Unsubscribe 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, > > > >
