online" from the time it starts.  i dont know what its doing but
wonder if there is a way to ping something in the tomcat to check status?