Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Threaded View
Zookeeper >> mail # user >> Determine if the distributed mode of ZK functions correctly


Copy link to this message
-
Re: Determine if the distributed mode of ZK functions correctly
>> Where can I find this "srsr" command?

It is actually the 4 letter command - "srvr". You can run it like any other
4 letter zk command -

echo srvr | nc zk-server zk-port

Thanks,
Neha

On Tue, Dec 6, 2011 at 1:26 PM, Florian Leibert <[EMAIL PROTECTED]> wrote:

> Where can I find this "srsr" command? It's not part of the zkCli syntax nor
> can I find a reference to it...
>
> Thanks,
> Florian
>
> On Tue, Dec 6, 2011 at 11:51 AM, Neha Narkhede <[EMAIL PROTECTED]
> >wrote:
>
> > >> I was wondering if there was an easy way to check if a given zookeeper
> > server has joined an ensemble successfully and how many nodes of the
> > ensemble are alive.
> >
> > Today, we do this by relying on the Mode reported by the srvr command. If
> > the value is anything other than leader/follower, it is not participating
> > in the quorum.
> > We simply count the total of leader/follower nodes and ensure that they
> are
> > higher than a threshold.
> >
> > The downside of this approach is having to run srvr periodically.
> >
> > Thanks,
> > Neha
> >
> > On Tue, Dec 6, 2011 at 11:44 AM, Florian Leibert <[EMAIL PROTECTED]> wrote:
> >
> > > Thanks - though I'll have to have knowledge of the other servers and
> have
> > > to maintain yet another copy of the server-addresses - I wanted to use
> it
> > > within monit to determine if the server is functioning correctly -
> while
> > I
> > > of course have to always change the zoo.cnf in case of topology
> changes,
> > I
> > > now also have to update my monit scripts to add/remove any servers to
> use
> > > with the smoketest.
> > >
> > > Too bad ZK doesn't expose via the API a get_ensemble_size ~ that would
> > > allow me to alert in case the ensemble is less than X...
> > >
> > > But this helps!
> > >
> > > Thanks!
> > >
> > > On Tue, Dec 6, 2011 at 11:39 AM, Patrick Hunt <[EMAIL PROTECTED]>
> wrote:
> > >
> > > > I created the zk-smoketest project explicitly to help ops with this
> > > > problem:
> > > > https://github.com/phunt/zk-smoketest
> > > >
> > > > Patrick
> > > >
> > > > On Tue, Dec 6, 2011 at 9:39 AM, Florian Leibert <[EMAIL PROTECTED]>
> > wrote:
> > > > > Hi -
> > > > > I was wondering if there was an easy way to check if a given
> > zookeeper
> > > > > server has joined an ensemble successfully and how many nodes of
> the
> > > > > ensemble are alive. Of course I could create a test-node on one of
> > the
> > > > > servers and check the existence on the other ones but wanted to
> check
> > > > first
> > > > > if there was another way.
> > > > >
> > > > > I looked at the client bindings in the python project as well as
> the
> > > ones
> > > > > in the ruby project but didn't see that there really was one. I
> > > > > specifically want to ensure that the servers are communicating with
> > > each
> > > > > other and not form "separate" ensembles.
> > > > >
> > > > > Thanks,
> > > > > Florian
> > > >
> > >
> > >
> > >
> > > --
> > > Best regards,
> > >
> > > Florian
> > > http://twitter.com/flo <http://twitter.com/floleibert>
> > > http://flori.posterous.com/
> > >
> >
>
>
>
> --
> Best regards,
>
> Florian
> http://twitter.com/flo <http://twitter.com/floleibert>
> http://flori.posterous.com/
>
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB