Apache Hadoop 2.7.5 – NodeManager REST APIs

Overview

The NodeManager REST API’s allow the user to get status on the node and information about applications and containers running on that node.

Enabling CORS support

To enable cross-origin support (CORS) for the NM only(without enabling it for the RM), please set the following configuration parameters:

In core-site.xml, add org.apache.hadoop.security.HttpCrossOriginFilterInitializer to hadoop.http.filter.initializers. In yarn-site.xml, set yarn.nodemanager.webapp.cross-origin.enabled to true.

NodeManager Information API

The node information resource provides overall information about that particular node.

URI

Both of the following URI’s give you the cluster information.

  * http://<nm http address:port>/ws/v1/node
  * http://<nm http address:port>/ws/v1/node/info

HTTP Operations Supported

  * GET

Query Parameters Supported

  None

Elements of the nodeInfo object

Properties	Data Type	Description
id	long	The NodeManager id
nodeHostName	string	The host name of the NodeManager
totalPmemAllocatedContainersMB	long	The amount of physical memory allocated for use by containers in MB
totalVmemAllocatedContainersMB	long	The amount of virtual memory allocated for use by containers in MB
totalVCoresAllocatedContainers	long	The number of virtual cores allocated for use by containers
lastNodeUpdateTime	long	The last timestamp at which the health report was received (in ms since epoch)
healthReport	string	The diagnostic health report of the node
nodeHealthy	boolean	true/false indicator of if the node is healthy
nodeManagerVersion	string	Version of the NodeManager
nodeManagerBuildVersion	string	NodeManager build string with build version, user, and checksum
nodeManagerVersionBuiltOn	string	Timestamp when NodeManager was built(in ms since epoch)
hadoopVersion	string	Version of hadoop common
hadoopBuildVersion	string	Hadoop common build string with build version, user, and checksum
hadoopVersionBuiltOn	string	Timestamp when hadoop common was built(in ms since epoch)

Response Examples

JSON response

HTTP Request:

  GET http://<nm http address:port>/ws/v1/node/info

Response Header:

  HTTP/1.1 200 OK
  Content-Type: application/json
  Transfer-Encoding: chunked
  Server: Jetty(6.1.26)

Response Body:

{
   "nodeInfo" : {
      "hadoopVersionBuiltOn" : "Mon Jan  9 14:58:42 UTC 2012",
      "nodeManagerBuildVersion" : "0.23.1-SNAPSHOT from 1228355 by user1 source checksum 20647f76c36430e888cc7204826a445c",
      "lastNodeUpdateTime" : 1326222266126,
      "totalVmemAllocatedContainersMB" : 17203,
      "totalVCoresAllocatedContainers" : 8,
      "nodeHealthy" : true,
      "healthReport" : "",
      "totalPmemAllocatedContainersMB" : 8192,
      "nodeManagerVersionBuiltOn" : "Mon Jan  9 15:01:59 UTC 2012",
      "nodeManagerVersion" : "0.23.1-SNAPSHOT",
      "id" : "host.domain.com:8041",
      "hadoopBuildVersion" : "0.23.1-SNAPSHOT from 1228292 by user1 source checksum 3eba233f2248a089e9b28841a784dd00",
      "nodeHostName" : "host.domain.com",
      "hadoopVersion" : "0.23.1-SNAPSHOT"
   }
}

XML response

HTTP Request:

  Accept: application/xml
  GET http://<nm http address:port>/ws/v1/node/info

Response Header:

  HTTP/1.1 200 OK
  Content-Type: application/xml
  Content-Length: 983
  Server: Jetty(6.1.26)

