Re: [EsiGate-devel] Thread locked under load

[François-Xavier B. <fra...@ce...>]

OK, so we should wrap the TreeSet and HashMap used in Output class using 
Collections.synchronizedSortedSet(...) and Collections.synchronizedMap(...)
Nicolas, can you check that it fixes the problem ?

Le 21/03/2012 15:10, Alexis Thaveau a écrit :
> http://java.dzone.com/articles/concurrency-and-hashmap
>
> Le 21/03/2012 15:08, Alexis Thaveau a écrit :
>> The main bug is that headers.put is called by several threads at same 
>> time. As you said, thread are still runnable,  i think map is broken, 
>> and result is a kind of infinite loop.
>>
>>
>>
>>
>>
>> Le 21/03/2012 14:53, François-Xavier Bonnet a écrit :
>>> This is a real problem but do you think it can explain the 100% CPU ?
>>> Shouldn't we have some ConcurrentModificationException ?
>>> Cordialement,
>>>
>>> François-Xavier Bonnet
>>> Responsable de production
>>> Smile - Open Source Solutions
>>> www.smile.fr
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>>> Le 21/03/2012 11:52, Alexis Thaveau a écrit :
>>>> Hi,
>>>>
>>>> Implementation of TreeSet is not synchronized => not thread safe. 
>>>> http://docs.oracle.com/javase/6/docs/api/java/util/TreeSet.html
>>>> TreeSet must be wrapped with Collections.synchronizedSortedSet || 
>>>> <http://docs.oracle.com/javase/6/docs/api/java/util/Collections.html#synchronizedSortedSet%28java.util.SortedSet%29>
>>>>
>>>>
>>>> Le 21/03/2012 11:44, Nicolas Richeton a écrit :
>>>>> Hi all
>>>>>
>>>>> We have an issue with with ESIGate 2.19 under load, resulting to 100% cpu usage and lock.
>>>>>
>>>>> Please have a look to :
>>>>> http://sourceforge.net/apps/mantisbt/webassembletool/view.php?id=84
>>>>>
>>>>> We have the setup show the issue, but not easy to test. Problem arises after several hours.
>>>>>
>>>>> This seems to be linked to the new cache system because older versions of ESIGate did not show any locking under heavy load.
>>>>>
>>>>> Andreii : any idea/comments on this issue ?
>>>>>
>>>>> Nicolas
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>>>>
>>>> -- 
>>>> Alexis Thaveau
>>>> Agence Nantes
>>>> Smile - Open Source Solutions
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>> -- 
>> Alexis Thaveau
>> Agence Nantes
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>
> -- 
> Alexis Thaveau
> Agence Nantes
> Smile - Open Source Solutions
> http://www.smile.fr
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>
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