Remove Impala from a single host

[#1]

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

[#2 · Accepted solution]

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?

[#3 · Accepted solution]

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?

[#4]

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?

[#5]

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...

[#6]

only the impala daemon.

[#7 · Accepted solution]

| 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

[#8 · Accepted solution]

| 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

[#9]

Thank you Michalis.