Response Body:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<nodeInfo>
  <healthReport/>
  <totalVmemAllocatedContainersMB>17203</totalVmemAllocatedContainersMB>
  <totalPmemAllocatedContainersMB>8192</totalPmemAllocatedContainersMB>
  <totalVCoresAllocatedContainers>8</totalVCoresAllocatedContainers>
  <lastNodeUpdateTime>1326222386134</lastNodeUpdateTime>
  <nodeHealthy>true</nodeHealthy>
  <nodeManagerVersion>0.23.1-SNAPSHOT</nodeManagerVersion>
  <nodeManagerBuildVersion>0.23.1-SNAPSHOT from 1228355 by user1 source checksum 20647f76c36430e888cc7204826a445c</nodeManagerBuildVersion>
  <nodeManagerVersionBuiltOn>Mon Jan  9 15:01:59 UTC 2012</nodeManagerVersionBuiltOn>
  <hadoopVersion>0.23.1-SNAPSHOT</hadoopVersion>
  <hadoopBuildVersion>0.23.1-SNAPSHOT from 1228292 by user1 source checksum 3eba233f2248a089e9b28841a784dd00</hadoopBuildVersion>
  <hadoopVersionBuiltOn>Mon Jan  9 14:58:42 UTC 2012</hadoopVersionBuiltOn>
  <id>host.domain.com:8041</id>
  <nodeHostName>host.domain.com</nodeHostName>
</nodeInfo>

Applications API

With the Applications API, you can obtain a collection of resources, each of which represents an application. When you run a GET operation on this resource, you obtain a collection of Application Objects. See also Application API for syntax of the application object.

URI

  * http://<nm http address:port>/ws/v1/node/apps

HTTP Operations Supported

  * GET

Query Parameters Supported

Multiple paramters can be specified.

  * state - application state 
  * user - user name

Elements of the apps (Applications) object

When you make a request for the list of applications, the information will be returned as a collection of app objects. See also Application API for syntax of the app object.

Properties	Data Type	Description
app	array of app objects(JSON)/zero or more app objects(XML)	A collection of application objects

Response Examples

JSON response

HTTP Request:

  GET http://<nm http address:port>/ws/v1/node/apps

Response Header:

  HTTP/1.1 200 OK
  Content-Type: application/json
  Transfer-Encoding: chunked
  Server: Jetty(6.1.26)

Response Body:

{
   "apps" : {
      "app" : [
         {
            "containerids" : [
               "container_1326121700862_0003_01_000001",
               "container_1326121700862_0003_01_000002"
            ],
            "user" : "user1",
            "id" : "application_1326121700862_0003",
            "state" : "RUNNING"
         },
         {
            "user" : "user1",
            "id" : "application_1326121700862_0002",
            "state" : "FINISHED"
         }
      ]
   }
}

XML response

HTTP Request:

  GET http://<nm http address:port>/ws/v1/node/apps
  Accept: application/xml

Response Header:

  HTTP/1.1 200 OK
  Content-Type: application/xml
  Content-Length: 400
  Server: Jetty(6.1.26)

Response Body:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<apps>
  <app>
    <id>application_1326121700862_0002</id>
    <state>FINISHED</state>
    <user>user1</user>
  </app>
  <app>
    <id>application_1326121700862_0003</id>
    <state>RUNNING</state>
    <user>user1</user>
    <containerids>container_1326121700862_0003_01_000002</containerids>
    <containerids>container_1326121700862_0003_01_000001</containerids>
  </app>
</apps>

Application API

An application resource contains information about a particular application that was run or is running on this NodeManager.

URI

Use the following URI to obtain an app Object, for a application identified by the appid value.

  * http://<nm http address:port>/ws/v1/node/apps/{appid}

HTTP Operations Supported

  * GET

Query Parameters Supported

  None

Elements of the app (Application) object

Properties	Data Type	Description
id	string	The application id
user	string	The user who started the application
state	string	The state of the application - valid states are: NEW, INITING, RUNNING, FINISHING_CONTAINERS_WAIT, APPLICATION_RESOURCES_CLEANINGUP, FINISHED
containerids	array of containerids(JSON)/zero or more containerids(XML)	The list of containerids currently being used by the application on this node. If not present then no containers are currently running for this application.

