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The Cluster REST API uses the PUT /api/cluster/flexup and flex down HTTP method and URI to expand and shrink the cluster size 

HTTP Method and URI

PUT /api/cluster/flexup      // Expands the size of the YARN cluster.

PUT /api/cluster/flexdown    // Shrinks the size of the YARN cluster.

 

Parameters include:

ParameterDescription
profileValue: zero, small, medium, large. Default: zero. The instance size in the cluster is defined in the myriad-config-default.yml file.
instancesValue: one (1) to the number of nodes in the cluster. For example, if there are 100 nodes in your cluster, you are bound by 100. If you specify more than 100, the excess is place in a pending state.
constraintsValue: ??. Hostnames are used to define cluster boundary and to start and stop Node Managers on a predefined set of nodes.

 

Syntax

<localhost>:8192/api/cluster/flexup
<localhost>:8192/api/cluster/flexdown

 

Request Examples

Curl request example to flexup two instances with the profile set to small:

curl -X PUT http://10.10.100.19:8192/api/cluster/flexup -d instances=2 -d profile=small

 

Request header to flexdown request:

PUT /api/cluster/flexdown HTTP/1.1
Host: 10.10.100.19:8192
Connection: keep-alive
Content-Length: 17
Origin: http://10.10.100.19:8192
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36
Content-Type: application/json
Accept: */*
Referer: http://10.10.100.19:8192/
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8

 

Request header to flexup:

PUT /api/cluster/flexup HTTP/1.1
Host: 10.10.100.19:8192
Connection: keep-alive
Content-Length: 36
Origin: http://10.10.100.19:8192
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36
Content-Type: application/json
Accept: */*
Referer: http://10.10.100.19:8192/
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8

 

Launches a Node Manager with the profile set to medium on any host in the Mesos cluster:

{profile: "medium", instances: "1"}

 

Launches a Node Manager with the profile set to small on any host in the Mesos cluster:

{
  "instances":1, "profile": "small"
}

Launches a Node Manager with the profile set to zero on any host in the Mesos cluster:

{
  "instances":1
}

Launches four (4) Node Managers with profile set to large only on specific hosts, host-120 through host-129:

{
	"instances":4, 
	"profile": large, 
	"constraints": [hostname LIKE host-12[0-9].example.com]
}

Launches two (2) Node Managers with profile set to zero only on hosts sharing a common Mesos slave attribute (http://mesos.apache.org/documentation/attributes-resources):

{
	"instances":2, 
	"profile": zero, 
	"constraints": [hdfs LIKE true]
}

 

Response Example

202 ACCEPTED
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