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From Sumit Mohanty <smoha...@hortonworks.com>
Subject Re: Remove and re-add node
Date Wed, 14 Aug 2013 06:43:04 GMT
At this point, Ambari does not support deleting components. So when the host
is brought back up online then Ambari will think that the components are
already deployed and it will not allow you to deploy again. However, if the
host comes back up with a different name you can use the Add Host feature to
add the host to the cluster as well as deploy the components. This way you
will get the processing capacity back except you will see some components
always in UNKNOWN state (these components are the ones mapped to host that
no longer exists).

I assume you are using Ambari version 1.2.4.9.

Feel free to to open JIRAs if you identify any improvements.

From:  Chadwick Banning <chadwickbanning@gmail.com>
Reply-To:  <ambari-user@incubator.apache.org>
Date:  Tuesday, August 13, 2013 8:31 AM
To:  <ambari-user@incubator.apache.org>
Subject:  Re: Remove and re-add node

The node has the following installed:
* DataNode
* Ganglia Monitor
* HBase Regionserver
* TaskTrack
* Clients: HBase Client, HCat, HDFS Client, MapReduce Client, Oozie Client,
Pig, Sqoop, ZooKeeper Client



On Tue, Aug 13, 2013 at 11:18 AM, Sumit Mohanty <smohanty@hortonworks.com>
wrote:
> Do you have any hadoop component installed on that node? If not, then the
> steps you have described will work. After the agent comes up and registers
> with the same name as before it will work.
> 
> From:  Chadwick Banning <chadwickbanning@gmail.com>
> Reply-To:  <ambari-user@incubator.apache.org>
> Date:  Tuesday, August 13, 2013 7:01 AM
> To:  <ambari-user@incubator.apache.org>
> Subject:  Remove and re-add node
> 
> Quick question --
> 
> Is there a way to remove a node from Ambari and then re-add it?  I have a
> cluster member thats having issues and I would like to remove it, re-install
> the OS, and then re-join it to the cluster.
> 
> Would I be able to just shutdown the machine, re-install the OS (which is on
> disks separate from the data disks), restart the machine, re-install the
> ambari-agent manually and have Ambari take over from there?




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