API Reference

API reference for the DC/OS Apache HDFS service

The DC/OS Apache HDFS Service implements a REST API that may be accessed from outside the cluster. The <dcos_url> parameter referenced below indicates the base URL of the DC/OS cluster on which the Apache HDFS Service is deployed.

REST API Authentication

REST API requests must be authenticated. This authentication is only applicable for interacting with the Apache HDFS REST API directly. You do not need the token to access the Apache HDFS nodes themselves.

If you are using Enterprise DC/OS, follow these instructions to create a service account and an authentication token. You can then configure your service to automatically refresh the authentication token when it expires. To get started more quickly, you can also get the authentication token without a service account, but you will need to manually refresh the token.

If you are using open source DC/OS, follow these instructions to pass your HTTP API token to the DC/OS endpoint.

Once you have the authentication token, you can store it in an environment variable and reference it in your REST API calls:

$ export auth_token=uSeR_t0k3n

The curl examples in this document assume that an auth token has been stored in an environment variable named auth_token.

If you are using Enterprise DC/OS, the security mode of your installation may also require the --ca-cert flag when making REST calls. Refer to Obtaining and passing the DC/OS certificate in cURL requests for information on how to use the --cacert flag. If your security mode is disabled, do not use the --ca-cert flag.

Plan API

The Plan API provides endpoints for monitoring and controlling service installation and configuration updates.

List plans

You may list the configured plans for the service. By default, all services at least have a deploy plan and a recovery plan. Some services may have additional custom plans defined.

$ curl -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/plans
$ dcos hdfs --name=hdfs plan list

View plan

You may view the current state of a listed plan:

$ curl -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/plans/<plan>

The CLI may be used to show a formatted tree of the plan (default), or the underlying JSON data as retrieved from the above HTTP endpoint:

$ dcos hdfs --name=hdfs plan show <plan>
$ dcos hdfs --name=hdfs plan show <plan> --json

Pause plan

The installation will pause after completing the operation of the current node and wait for user input before proceeding further.

$ curl -X POST -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/plans/deploy/interrupt
$ dcos hdfs --name=hdfs plan pause deploy

Resume plan

The REST API request below will resume the operation at the next pending node.

$ curl -X PUT -H "Authorization:token=$auth_token" <dcos_surl>/service/hdfs/v1/plans/deploy/continue
$ dcos hdfs --name=hdfs plan continue deploy

Nodes API

The pod API provides endpoints for retrieving information about nodes, restarting them, and replacing them.

List Nodes

A list of available node ids can be retrieved by sending a GET request to /v1/pod:

CLI Example

$ dcos hdfs --name=hdfs pod list

HTTP Example

$ curl -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/pod

Node Info

You can retrieve node information by sending a GET request to /v1/pod/<node-id>/info:

$ curl  -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/pod/<node-id>/info

CLI Example

$ dcos hdfs --name=hdfs pod info journalnode-0

HTTP Example

$ curl  -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/pod/journalnode-0/info

Replace a Node

The replace endpoint command can be used to replace a node with an instance running on another agent node.

CLI Example

$ dcos hdfs --name=hdfs pod replace <node-id>

HTTP Example

$ curl -X POST -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/pod/<node-id>/replace

If the operation succeeds, a 200 OK is returned.

Restart a Node

The restart endpoint command can be used to restart a node in place on the same agent node.

CLI Example

$ dcos hdfs --name=hdfs pod restart <node-id>

HTTP Example

$ curl -X POST -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/pod/<node-id>/restart

If the operation succeeds a 200 OK is returned.

Pause a Node

The pause endpoint command can be used to relaunch a node in an idle command state for debugging purposes.

CLI example

dcos hdfs --name=hdfs debug pod pause <node-id>

HTTP Example

$ curl -X POST -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/pod/<node-id>/pause

Configuration API

The configuration API provides an endpoint to view current and previous configurations of the cluster.

View Target Config

You can view the current target configuration by sending a GET request to /v1/configurations/target.

CLI Example

$ dcos hdfs --name=hdfs config target

HTTP Example

$ curl -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/configurations/target

List Configs

You can list all configuration IDs by sending a GET request to /v1/configurations.

CLI Example

$ dcos hdfs --name=hdfs config list
[
  "319ebe89-42e2-40e2-9169-8568e2421023",
  "294235f2-8504-4194-b43d-664443f2132b"
]

HTTP Example

$ curl -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/configurations
[
  "319ebe89-42e2-40e2-9169-8568e2421023",
  "294235f2-8504-4194-b43d-664443f2132b"
]

View Specified Config

You can view a specific configuration by sending a GET request to /v1/configurations/<config-id>.

CLI Example

$ dcos hdfs --name=hdfs config show 9a8d4308-ab9d-4121-b460-696ec3368ad6

HTTP Example

$ curl -H "Authorization:token=$auth_token" <dcos_url>/service/hdfs/v1/configurations/9a8d4308-ab9d-4121-b460-696ec3368ad6