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From Chadwick Banning <>
Subject Re: Remove and re-add node
Date Wed, 14 Aug 2013 13:24:44 GMT
Thank you for all your help -- I appreciate it.

Does Ambari support completely removing hosts via the API?  I could
conceivably decommission the node, then remove it completely from Ambari
(if this can be done), then re-install and join it to the cluster under a
new name.

Assuming this is possible, would I then later be able to join another node
to the cluster under the old name that was removed?

On Wed, Aug 14, 2013 at 2:43 AM, Sumit Mohanty <>wrote:

> 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
> Feel free to to open JIRAs if you identify any improvements.
> From: Chadwick Banning <>
> Reply-To: <>
> Date: Tuesday, August 13, 2013 8:31 AM
> To: <>
> 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 <>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 <>
>> Reply-To: <>
>> Date: Tuesday, August 13, 2013 7:01 AM
>> To: <>
>> 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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