Response Examples

JSON response

HTTP Request:

  GET http://<nm http address:port>/ws/v1/node/apps/application_1326121700862_0005

Response Header:

  HTTP/1.1 200 OK
  Content-Type: application/json
  Transfer-Encoding: chunked
  Server: Jetty(6.1.26)

Response Body:

{
   "app" : {
      "containerids" : [
         "container_1326121700862_0005_01_000003",
         "container_1326121700862_0005_01_000001"
      ],
      "user" : "user1",
      "id" : "application_1326121700862_0005",
      "state" : "RUNNING"
   }
}

XML response

HTTP Request:

  GET http://<nm http address:port>/ws/v1/node/apps/application_1326121700862_0005
  Accept: application/xml

Response Header:

  HTTP/1.1 200 OK
  Content-Type: application/xml
  Content-Length: 281 
  Server: Jetty(6.1.26)

Response Body:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<app>
  <id>application_1326121700862_0005</id>
  <state>RUNNING</state>
  <user>user1</user>
  <containerids>container_1326121700862_0005_01_000003</containerids>
  <containerids>container_1326121700862_0005_01_000001</containerids>
</app>

Containers API

With the containers API, you can obtain a collection of resources, each of which represents a container. When you run a GET operation on this resource, you obtain a collection of Container Objects. See also Container API for syntax of the container object.

URI

  * http://<nm http address:port>/ws/v1/node/containers

HTTP Operations Supported

  * GET

Query Parameters Supported

  None

Elements of the containers object

When you make a request for the list of containers, the information will be returned as collection of container objects. See also Container API for syntax of the container object.

Properties	Data Type	Description
containers	array of container objects(JSON)/zero or more container objects(XML)	A collection of container objects

Response Examples

JSON response

HTTP Request:

  GET http://<nm http address:port>/ws/v1/node/containers

Response Header:

  HTTP/1.1 200 OK
  Content-Type: application/json
  Transfer-Encoding: chunked
  Server: Jetty(6.1.26)

Response Body:

{
   "containers" : {
      "container" : [
         {
            "nodeId" : "host.domain.com:8041",
            "totalMemoryNeededMB" : 2048,
            "totalVCoresNeeded" : 1,
            "state" : "RUNNING",
            "diagnostics" : "",
            "containerLogsLink" : "http://host.domain.com:8042/node/containerlogs/container_1326121700862_0006_01_000001/user1",
            "user" : "user1",
            "id" : "container_1326121700862_0006_01_000001",
            "exitCode" : -1000
         },
         {
            "nodeId" : "host.domain.com:8041",
            "totalMemoryNeededMB" : 2048,
            "totalVCoresNeeded" : 2,
            "state" : "RUNNING",
            "diagnostics" : "",
            "containerLogsLink" : "http://host.domain.com:8042/node/containerlogs/container_1326121700862_0006_01_000003/user1",
            "user" : "user1",
            "id" : "container_1326121700862_0006_01_000003",
            "exitCode" : -1000
         }
      ]
   }
}

XML response

HTTP Request:

  GET http://<nm http address:port>/ws/v1/node/containers
  Accept: application/xml

Response Header:

  HTTP/1.1 200 OK
  Content-Type: application/xml
  Content-Length: 988
  Server: Jetty(6.1.26)

Response Body:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<containers>
  <container>
    <id>container_1326121700862_0006_01_000001</id>
    <state>RUNNING</state>
    <exitCode>-1000</exitCode>
    <diagnostics/>
    <user>user1</user>
    <totalMemoryNeededMB>2048</totalMemoryNeededMB>
    <totalVCoresNeeded>1</totalVCoresNeeded>
    <containerLogsLink>http://host.domain.com:8042/node/containerlogs/container_1326121700862_0006_01_000001/user1</containerLogsLink>
    <nodeId>host.domain.com:8041</nodeId>
  </container>
  <container>
    <id>container_1326121700862_0006_01_000003</id>
    <state>DONE</state>
    <exitCode>0</exitCode>
    <diagnostics>Container killed by the ApplicationMaster.</diagnostics>
    <user>user1</user>
    <totalMemoryNeededMB>2048</totalMemoryNeededMB>
    <totalVCoresNeeded>2</totalVCoresNeeded>
    <containerLogsLink>http://host.domain.com:8042/node/containerlogs/container_1326121700862_0006_01_000003/user1</containerLogsLink>
    <nodeId>host.domain.com:8041</nodeId>
  </container>
</containers>

Container API

A container resource contains information about a particular container that is running on this NodeManager.

