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From Yan Xu <...@jxu.me>
Subject Re: Zookeeper C client fail to deliver a session event
Date Mon, 28 Apr 2014 19:06:53 GMT
Does your code catch the auth packets in-flight? Yeah I tried to repro it with similar code
(also with close()) but with no luck. :(

From: Raúl Gutiérrez Segalés rgs@itevenworks.net
Reply: user@zookeeper.apache.org user@zookeeper.apache.org
Date: April 26, 2014 at 9:58:05 AM
To: user@zookeeper.apache.org user@zookeeper.apache.org
Cc: zookeeper-user@hadoop.apache.org zookeeper-user@hadoop.apache.org
Subject:  Re: Zookeeper C client fail to deliver a session event  

On 25 April 2014 11:20, Raúl Gutiérrez Segalés <rgs@itevenworks.net> wrote:  

> On 25 April 2014 11:18, Raúl Gutiérrez Segalés <rgs@itevenworks.net>wrote: 

>  
>> On 25 April 2014 10:15, Yan Xu <yan@jxu.me> wrote:  
>>  
>>> Hi zookeeper-user,  
>>>  
>>> When I was triaging an issue with my ZK wrapper I think I found that  
>>> during  
>>> disconnection ZK client has failed to deliver the session event to the  
>>> watcher (but logged it).  
>>>  
>>> The log shows:  
>>>  
>>> 2014-04-23 23:50:30,324:990(0x7f75d4ba9940):ZOO_INFO@check_events@1703:  
>>> initiated connection to server [<...>:2181]  
>>> 2014-04-23 23:50:31,603:990(0x7f75d4ba9940):ZOO_INFO@check_events@1750:  
>>> session establishment complete on server [<...>:2181],  
>>> sessionId=0x2456db1b7d32534, negotiated timeout=10000  
>>> ...  
>>> 2014-04-23  
>>> 23:50:38,925:990(0x7f75d4ba9940):ZOO_ERROR@handle_socket_error_msg@1643:  
>>> Socket [<...>:2181] zk retcode=-7, errno=110(Connection timed out):  
>>> connection to <...>:2181 timed out (exceeded timeout by 636ms)  
>>> 2014-04-23 23:50:38,925:990(0x7f75d4ba9940):ZOO_WARN@zookeeper_interest  
>>> @1557:  
>>> Exceeded deadline by 1842ms  
>>> 2014-04-23 23:50:38,925:990(0x7f75d4ba9940):ZOO_INFO@check_events@1703:  
>>> initiated connection to server [<...>:2181]  
>>> 2014-04-23 23:50:38,927:990(0x7f75d4ba9940):ZOO_INFO@check_events@1750:  
>>> session establishment complete on server [<...>:2181],  
>>> sessionId=0x2456db1b7d32534, negotiated timeout=10000  
>>>  
>>  
>>> which indicates that ZK client state transitioned from CONNECTED ->  
>>> CONNECTING -> CONNECTED.  
>>>  
>>> But my wrapper code was expecting a watcher event with ZOO_SESSION_EVENT  
>>> &  
>>> ZOO_CONNECTING_STATE but never got one.  
>>> The events for the CONNECTED state before and after the disconnection  
>>> were  
>>> delivered.  
>>>  
>>>  
>> Was auth performed in the missing parts of the log? If so I guess you  
>> could take the first branch here:  
>>  
>>  
>> https://github.com/apache/zookeeper/blob/branch-3.4/src/c/src/zookeeper.c#L1224 

>>  
>> thus not missing the PROCESS_SESSION_EVENT(zh, ZOO_CONNECTING_STATE)  
>> call.  
>>  
>  
> Meant "thus missing". Lack of coffee :-)  
>  
> I wonder if this could happen when you have an AUTH packet in-flight.  
>  

Failing to get a repro with https://gist.github.com/rgs1/11325061 so far.  


-rgs  

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