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view-resources.md

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View Resources

#####Get Views The user may query for all of the deployed views. Note that views are a top level resources (they are not sub-resources of a cluster).

GET http://<server>:8080/api/v1/views/

{
  "href" : "http://<server>:8080/api/v1/views/",
  "items" : [
    {
      "href" : "http://<server>:8080/api/v1/views/FILES",
      "ViewInfo" : {
        "view_name" : "FILES"
      }
    },
    {
      "href" : "http://<server>:8080/api/v1/views/HELLO_WORLD",
      "ViewInfo" : {
        "view_name" : "HELLO_WORLD"
      }
    }
  ]
}

#####Get View To get a specific view, request it by name. Note that the response shows all of the versions of the view as sub-resources.

GET http://<server>:8080/api/v1/views/FILES/

{
  "href" : "http://<server>:8080/api/v1/views/FILES/",
  "ViewInfo" : {
    "view_name" : "FILES"
  },
  "versions" : [
    {
      "href" : "http://<server>:8080/api/v1/views/FILES/versions/0.1.0",
      "ViewVersionInfo" : {
        "version" : "0.1.0",
        "view_name" : "FILES"
      }
    }
  ]
}

#####Get Versions The user may request all of the versions of a named view.

GET http://<server>:8080/api/v1/views/FILES/versions/

{
  "href" : "http://<server>:8080/api/v1/views/FILES/versions/",
  "items" : [
    {
      "href" : "http://<server>:8080/api/v1/views/FILES/versions/0.1.0",
      "ViewVersionInfo" : {
        "version" : "0.1.0",
        "view_name" : "FILES"
      }
    }
  ]
}

#####Get Version A specific version can be requested. Note that all of the instances of the view version are included in the response.

GET http://<server>:8080/api/v1/views/FILES/versions/0.1.0/

{
  "href" : "http://<server>:8080/api/v1/views/FILES/versions/0.1.0/",
  "ViewVersionInfo" : {
    "archive" : "/var/lib/ambari-server/resources/views/work/FILES{0.1.0}",
    "label" : "Files",
    "parameters" : [
      {
        "name" : "dataworker.defaultFs",
        "description" : "FileSystem URI",
        "required" : true
      },
      {
        "name" : "dataworker.username",
        "description" : "The username (defaults to ViewContext username)",
        "required" : false
      }
    ],
    "version" : "0.1.0",
    "view_name" : "FILES"
  },
  "instances" : [
    {
      "href" : "http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/FILES_1",
      "ViewInstanceInfo" : {
        "instance_name" : "FILES_1",
        "version" : "0.1.0",
        "view_name" : "FILES"
      }
    }
  ]
}

#####Get Instances The user may request all of the instances of a view.

GET http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/

{
  "href" : "http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/",
  "items" : [
    {
      "href" : "http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/FILES_1",
      "ViewInstanceInfo" : {
        "instance_name" : "FILES_1",
        "version" : "0.1.0",
        "view_name" : "FILES"
      }
    }
  ]
}

#####Get Instance A specific view instance may be requested by specifying its name. Note that the instance resources are listed as sub-resources.

GET http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/FILES_1

{
  "href" : "http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/FILES_1",
  "ViewInstanceInfo" : {
    "context_path" : "/views/FILES/0.1.0/FILES_1",
    "instance_name" : "FILES_1",
    "version" : "0.1.0",
    "view_name" : "FILES",
    "instance_data" : { },
    "properties" : {
      "dataworker.defaultFs" : "hdfs://<server>:8020"
    }
  },
  "resources" : [
    {
      "href" : "http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/FILES_1/resources/files",
      "instance_name" : "FILES_1",
      "name" : "files",
      "version" : "0.1.0",
      "view_name" : "FILES"
    }
  ]
}

#####Create Instance New view instances may be created through the API.

POST http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/FILES_2

#####Update Instance The properties of a view instance may be updated through the API.

