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Zookeeper, mail # user - Starting a distributed env of ZK


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Sznajder ForMailingList 2013-09-12, 10:31
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Rakesh R 2013-09-12, 11:40
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Re: Starting a distributed env of ZK
Sznajder ForMailingList 2013-09-12, 11:56
Hi

Thank you for your answer.
Indeed, I would like to use a quorum of instances.

In this case:

1 - should I start ZK on each one of the servers?

2 - Starting ZK is done via zkServer.sh or via the command line
java -cp zookeeper.jar:lib/slf4j-api-1.
6.1.jar:lib/
slf4j-log4j12-1.6.1.jar:lib/log4j-1.2.15.jar:conf \
org.apache.zookeeper.server.quorum.QuorumPeerMain zoo.cfg
Thanks again!

On Thu, Sep 12, 2013 at 2:40 PM, Rakesh R <[EMAIL PROTECTED]> wrote:

> Hi Sznajder,
>
> >> 1 - In case of  distributed env of ZK, should I start ZK on each one of
> the servers? Or only in the master?
>
> It all depends on the tolerated failures in the system and if ZK server
> goes down, what would be the impact on your application. In case of Single
> node ZooKeeper server, it will be the Single Point of Contact.
>
> The advantage of having ZooKeeper quorum of instances is, your system will
> be able to run even if few ZooKeeper server fails.
>
> Please see more about ZooKeeper quorum at:
>
>
> http://zookeeper.apache.org/doc/trunk/zookeeperStarted.html#sc_RunningReplicatedZooKeeper
>
>
>
> >>>>>2 - Is it OK to start the server via "bin/zkServer.sh start " or
> should I use the long command line:
> java -cp zookeeper.jar:lib/slf4j-api-1.6.1.jar:lib/
> slf4j-log4j12-1.6.1.jar:lib/log4j-1.2.15.jar:conf \
> org.apache.zookeeper.server.quorum.QuorumPeerMain zoo.cfg
>
> I'll suggest to use the script bin/zkServer.sh start and this is pretty
> simple.
>
> Please see this section, it will be helpful to setup single node.
>
>
> http://zookeeper.apache.org/doc/trunk/zookeeperStarted.html#sc_InstallingSingleMode
>
> -Rakesh
>
> -----Original Message-----
> From: Sznajder ForMailingList [mailto:[EMAIL PROTECTED]]
> Sent: 12 September 2013 16:01
> To: [EMAIL PROTECTED]
> Subject: Starting a distributed env of ZK
>
> Hi
>
> Two questions:
>
> 1 - In case of  distributed env of ZK, should I start ZK on each one of
> the servers? Or only in the master?
>
> 2 - Is it OK to start the server via "bin/zkServer.sh start " or should I
> use the long command line:
> java -cp zookeeper.jar:lib/slf4j-api-1.6.1.jar:lib/
> slf4j-log4j12-1.6.1.jar:lib/log4j-1.2.15.jar:conf \
> org.apache.zookeeper.server.quorum.QuorumPeerMain zoo.cfg
>
>
>
> Thanks!
>
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Chris Brinley 2013-09-12, 12:56
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Sznajder ForMailingList 2013-09-12, 13:06