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From Patrick Hunt <ph...@apache.org>
Subject Re: Zookeeper multiserver setup?
Date Thu, 17 May 2012 21:27:09 GMT
On Thu, May 10, 2012 at 8:16 AM, Adam Rosien <adam@rosien.net> wrote:
> Should I file a JIRA?

Yes.

Patrick

> On Wed, May 9, 2012 at 3:24 PM, Patrick Hunt <phunt@apache.org> wrote:
>
>> On Wed, May 9, 2012 at 8:33 AM, Adam Rosien <adam@rosien.net> wrote:
>> > I have often gotten confused by the "Node Count" field from stat,
>> thinking
>> > it meant cluster nodes, not znodes. I have to remind myself every time I
>> > see it. Folks amenable to changing the name?
>>
>> The names are overloaded which is unfortunate, node vs znode vs server
>> node vs server instance.... Unfortunately it would be hard to change
>> at this point given many third party tools depend on the name. Perhaps
>> 4.0?
>>
>> Patrick
>>
>> > On Tue, May 8, 2012 at 2:54 PM, Something Something <
>> > mailinglists19@gmail.com> wrote:
>> >
>> >> Hmm...
>> >>
>> >>
>> >> Trying 127.0.0.1...
>> >> Connected to localhost.
>> >> Escape character is '^]'.
>> >> stat
>> >> Zookeeper version: 3.3.4-cdh3u3--1, built on 01/26/2012 20:09 GMT
>> >> Clients:
>> >>  /127.0.0.1:42510[0](queued=0,recved=1,sent=0)
>> >>
>> >> Latency min/avg/max: 0/0/0
>> >> Received: 4
>> >> Sent: 3
>> >> Outstanding: 0
>> >> Zxid: 0x100000000
>> >> Mode: follower
>> >> Node count: 11
>> >> Connection closed by foreign host.
>> >>
>> >>
>> >> Not sure I understand this output.  I have 9 nodes in the ensemble.
>> >>
>> >> On Tue, May 8, 2012 at 2:45 PM, Jordan Zimmerman <
>> jzimmerman@netflix.com
>> >> >wrote:
>> >>
>> >> > Yes - they should. Keep in mind that the zoo.cfg, and the ID file
>> must be
>> >> > correct and in agreement on each instance. You can do a stat on each
>> >> > instance to see what state it's in:
>> >> >
>> >> >    >telnet localhost 2181
>> >> >     stat
>> >> >
>> >> > -JZ
>> >> >
>> >> > On 5/8/12 2:43 PM, "Something Something" <mailinglists19@gmail.com>
>> >> wrote:
>> >> >
>> >> > >Thanks Jordan.  Will definitely look at the cluster management
tool.
>>  In
>> >> > >the mean time, am I correct with my assumption in #4?  Once all
of
>> them
>> >> > >are
>> >> > >started they would automagically start talking to each other, right?
>> >> > >
>> >> > >
>> >> > >On Tue, May 8, 2012 at 2:36 PM, Jordan Zimmerman
>> >> > ><jzimmerman@netflix.com>wrote:
>> >> > >
>> >> > >> Yes, you must start them all individually. ZooKeeper does
not
>> >> currently
>> >> > >> have any cluster-wide management tools built in.
>> >> > >>
>> >> > >> FYI - we've open sourced a cluster management tool for ZooKeeper.
>> >> Please
>> >> > >> have a look:
>> >> > >>
>> >> > >>        https://github.com/Netflix/exhibitor
>> >> > >>
>> >> > >> On 5/8/12 2:31 PM, "Something Something" <mailinglists19@gmail.com
>> >
>> >> > >>wrote:
>> >> > >>
>> >> > >> >Hello,
>> >> > >> >
>> >> > >> >Trying to follow directions from here:
>> >> > >> >
>> >> > >>
>> >> > >>
>> >> >
>> >>
>> http://zookeeper.apache.org/doc/trunk/zookeeperAdmin.html#sc_zkMulitServe
>> >> > >>r
>> >> > >> >Setup
>> >> > >> >
>> >> > >> >to setup a cluster of zookeepers.
>> >> > >> >
>> >> > >> >Questions:
>> >> > >> >
>> >> > >> >1)  If everything is setup correctly, do I have to go
to each
>> machine
>> >> > >>and
>> >> > >> >start Zookeeper server in each of them individually?
>> >> > >> >2)  I was thinking if I start it on one master machine
(well
>> there's
>> >> no
>> >> > >> >real master) then all zookeepers in the quorum would be
started,
>> but
>> >> > >>this
>> >> > >> >is not how it works correct?
>> >> > >> >3)  If I start individually, then I get messages saying
the other
>> >> > >> >zookeepers haven't started.  Is that just a warning?
>> >> > >> >4)  When all of them are started, would they all be able
to talk
>> to
>> >> > >>each
>> >> > >> >other?
>> >> > >> >
>> >> > >> >Sorry for the dumb questions and thanks for the help.
>> >> > >>
>> >> > >>
>> >> >
>> >> >
>> >>
>>

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