Apply Final Configuration Updates

Update Tablet Server Configuration

You can update all tablet servers with the new master addresses configuration.

Update tserver_master_addrs: Ambari automatically updates the tserver_master_addrs parameter when configuring tablet servers.
Restart the Services: Restart all services in Ambari to apply the new configuration on tablet servers. Use Ambari’s Rolling Restart feature to minimize downtime.
- In Ambari, navigate to the Kudu service.
- Select Rolling Restart to restart tablet servers in batches.
- Configure batch sizes and wait times between restarts.

Update Impala Integration (if applicable)

If Kudu tables are accessed through Impala, update the master addresses in the Hive Metastore (HMS).

Option 1: Update the HMS Database Directly

Run an SQL update in the underlying HMS database (for example, PostgreSQL) after migrating from one to three masters:

UPDATE TABLE_PARAMS
SET PARAM_VALUE =
'master-1.example.com,master-2.example.com,master-3.example.com'
WHERE PARAM_KEY = 'kudu.master_addresses' AND PARAM_VALUE = 'master-1.example.com';

Option 2: Update Each Kudu Table in Impala

Run the following command for each Kudu table in impala-shell:

ALTER TABLE <table_name>
SET TBLPROPERTIES
('kudu.master_addresses' = 'master-1.example.com,master-2.example.com,master-3.example.com');

Refresh the Metadata

After updating the properties, run the following command in impala-shell:

INVALIDATE METADATA;