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Subject: Re: ephemeral node not removed after the client session is long gone
From: kishore g <g.kishore@gmail.com>
To: user@zookeeper.apache.org
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Any idea on why this is happened. I tried reproducing this by doing the
following repeatedly
* create a session
* create ephemeral node
* close the session

Could not reproduce the issue.

We can provide additional details if needed

thanks,
Kishore G

On Sun, Sep 25, 2011 at 10:06 PM, kishore g <g.kishore@gmail.com> wrote:

> Hi,
>
> I got the following information from the logs.
>
> The node that still exists is
> /kafka-tracking/consumers/UserPerformanceEvent-<host>/owners/UserPerformanceEvent/529-7
>
> I saw that the ephemeral owner is 86167322861045079 which is session id
> 0x13220b93e610550.
>
> After searching in the transaction log of one of the ZK servers found that
> session expired
>
> 9/22/11 12:17:57 PM PDT session 0x13220b93e610550 cxid 0x74 zxid
> 0x601bd36f7 closeSession null
>
> On digging further into the logs I found that there were multiple sessions
> created in quick succession and every session tried to create the same node.
> But i verified that the sessions were closed and opened in order
> 9/22/11 12:17:56 PM PDT session 0x13220b93e610550 cxid 0x0 zxid 0x601bd36b5
> createSession 6000
> 9/22/11 12:17:57 PM PDT session 0x13220b93e610550 cxid 0x74 zxid
> 0x601bd36f7 closeSession null
> 9/22/11 12:17:58 PM PDT session 0x13220b93e610551 cxid 0x0 zxid 0x601bd36f8
> createSession 6000
> 9/22/11 12:17:59 PM PDT session 0x13220b93e610551 cxid 0x74 zxid
> 0x601bd373a closeSession null
> 9/22/11 12:18:00 PM PDT session 0x13220b93e610552 cxid 0x0 zxid 0x601bd373e
> createSession 6000
> 9/22/11 12:18:01 PM PDT session 0x13220b93e610552 cxid 0x6c zxid
> 0x601bd37a0 closeSession null
> 9/22/11 12:18:02 PM PDT session 0x13220b93e610553 cxid 0x0 zxid 0x601bd37e9
> createSession 6000
> 9/22/11 12:18:03 PM PDT session 0x13220b93e610553 cxid 0x74 zxid
> 0x601bd382b closeSession null
> 9/22/11 12:18:04 PM PDT session 0x13220b93e610554 cxid 0x0 zxid 0x601bd383c
> createSession 6000
> 9/22/11 12:18:05 PM PDT session 0x13220b93e610554 cxid 0x6a zxid
> 0x601bd388f closeSession null
> 9/22/11 12:18:06 PM PDT session 0x13220b93e610555 cxid 0x0 zxid 0x601bd3895
> createSession 6000
> 9/22/11 12:18:07 PM PDT session 0x13220b93e610555 cxid 0x6a zxid
> 0x601bd38cd closeSession null
> 9/22/11 12:18:10 PM PDT session 0x13220b93e610556 cxid 0x0 zxid 0x601bd38d1
> createSession 6000
> 9/22/11 12:18:11 PM PDT session 0x13220b93e610557 cxid 0x0 zxid 0x601bd38f2
> createSession 6000
> 9/22/11 12:18:11 PM PDT session 0x13220b93e610557 cxid 0x51 zxid
> 0x601bd396a closeSession null
>
> Here is the log output for the sessions that tried creating the same node
>
> 9/22/11 12:17:54 PM PDT session 0x13220b93e61054f cxid 0x42 zxid
> 0x601bd366b create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:17:56 PM PDT session 0x13220b93e610550 cxid 0x42 zxid
> 0x601bd36ce create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:17:58 PM PDT session 0x13220b93e610551 cxid 0x42 zxid
> 0x601bd3711 create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:18:00 PM PDT session 0x13220b93e610552 cxid 0x42 zxid
> 0x601bd3777 create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:18:02 PM PDT session 0x13220b93e610553 cxid 0x42 zxid
> 0x601bd3802 create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:18:05 PM PDT session 0x13220b93e610554 cxid 0x44 zxid
> 0x601bd385d create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:18:07 PM PDT session 0x13220b93e610555 cxid 0x44 zxid
> 0x601bd38b0 create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:18:11 PM PDT session 0x13220b93e610557 cxid 0x52 zxid
> 0x601bd396b create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
>
> Let me know if you need additional information.
>
> Thanks,
> Kishore G
>
>
> On Sun, Sep 25, 2011 at 12:56 PM, Camille Fournier <camille@apache.org>wrote:
>
>> Can you give us more details, like the information on the client that
>> created it, any logs around the time they created it/disconnected,
>> etc?
>>
>> On Sun, Sep 25, 2011 at 2:54 PM, Jun Rao <junrao@gmail.com> wrote:
>> > Hi,
>> >
>> > We found our ZK server in a state where an ephemeral node still exists
>> after
>> > a client session is long gone. I used the cons command on each ZK host
>> to
>> > list all connections and couldn't find the ephemeralOwner id. We are
>> using
>> > ZK 3.3.3. Has anyone seen this problem?
>> >
>> > Thanks,
>> >
>> > Jun
>> >
>>
>
>

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