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From Mark Thomas <ma...@apache.org>
Subject Re: what exactly happens when timeouts are set and tomcat has outofmemory errors.
Date Tue, 04 Aug 2009 09:05:35 GMT
Madhuri Patwardhan wrote:

> Do you know anything about recovery options?

No. You could try reading the docs and/or the source code.

Mark
> 
> Thanks,
> Madhuri
> 
> --- On Mon, 8/3/09, Mark Thomas <markt@apache.org> wrote:
> 
>> From: Mark Thomas <markt@apache.org>
>> Subject: Re: what exactly happens when timeouts are set and tomcat has outofmemory
errors.
>> To: "Tomcat Users List" <users@tomcat.apache.org>
>> Date: Monday, August 3, 2009, 6:49 PM
>> Madhuri Patwardhan wrote:
>>> Hi,
>>>
>>> Can somebody go over the details of what exactly
>> happens when tomcat instance has outOfmemory errors and
>> there are following timeouts set in a loadbalancer worker
>> config. 
>>> This is my understanding.
>>>
>>> ping_mode=A, ping_timeout=10000, reply_timeout=60000
>> and recorver_options=3
>>> If the timeouts are set as above then CPing/Cpong test
>> for connect and prepost will work. When a new real request
>> is sent to this tomcat instance, it should hit reply_timeout
>> because it has outofmemory errors.
>>
>> That depends on the state of the JVM. It might appear to
>> work normally,
>> it might fail to respond at all. Once on OOM has occurred
>> Tomcat has to
>> be assumed to be in an unknown state and should be
>> restarted. I have
>> seen Tomcat instances apparently recover from an OOM. It
>> all depends why
>> the OOM occurred and what Tomcat was doing at the time.
>>
>>> Then depending on no. of retries set (it is default,
>> for me so 2), this instance will be tried once again. Second
>> time also it should not get reply within reply_timeout and
>> at that point it should be marked in "ERR" state. 
>>> However, I don't see that. I don't see it being marked
>> in "ERR" state. The state is still "OK" inspite of this
>> tomcat instance having outofmemory errors. Could somebody
>> explain what am I missing?
>>
>> In short, you are incorrectly assuming that once an OOM has
>> occurred
>> Tomcat will no longer respond to requests.
>>
>> Mark
>>
>>
>>
>>
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> 
> 
>       
> 
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