question Re: Remove Impala from a single host in Archives of Support Questions (Read Only)

Remove Impala from a single host

Vinn — Fri, 16 Sep 2022 10:21:17 GMT

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 :
http://www.cloudera.com/documentation/enterprise/latest/topics/cm_mc_role_instances.html#cmug_topic_5_2__section_lv5_hvt_cn
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,

Vinn

Re: Remove Impala from a single host

michalis — Tue, 24 May 2016 15:11:28 GMT

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?

Re: Remove Impala from a single host

Vinn — Tue, 24 May 2016 16:10:03 GMT

Thanks Michalis,

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?

Re: Remove Impala from a single host

michalis — Tue, 24 May 2016 16:16:02 GMT

Which Impala roles do you have on that node?

You can review the Impala Concepts and Architecture [1] and to make sure that you're familiar with what each deamon is for, before deleting it.

[1] http://www.cloudera.com/documentation/enterprise/latest/topics/impala_components.html#intro_components

Re: Remove Impala from a single host

Vinn — Tue, 24 May 2016 16:22:19 GMT

only the impala daemon.

Re: Remove Impala from a single host

michalis — Tue, 24 May 2016 17:02:05 GMT

| 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?

That is correct

Re: Remove Impala from a single host

Vinn — Wed, 25 May 2016 07:29:34 GMT

Thank you Michalis.