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Date: Wed, 14 Aug 2013 15:56:07 -0700
Subject: Re: HDP Cluster scaling
From: Sumit Mohanty <smohanty@hortonworks.com>
To: <ambari-dev@incubator.apache.org>
Message-ID: <CE315815.27B3C%smohanty@hortonworks.com>
Thread-Topic: HDP Cluster scaling
In-Reply-To: <E5B4D257-5539-4776-AB79-4FFC952CA629@hortonworks.com>
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Unfortunately, host delete feature is not yet available. Likely,
availability is after 1.2.5.

The expectation is that host can be deleted after the mapped components
are deleted. 

-Sumit

On 8/14/13 3:50 PM, "Jon Maron" <jmaron@hortonworks.com> wrote:

>Thanks!
>
>Follow up question:
>
>To scale down, do I simply have to leverage the REST API to DELETE the
>given host?
>
>-- Jon
>
>On Aug 14, 2013, at 5:30 PM, Sumit Mohanty <smohanty@hortonworks.com>
>wrote:
>
>> 1)  Is it the ideal approach?  Is there a more direct way of interacting
>> with ambari to provision a new host?
>> 
>> The steps you have is the ideal approach. Alternatively, there is
>> bootstrap API but it will also require Ambari to have SSH access. Even
>> then the number of steps will not be smaller.
>> 
>>  2)  I am having an issue with the final step.  During the invocation I
>> get the following error:
>> 
>> 
>> You are right. The client components do not transition to STARTED. So
>>you
>> need to only issue INSTALLED-->STARTED for the non client components.
>> 
>> -Sumit
>> 
>> On 8/14/13 12:57 PM, "Jon Maron" <jmaron@hortonworks.com> wrote:
>> 
>>> Hi,
>>> 
>>> I'm working on the Savanna HDP plugin, currently working on the
>>> capability to scale a cluster (add hosts, remove hosts).  The current
>>> approach to adding a host is to:
>>> 
>>> 1)  Install the ambari agent on the host
>>> 2)  start the ambari agent
>>> 3) register the host
>>> 4)  add the required host components (based on the node group to which
>>> it is being added)
>>> 5)  install components (transition state from INIT to INSTALLED)
>>> 6)  start the components (transition state from INSTALLED to STARTED)
>>> 
>>> I have a couple of questions regarding this approach:
>>> 
>>> 1)  Is it the ideal approach?  Is there a more direct way of
>>> interacting with ambari to provision a new host?
>>> 
>>> 2)  I am having an issue with the final step.  During the invocation I
>>> get the following error:
>>> 
>>> <html>
>>> <head>
>>> <meta http-equiv="Content-Type"
>>>content="text/html;charset=ISO-8859-1"/>
>>> <title>Error 500 Invalid desired state for a client component</title>
>>> </head>
>>> <body>
>>> <h2>HTTP ERROR: 500</h2>
>>> <p>Problem accessing
>>> 
>>>/api/v1/clusters/my-cluster/hosts/my-cluster-slave-003.novalocal/host_co
>>>mp
>>> onents. Reason:
>>> <pre>    Invalid desired state for a client component</pre></p>
>>> <hr /><i><small>Powered by Jetty://</small></i>
>>> 
>>> The mix of components that are in the installed state is:
>>> 
>>> {
>>> "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal/host_components?HostRoles/state=INSTALLED",
>>> "items" : [
>>>   {
>>>     "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal/host_components/DATANODE",
>>>     "HostRoles" : {
>>>       "cluster_name" : "my-cluster",
>>>       "component_name" : "DATANODE",
>>>       "state" : "INSTALLED",
>>>       "host_name" : "my-cluster-slave-003.novalocal"
>>>     },
>>>     "host" : {
>>>       "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal"
>>>     }
>>>   },
>>>   {
>>>     "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal/host_components/MAPREDUCE_CLIENT",
>>>     "HostRoles" : {
>>>       "cluster_name" : "my-cluster",
>>>       "component_name" : "MAPREDUCE_CLIENT",
>>>       "state" : "INSTALLED",
>>>       "host_name" : "my-cluster-slave-003.novalocal"
>>>     },
>>>     "host" : {
>>>       "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal"
>>>     }
>>>   },
>>>   {
>>>     "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal/host_components/HDFS_CLIENT",
>>>     "HostRoles" : {
>>>       "cluster_name" : "my-cluster",
>>>       "component_name" : "HDFS_CLIENT",
>>>       "state" : "INSTALLED",
>>>       "host_name" : "my-cluster-slave-003.novalocal"
>>>     },
>>>     "host" : {
>>>       "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal"
>>>     }
>>>   },
>>>   {
>>>     "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal/host_components/GANGLIA_MONITOR",
>>>     "HostRoles" : {
>>>       "cluster_name" : "my-cluster",
>>>       "component_name" : "GANGLIA_MONITOR",
>>>       "state" : "INSTALLED",
>>>       "host_name" : "my-cluster-slave-003.novalocal"
>>>     },
>>>     "host" : {
>>>       "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal"
>>>     }
>>>   },
>>>   {
>>>     "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal/host_components/TASKTRACKER",
>>>     "HostRoles" : {
>>>       "cluster_name" : "my-cluster",
>>>       "component_name" : "TASKTRACKER",
>>>       "state" : "INSTALLED",
>>>       "host_name" : "my-cluster-slave-003.novalocal"
>>>     },
>>>     "host" : {
>>>       "href" : 
>>> 
>>>"http://172.18.3.5:8080/api/v1/clusters/my-cluster/hosts/my-cluster-slav
>>>e-
>>> 003.novalocal"
>>>     }
>>>   }
>>> ]
>>> }
>>> 
>>> So it appears that "CLIENT" components are not transitioned into the
>>> STARTED state?  Do I need to iterate thru these and avoid starting
>>> components with CLIENT in their name?
>>> 
>>> -- Jon
>>> -- 
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>> 
>> 
>> 
>> -- 
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>
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