hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManagerRest.md

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NodeManager REST API's
=======================

* [Overview](#Overview)
* [Enabling CORS support](#Enabling_CORS_support)
* [NodeManager Information API](#NodeManager_Information_API)
* [Applications API](#Applications_API)
* [Application API](#Application_API)
* [Containers API](#Containers_API)
* [Container API](#Container_API)

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:

```json
{
   "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
<?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](#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](#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:

```json
{
   "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
<?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:

```json
{
   "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
<?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](#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](#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:

```json
{
   "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
<?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:

```json
{
   "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
<?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>
```