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Explorer
Posts: 10
Registered: ‎05-24-2016
Accepted Solution

Remove Impala from a single host

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_...
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

Cloudera Employee
Posts: 289
Registered: ‎07-08-2013

Re: Remove Impala from a single host

 

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?

 

Explorer
Posts: 10
Registered: ‎05-24-2016

Re: Remove Impala from a single host

[ Edited ]

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?

Cloudera Employee
Posts: 289
Registered: ‎07-08-2013

Re: Remove Impala from a single host

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_componen...

Explorer
Posts: 10
Registered: ‎05-24-2016

Re: Remove Impala from a single host

only the impala daemon.


Cloudera Employee
Posts: 289
Registered: ‎07-08-2013

Re: Remove Impala from a single host

| 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
Explorer
Posts: 10
Registered: ‎05-24-2016

Re: Remove Impala from a single host

Thank you Michalis.

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