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Re: question about ZKFC daemon
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On Dec 27, 2012 8:04 PM, "ESGLinux" <[EMAIL PROTECTED]> wrote:

> Hi all,
>
> I have a doubt about how to deploy the Zookeeper in a NN HA  cluster,
>
> As far as I know, I need at least three nodes to run three ZooKeeper
> FailOver Controller (ZKFC). I plan to put these 3 daemons this way:
>
> - Active NameNode + 1 ZKFC daemon
> - Standby NameNode + 1 ZKFC daemon
> - JobTracker node + 1 ZKFC daemon, (is this right?)
>
> so the quorum is formed with these three nodes. The nodes that runs a
> namenode are right because the ZKFC monitors it, but what does the third
> daemon?
>
> as I read from this url:
>
> https://ccp.cloudera.com/display/CDH4DOC/Software+Configuration+for+Quorum-based+Storage#SoftwareConfigurationforQuorum-basedStorage-AutomaticFailoverConfiguration
>
> this daemons are only related with NameNodes, (*Health monitoring* - the
> ZKFC pings its local NameNode on a periodic basis with a health-check
> command.) so what does the third ZKFC? I used the jobtracker node but I
> could use another node without any daemon on it...
>
> Thanks in advance,
>
> ESGLInux,
>
>
>
>