Where Do Services Run On a Cluster?

Services are installed on all nodes of an Oracle Big Data Cloud Service cluster, but individual services run only on designated nodes. A cluster can have from 3 to 60 permanent nodes, and the services are distributed differently, depending on the number of nodes:

• Services on a three-node cluster are distributed as shown in Where Do the Services Run on a Three-Node, Development-Only Cluster?.

• Services on a cluster of four or more nodes are distributed as shown in Where Do the Services Run on a Cluster of Four or More Nodes?.

Consider the following:

• If you have a three-node cluster and then expand it to four or more nodes, the services are automatically redistributed, as shown in Where Do the Services Run on a Cluster of Four or More Nodes?.

• Three- and four-node clusters are recommended for development purposes only.

• The minimum recommended size for a production cluster is five nodes.

• If you plan to install Oracle Big Data Discovery on Oracle Big Data Cloud Service, a minimum of five nodes is required.

Where Do the Services Run on a Three-Node, Development-Only Cluster?

The following table shows how services are distributed on the nodes of Oracle Big Data Cloud Service three-node clusters.

Service	Node1	Node2	Node3
Active Navigator Key Trustee Server (if secure cluster is enabled)	Yes	No	No
Big Data Manager	No	No	Yes
Cloudera Manager and Cloudera Manager roles	No	No	Yes
DataNode	Yes	Yes	Yes
Failover Controller	Yes	Yes	No
Hive	No	Yes	No
Hive Metastore	No	Yes	No
HttpFS	No	Yes	No
Hue	No	Yes	No
JobHistory	No	No	Yes
JournalNode	Yes	Yes	Yes
Kerberos Master KDC (if secure cluster is enabled.)	Yes	No	No
Kerberos Slave KDC (if secure cluster is enabled)	No	Yes	No
MySQL Backup	No	Yes	No
MySQL Primary	No	No	Yes
NameNode	Yes	Yes	No
NodeManager	Yes	Yes	Yes
ODI	No	Yes	No
Oozie	No	Yes	No
Passive Navigator Key Trustee Server (if secure cluster is enabled)	No	Yes	No
ResourceManager	Yes	No	Yes
Sentry	Yes	No	No
Spark History	No	No	Yes
WebHCat	No	Yes	No
ZooKeeper	Yes	Yes	Yes

Where Do the Services Run on a Cluster of Four or More Nodes?

The following table shows how services are distributed on the nodes of Oracle Big Data Cloud Service clusters with four, five, or more nodes.

Note:

The minimum recommended size for a production cluster is five nodes.

Service	Node1	Node2	Node3	Node4	Node5 to Nodenn
Active Navigator Key Trustee Server (if secure cluster is enabled)	Yes	No	No	No	No
Balancer	Yes	No	No	No	No
Big Data Manager	No	No	Yes	No	No
Cloudera Manager Server	No	No	Yes	No	No
Cloudera Manager and Cloudera Manager roles	No	No	Yes	No	No
DataNode	Yes	Yes	Yes	Yes	Yes
Failover Controller	Yes	Yes	No	No	No
Hive	No	No	No	Yes	No
Hive Metastore	No	Yes	No	No	No
HttpFS	No	Yes	No	No	No
Hue	No	No	No	Yes	No
JobHistory	No	No	Yes	No	No
JournalNode	Yes	Yes	Yes	No	No
Kerberos KDC (if secure cluster is enabled.)	Yes	Yes	No	No	No
MySQL Backup	No	Yes	No	No	No
MySQL Primary	No	No	Yes	No	No
NameNode	Yes	Yes	No	No	No
Navigator Audit Server and Navigator Metadata Server	No	No	Yes	No	No
NodeManager	Yes	Yes	Yes	Yes	Yes
Oozie	No	No	No	Yes	No
Oracle Data Integrator Agent	No	No	No	Yes	No
Passive Navigator Key Trustee Server (if secure cluster is enabled)	No	Yes	No	No	No
ResourceManager	No	No	Yes	Yes	No
Sentry Server (if enabled)	Yes	No	No	No	No
Solr	No	No	No	Yes	No
Spark History	No	No	Yes	No	No
ZooKeeper	Yes	Yes	Yes	No	No

Note:

If Oracle Big Data Discovery is installed, the NodeManager and DataNode on Node05 of the cluster are decomissioned.