【原创】大叔经验分享（62）kudu副本数量

kudu的副本数量是在表上设置，可以通过命令查看

# sudo -u kudu kudu cluster ksck $master
...
Summary by table
            Name            | RF | Status  | Total Tablets | Healthy | Recovering | Under-replicated | Unavailable
----------------------------------------------------------+----+---------+---------------+---------+------------+------------------+-------------
 impala::test_db.test_table | 3  | HEALTHY | 4             | 4       | 0          | 0                | 0
...

其中RF即replication factor；

副本数量只能在创建表时指定，创建后不能修改，并且副本数量必须为奇数

By default, Kudu tables created through Impala use a tablet replication factor of 3. To specify the replication factor for a Kudu table, add a TBLPROPERTIES clause to the CREATE TABLE statement as shown below where n is the replication factor you want to use:

TBLPROPERTIES ('kudu.num_tablet_replicas' = 'n')

A replication factor must be an odd number.

Changing the kudu.num_tablet_replicas table property using ALTER TABLE currently has no effect.

参考：
https://kudu.apache.org/docs/kudu_impala_integration.html