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Posted to user@zookeeper.apache.org by Jordan Zimmerman <jz...@netflix.com> on 2011/08/26 20:06:12 UTC
Strange responses from server
I have a three node ensemble. Each node responds to "ruok" with "imok".
Yet, each one response to "stat" with "This ZooKeeper instance is not
currently serving requests". What gives? Which one should I trust? How
might it get in this state and what's the correct way to fix it?
-Jordan
Re: Strange responses from server
Posted by Patrick Hunt <ph...@apache.org>.
That's how tools like my zktop currently work. https://github.com/phunt/zktop
Andrei did some work in 3.4.0 (unreleased as of yet) to support more
(easier) machine readable output.
Patrick
On Fri, Aug 26, 2011 at 11:46 AM, Jordan Zimmerman
<jz...@netflix.com> wrote:
> What's missing, IMO, is a uniform response that says the system is
> nominal. I can query "stat" but I now have to do an ugly compare against
> the response - something like: response.startsWith("Zookeeper version").
> Or, am I missing something?
>
> -JZ
>
> On 8/26/11 11:42 AM, "Ted Dunning" <te...@gmail.com> wrote:
>
>>Not really.
>>
>>Diagnosing the network is an important step. Diagnosing quorum formation
>>is
>>the next step.
>>
>>On Fri, Aug 26, 2011 at 11:31 AM, Jordan Zimmerman
>><jz...@netflix.com>wrote:
>>
>>> Thanks - that makes "ruok" essentially useless. Grrr...
>>>
>>> On 8/26/11 11:10 AM, "Patrick Hunt" <ph...@apache.org> wrote:
>>>
>>> >ruok checks if the server is listening on the port, that it's up and
>>> >functional, not that it's joined a quorum
>>> >
>>> >stat provides details on the server wrt the quorum, not serving
>>> >requests means that it is not currently a member of the quorum.
>>> >
>>> >You'd need to check the logs to see why it's not participating.
>>> >
>>> >Patrick
>>> >
>>> >On Fri, Aug 26, 2011 at 11:06 AM, Jordan Zimmerman
>>> ><jz...@netflix.com> wrote:
>>> >> I have a three node ensemble. Each node responds to "ruok" with
>>>"imok".
>>> >> Yet, each one response to "stat" with "This ZooKeeper instance is not
>>> >> currently serving requests". What gives? Which one should I trust?
>>>How
>>> >> might it get in this state and what's the correct way to fix it?
>>> >>
>>> >> -Jordan
>>> >>
>>> >>
>>> >
>>>
>>>
>
>
Re: Strange responses from server
Posted by Jordan Zimmerman <jz...@netflix.com>.
What's missing, IMO, is a uniform response that says the system is
nominal. I can query "stat" but I now have to do an ugly compare against
the response - something like: response.startsWith("Zookeeper version").
Or, am I missing something?
-JZ
On 8/26/11 11:42 AM, "Ted Dunning" <te...@gmail.com> wrote:
>Not really.
>
>Diagnosing the network is an important step. Diagnosing quorum formation
>is
>the next step.
>
>On Fri, Aug 26, 2011 at 11:31 AM, Jordan Zimmerman
><jz...@netflix.com>wrote:
>
>> Thanks - that makes "ruok" essentially useless. Grrr...
>>
>> On 8/26/11 11:10 AM, "Patrick Hunt" <ph...@apache.org> wrote:
>>
>> >ruok checks if the server is listening on the port, that it's up and
>> >functional, not that it's joined a quorum
>> >
>> >stat provides details on the server wrt the quorum, not serving
>> >requests means that it is not currently a member of the quorum.
>> >
>> >You'd need to check the logs to see why it's not participating.
>> >
>> >Patrick
>> >
>> >On Fri, Aug 26, 2011 at 11:06 AM, Jordan Zimmerman
>> ><jz...@netflix.com> wrote:
>> >> I have a three node ensemble. Each node responds to "ruok" with
>>"imok".
>> >> Yet, each one response to "stat" with "This ZooKeeper instance is not
>> >> currently serving requests". What gives? Which one should I trust?
>>How
>> >> might it get in this state and what's the correct way to fix it?
>> >>
>> >> -Jordan
>> >>
>> >>
>> >
>>
>>
Re: Strange responses from server
Posted by Ted Dunning <te...@gmail.com>.
Not really.
Diagnosing the network is an important step. Diagnosing quorum formation is
the next step.
On Fri, Aug 26, 2011 at 11:31 AM, Jordan Zimmerman
<jz...@netflix.com>wrote:
> Thanks - that makes "ruok" essentially useless. Grrr...
>
> On 8/26/11 11:10 AM, "Patrick Hunt" <ph...@apache.org> wrote:
>
> >ruok checks if the server is listening on the port, that it's up and
> >functional, not that it's joined a quorum
> >
> >stat provides details on the server wrt the quorum, not serving
> >requests means that it is not currently a member of the quorum.
> >
> >You'd need to check the logs to see why it's not participating.
> >
> >Patrick
> >
> >On Fri, Aug 26, 2011 at 11:06 AM, Jordan Zimmerman
> ><jz...@netflix.com> wrote:
> >> I have a three node ensemble. Each node responds to "ruok" with "imok".
> >> Yet, each one response to "stat" with "This ZooKeeper instance is not
> >> currently serving requests". What gives? Which one should I trust? How
> >> might it get in this state and what's the correct way to fix it?
> >>
> >> -Jordan
> >>
> >>
> >
>
>
Re: Strange responses from server
Posted by Jordan Zimmerman <jz...@netflix.com>.
Thanks - that makes "ruok" essentially useless. Grrr...
On 8/26/11 11:10 AM, "Patrick Hunt" <ph...@apache.org> wrote:
>ruok checks if the server is listening on the port, that it's up and
>functional, not that it's joined a quorum
>
>stat provides details on the server wrt the quorum, not serving
>requests means that it is not currently a member of the quorum.
>
>You'd need to check the logs to see why it's not participating.
>
>Patrick
>
>On Fri, Aug 26, 2011 at 11:06 AM, Jordan Zimmerman
><jz...@netflix.com> wrote:
>> I have a three node ensemble. Each node responds to "ruok" with "imok".
>> Yet, each one response to "stat" with "This ZooKeeper instance is not
>> currently serving requests". What gives? Which one should I trust? How
>> might it get in this state and what's the correct way to fix it?
>>
>> -Jordan
>>
>>
>
Re: Strange responses from server
Posted by Patrick Hunt <ph...@apache.org>.
ruok checks if the server is listening on the port, that it's up and
functional, not that it's joined a quorum
stat provides details on the server wrt the quorum, not serving
requests means that it is not currently a member of the quorum.
You'd need to check the logs to see why it's not participating.
Patrick
On Fri, Aug 26, 2011 at 11:06 AM, Jordan Zimmerman
<jz...@netflix.com> wrote:
> I have a three node ensemble. Each node responds to "ruok" with "imok".
> Yet, each one response to "stat" with "This ZooKeeper instance is not
> currently serving requests". What gives? Which one should I trust? How
> might it get in this state and what's the correct way to fix it?
>
> -Jordan
>
>