In Production Level HA Cluster Do we need dedicated servers for JournalNodes and zookepers ?

[#1]

In Production Level HA Cluster Do we need dedicated servers for JournalNodes and zookepers ? what are the recommendation ?

[#2]

not really required . we can installed ZK on any master nodes and JN on any data nodes.

[#3 · Accepted solution]

@Duminda Jayasuriya

My understanding is it is always a good idea to have separate server for JournalNodes and zookeepers in production environment with HA. Also for cost-effectiveness JournalNodes and zookeepers can be co-hosted. Co-hosing comes with the prize of downtime of all services which are co-hosted.

Both zookeeper and JournalNodes are quorum based system. Co-hosting them with master nodes will give only 2 nodes, rest of the nodes should be hosted on separate machines.

[#4]

Zk should have access to dedicated disk but aside from that you can colocated them with master services. The minimum quorum requirement is 3 nodes. @Duminda Jayasuriya

[#5]

In addition to putting them on Master Nodes co-located to other resources, the Zookeeper and Journal should be on JBODs... see diagram

[#6]

Thanks understood.