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,
