How to Migrate a Critical Host with Node 2, Node 3, or Node 4 Role on BDA 5.2 to a Non-Default Host (Doc ID 2966635.1)

Last updated on AUGUST 10, 2023

Applies to:

Goal

When performing a server resiliency action to migrate one of the critical BDA 5.2 hosts with Node 2, Node 3, Node 4 role it is possible to select the non-critical cluster host the critical roles will migrate to. See, How to Identify the Critical Hosts in a BDA Cluster (Doc ID 2624086.1), for steps on how to identify critical cluster hosts.

Server resilency actions to migrate a host are performed with "bdacli admin_cluster migrate <CRITICAL_HOST>". For details see, Node Migration on Oracle Big Data Appliance V4.0 OL6 Hadoop Cluster to Manage a Hardware Failure (Doc ID 1946210.1).

By default, if the host with Mammoth role needs to be migrated, the steps require selecting the non-critical cluster host to migrate the Mammoth role to.  Migrating the other critical hosts i.e. the hosts with Node 2, Node 3, Node 4 roles has a different default behavior.  For these hosts, the roles are migrated to the first non-critical node in the cluster. The first non-critical node in the cluster is Node 5 by default. If necessary, it is possible to migrate a host with Node 2, Node 3, Node 4 role to a different i.e. non-default, non-critical host. The steps for this follow.
 

Solution

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