PUT http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/FILES_2
[{
  "ViewInstanceInfo" : {
      "properties" : {
        "dataworker.defaultFs" : "hdfs://MyServer:8020"
      }
    }
}]

#####Delete Instance A view instances may be deleted through the API.

DELETE http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/FILES_2

#####Resources A view resource may be accessed through the REST API. The href for each view resource can be found in a request for the parent view instance. The resource endpoints and behavior depends on the implementation of the JAX-RS annotated service class specified for the resource element in the view.xml.

GET http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/FILES_1/resources/files/fileops/listdir?path=%2F

[{"path":"/app-logs","replication":0,"isDirectory":true,"len":0,"owner":"yarn","group":"hadoop","permission":"-rwxrwxrwx","accessTime":0,"modificationTime":1400006792122,"blockSize":0},{"path":"/mapred","replication":0,"isDirectory":true,"len":0,"owner":"mapred","group":"hdfs","permission":"-rwxr-xr-x","accessTime":0,"modificationTime":1400006653817,"blockSize":0},{"path":"/mr-history","replication":0,"isDirectory":true,"len":0,"owner":"hdfs","group":"hdfs","permission":"-rwxr-xr-x","accessTime":0,"modificationTime":1400006653822,"blockSize":0},{"path":"/tmp","replication":0,"isDirectory":true,"len":0,"owner":"hdfs","group":"hdfs","permission":"-rwxrwxrwx","accessTime":0,"modificationTime":1400006720415,"blockSize":0},{"path":"/user","replication":0,"isDirectory":true,"len":0,"owner":"hdfs","group":"hdfs","permission":"-rwxr-xr-x","accessTime":0,"modificationTime":1400006610050,"blockSize":0}]

#####Managed Resources Any managed resources for a view may also be accessed through the REST API. Note that instances of a managed resource appear as sub-resources of an instance under the plural name specified for the resource in the view.xml. In this example, a list of managed resources named 'scripts' is included in the response for the view instance …

GET http://<server>:8080/api/v1/views/PIG/versions/0.1.0/instances/INSTANCE_1

{
  "href" : "http://<server>:8080/api/v1/views/PIG/versions/0.1.0/instances/INSTANCE_1",
  "ViewInstanceInfo" : {
    "context_path" : "/views/PIG/0.1.0/INSTANCE_1",
    "instance_name" : "INSTANCE_1",
    "version" : "0.1.0",
    "view_name" : "PIG",
    "instance_data" : { },
    "properties" : {
      … 
    }
  },
  "resources" : [ ],
  "scripts" : [
    {
      "href" : "http://<server>:8080/api/v1/views/PIG/versions/0.1.0/instances/INSTANCE_1/scripts/script1",
      "id" : "script1",
      "instance_name" : "INSTANCE_1",
      "version" : "0.1.0",
      "view_name" : "PIG"
    },
    {
      "href" : "http://<server>:8080/api/v1/views/FILES/versions/0.1.0/instances/INSTANCE_1/scripts/script2",
      "id" : "script2",
      "instance_name" : "INSTANCE_1",
      "version" : "0.1.0",
      "view_name" : "PIG"
    },
    …
  ]
}

To get a single managed resource …

GET http://<server>:8080/api/v1/views/PIG/versions/0.1.0/instances/INSTANCE_1/scripts/script1


{
  "href" : "http://<server>:8080/api/v1/views/PIG/versions/0.1.0/instances/INSTANCE_1/scripts/script1",
  "id" : "script1",      
  "pigScript" : "… ",
  "pythonScript" : "… ",
  "templetonArguments" : "… ",
  "dateCreated" : … ,
  "owner" : "… ",
  "instance_name" : "INSTANCE_1",
  "version" : "0.1.0",
  "view_name" : "PIG"
}

Because the resource is managed through the Ambari API framework, it may be queried using partial response and query predicates. For example …

GET http://<server>:8080/api/v1/views/PIG/versions/0.1.0/instances/INSTANCE_1/scripts?fields=pythonScript&owner=jsmith