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From Raúl Gutiérrez Segalés <...@itevenworks.net>
Subject Re: Zookeeper C client fail to deliver a session event
Date Fri, 25 Apr 2014 18:18:55 GMT
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.


-rgs

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