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From Chang Song <tru64...@me.com>
Subject Re: Serious problem processing hearbeat on login stampede
Date Sat, 02 Jul 2011 05:22:43 GMT

No problem.
Glad to contribute.

Thanks a lot.


2011. 7. 2., 오전 1:03, Ted Dunning 작성:

> Thanks for the feedback Jared!
> 
> (and thanks to Chang as well!)
> 
> On Fri, Jul 1, 2011 at 8:06 AM, Jared Cantwell <jared.cantwell@gmail.com>wrote:
> 
>> As a note, I believe we just used this patch to solve a major issue ...
>> 
>> Thanks Chang!
>> ~Jared
>> 
>> On Tue, Apr 19, 2011 at 10:59 AM, Ted Dunning <ted.dunning@gmail.com>
>> wrote:
>> 
>>> Where is this set?
>>> 
>>> Why does this cause this problem?
>>> 
>>> 2011/4/19 Chang Song <tru64ufs@me.com>
>>> 
>>>> 
>>>> Problem solved.
>>>> it was socket linger option set to 2 sec timeout.
>>>> 
>>>> We have verified that the original problem goes away when we turn off
>>>> linger option.
>>>> No longer a mystery ;)
>>>> 
>>>> 
>>>> https://issues.apache.org/jira/browse/ZOOKEEPER-1049
>>>> 
>>>> 
>>>> Chang
>>>> 
>>>> 
>>>> 2011. 4. 19., 오전 3:16, Mahadev Konar 작성:
>>>> 
>>>>> Camille, Ted,
>>>>> Can we continue the discussion on
>>>>> https://issues.apache.org/jira/browse/ZOOKEEPER-1049?
>>>>> 
>>>>> We should track all the suggestions/issues on the jira.
>>>>> 
>>>>> thanks
>>>>> mahadev
>>>>> 
>>>>> On Mon, Apr 18, 2011 at 9:03 AM, Ted Dunning <ted.dunning@gmail.com>
>>>> wrote:
>>>>>> Interesting.  It does seem to suggestion the session expiration is
>>>>>> expensive.
>>>>>> 
>>>>>> There is a concurrent table in guava that provides very good
>>>> multi-threaded
>>>>>> performance.  I think that is achieved by using a number of locks
>> and
>>>> then
>>>>>> distributing threads across the locks according to the hash slot
>> being
>>>> used.
>>>>>> But I would have expected any in memory operation to complete very
>>>> quickly.
>>>>>> 
>>>>>> Is it possible that the locks on the session table are held longer
>>> than
>>>> they
>>>>>> should be?
>>>>>> 
>>>>>> 2011/4/18 Fournier, Camille F. [Tech] <Camille.Fournier@gs.com>
>>>>>> 
>>>>>>> Is it possible this is related to this report back in February?
>>>>>>> 
>>>>>>> 
>>>> 
>>> 
>> http://mail-archives.apache.org/mod_mbox/zookeeper-user/201102.mbox/%3C6642FC1CAF133548AA8FDF497C547F0A23C0C5265B@NYWEXMBX2126.msad.ms.com%3E
>>>>>>> 
>>>>>>> I theorized that the issue might be due to synchronization on
the
>>>> session
>>>>>>> table, but never got enough information to finish the
>> investigation.
>>>>>>> 
>>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> --
>>>>> thanks
>>>>> mahadev
>>>>> @mahadevkonar
>>>> 
>>>> 
>>> 
>> 


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