05-24-2016 12:46 AM
Hi everybody ,
I'm trying to "remove " the impala service from a single host .
I've clustered with 6 host and i have the impala service deployed on the whole cluster .
One of my host has really low on resources ( is the cloudera-manager host ) and and it is limiting impala queries on the cluster , so i've decided to exclude that host from impala cluster.
I'm trying to follow this steps on the offical administration guides :
but when i select the instance for the impala role i do not have the action " Decommission ".
there is a simple and secure way to exclude a impala instance from a role without decomissioning all services ?
thanks in advance,
05-24-2016 08:11 AM
The documenta suggests Role decommissioning applies to HDFS DataNode, MapReduce TaskTracker, YARN NodeManager, and HBase RegionServer roles. Are you not able to delete/stop the Impala role instance and add/start it when you have allocated more resources on the node?
05-24-2016 09:06 AM - edited 05-24-2016 09:10 AM
By deleting the impala role from a host, i need to reconfigure something ?
the cluster just ignores the deleted host when the query is panned?
05-24-2016 09:16 AM
Which Impala roles do you have on that node?
You can review the Impala Concepts and Architecture  and to make sure that you're familiar with what each deamon is for, before deleting it.
05-24-2016 10:02 AM
| By deleting the impala role from a host, i need to reconfigure something ?
There shouldn't be any further requirements.
| the cluster just ignores the deleted host when the query is panned?