URI

Use the following URI to obtain a Container Object, from a container identified by the containerid value.

  * http://<nm http address:port>/ws/v1/node/containers/{containerid}

HTTP Operations Supported

  * GET

Query Parameters Supported

  None

Elements of the container object

Properties	Data Type	Description
id	string	The container id
state	string	State of the container - valid states are: NEW, LOCALIZING, LOCALIZATION_FAILED, LOCALIZED, RUNNING, EXITED_WITH_SUCCESS, EXITED_WITH_FAILURE, KILLING, CONTAINER_CLEANEDUP_AFTER_KILL, CONTAINER_RESOURCES_CLEANINGUP, DONE
nodeId	string	The id of the node the container is on
containerLogsLink	string	The http link to the container logs
user	string	The user name of the user which started the container
exitCode	int	Exit code of the container
diagnostics	string	A diagnostic message for failed containers
totalMemoryNeededMB	long	Total amout of memory needed by the container (in MB)
totalVCoresNeeded	long	Total number of virtual cores needed by the container

Response Examples

JSON response

HTTP Request:

  GET http://<nm http address:port>/ws/v1/nodes/containers/container_1326121700862_0007_01_000001

Response Header:

  HTTP/1.1 200 OK
  Content-Type: application/json
  Transfer-Encoding: chunked
  Server: Jetty(6.1.26)

Response Body:

{
   "container" : {
      "nodeId" : "host.domain.com:8041",
      "totalMemoryNeededMB" : 2048,
      "totalVCoresNeeded" : 1,
      "state" : "RUNNING",
      "diagnostics" : "",
      "containerLogsLink" : "http://host.domain.com:8042/node/containerlogs/container_1326121700862_0007_01_000001/user1",
      "user" : "user1",
      "id" : "container_1326121700862_0007_01_000001",
      "exitCode" : -1000
   }
}

XML response

HTTP Request:

  GET http://<nm http address:port>/ws/v1/node/containers/container_1326121700862_0007_01_000001
  Accept: application/xml

Response Header:

  HTTP/1.1 200 OK
  Content-Type: application/xml
  Content-Length: 491 
  Server: Jetty(6.1.26)

Response Body:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<container>
  <id>container_1326121700862_0007_01_000001</id>
  <state>RUNNING</state>
  <exitCode>-1000</exitCode>
  <diagnostics/>
  <user>user1</user>
  <totalMemoryNeededMB>2048</totalMemoryNeededMB>
  <totalVCoresNeeded>1</totalVCoresNeeded>
  <containerLogsLink>http://host.domain.com:8042/node/containerlogs/container_1326121700862_0007_01_000001/user1</containerLogsLink>
  <nodeId>host.domain.com:8041</nodeId>
</container>

General

Common

HDFS

MapReduce

MapReduce REST APIs

YARN

YARN REST APIs

Hadoop Compatible File Systems

Auth

Tools

Reference

Configuration

NodeManager REST API’s

Overview

Enabling CORS support

NodeManager Information API

URI

HTTP Operations Supported

Query Parameters Supported

Elements of the nodeInfo object

Response Examples

Applications API

URI

HTTP Operations Supported

Query Parameters Supported

Elements of the apps (Applications) object

Response Examples

Application API

URI

HTTP Operations Supported

Query Parameters Supported

Elements of the app (Application) object

Response Examples

Containers API

URI

HTTP Operations Supported

Query Parameters Supported

Elements of the containers object

Response Examples

Container API

URI

HTTP Operations Supported

Query Parameters Supported

Elements of the container object

Response Examples