Module: Elasticsearch::API::Tasks::Actions

Defined in:
lib/elasticsearch/api/actions/tasks/get.rb,
lib/elasticsearch/api/actions/tasks/list.rb,
lib/elasticsearch/api/actions/tasks/cancel.rb

Instance Method Summary collapse

Instance Method Details

#cancel(arguments = {}) ⇒ Object

Cancel a task. WARNING: The task management API is new and should still be considered a beta feature. The API may change in ways that are not backwards compatible. A task may continue to run for some time after it has been cancelled because it may not be able to safely stop its current activity straight away. It is also possible that Elasticsearch must complete its work on other tasks before it can process the cancellation. The get task information API will continue to list these cancelled tasks until they complete. The cancelled flag in the response indicates that the cancellation command has been processed and the task will stop as soon as possible. To troubleshoot why a cancelled task does not complete promptly, use the get task information API with the ?detailed parameter to identify the other tasks the system is running. You can also use the node hot threads API to obtain detailed information about the work the system is doing instead of completing the cancelled task. This functionality is Experimental and may be changed or removed completely in a future release. Elastic will take a best effort approach to fix any issues, but experimental features are not subject to the support SLA of official GA features.

Parameters:

  • arguments (Hash) (defaults to: {}) —

    a customizable set of options

Options Hash (arguments):

  • :task_id (String, Integer) —

    The task identifier.

  • :actions (String) —

    A comma-separated list or wildcard expression of actions that is used to limit the request.

  • :nodes (Array<String>) —

    A comma-separated list of node IDs or names that is used to limit the request.

  • :parent_task_id (String) —

    A parent task ID that is used to limit the tasks.

  • :wait_for_completion (Boolean) —

    If true, the request blocks until all found tasks are complete.

  • :headers (Hash) —

    Custom HTTP headers

See Also:



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# File 'lib/elasticsearch/api/actions/tasks/cancel.rb', line 48

def cancel(arguments = {})
  request_opts = { endpoint: arguments[:endpoint] || 'tasks.cancel' }

  defined_params = [:task_id].each_with_object({}) do |variable, set_variables|
    set_variables[variable] = arguments[variable] if arguments.key?(variable)
  end
  request_opts[:defined_params] = defined_params unless defined_params.empty?

  arguments = arguments.clone
  headers = arguments.delete(:headers) || {}

  body = nil

  _task_id = arguments.delete(:task_id)

  method = Elasticsearch::API::HTTP_POST
  path   = if _task_id
             "_tasks/#{Utils.listify(_task_id)}/_cancel"
           else
             '_tasks/_cancel'
           end
  params = Utils.process_params(arguments)

  Elasticsearch::API::Response.new(
    perform_request(method, path, params, body, headers, request_opts)
  )
end

#get(arguments = {}) ⇒ Object

Get task information. Get information about a task currently running in the cluster. WARNING: The task management API is new and should still be considered a beta feature. The API may change in ways that are not backwards compatible. If the task identifier is not found, a 404 response code indicates that there are no resources that match the request. This functionality is Experimental and may be changed or removed completely in a future release. Elastic will take a best effort approach to fix any issues, but experimental features are not subject to the support SLA of official GA features.

Parameters:

  • arguments (Hash) (defaults to: {}) —

    a customizable set of options

Options Hash (arguments):

  • :task_id (String) —

    The task identifier. (Required)

  • :timeout (Time) —

    The period to wait for a response. If no response is received before the timeout expires, the request fails and returns an error. Server default: 30s.

  • :wait_for_completion (Boolean) —

    If true, the request blocks until the task has completed.

  • :headers (Hash) —

    Custom HTTP headers

Raises:

  • (ArgumentError)

See Also:



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# File 'lib/elasticsearch/api/actions/tasks/get.rb', line 43

def get(arguments = {})
  request_opts = { endpoint: arguments[:endpoint] || 'tasks.get' }

  defined_params = [:task_id].each_with_object({}) do |variable, set_variables|
    set_variables[variable] = arguments[variable] if arguments.key?(variable)
  end
  request_opts[:defined_params] = defined_params unless defined_params.empty?

  raise ArgumentError, "Required argument 'task_id' missing" unless arguments[:task_id]

  arguments = arguments.clone
  headers = arguments.delete(:headers) || {}

  body = nil

  _task_id = arguments.delete(:task_id)

  method = Elasticsearch::API::HTTP_GET
  path   = "_tasks/#{Utils.listify(_task_id)}"
  params = Utils.process_params(arguments)

  Elasticsearch::API::Response.new(
    perform_request(method, path, params, body, headers, request_opts)
  )
end

#list(arguments = {}) ⇒ Object

Get all tasks. Get information about the tasks currently running on one or more nodes in the cluster. WARNING: The task management API is new and should still be considered a beta feature. The API may change in ways that are not backwards compatible. **Identifying running tasks** The X-Opaque-Id header, when provided on the HTTP request header, is going to be returned as a header in the response as well as in the headers field for in the task information. This enables you to track certain calls or associate certain tasks with the client that started them. For example: + curl -i -H “X-Opaque-Id: 123456” “localhost:9200/_tasks?group_by=parents” + The API returns the following result: + HTTP/1.1 200 OK X-Opaque-Id: 123456 content-type: application/json; charset=UTF-8 content-length: 831 {

 "tasks" : {
   "u5lcZHqcQhu-rUoFaqDphA:45" : {
     "node" : "u5lcZHqcQhu-rUoFaqDphA",
     "id" : 45,
     "type" : "transport",
     "action" : "cluster:monitor/tasks/lists",
     "start_time_in_millis" : 1513823752749,
     "running_time_in_nanos" : 293139,
     "cancellable" : false,
     "headers" : {
       "X-Opaque-Id" : "123456"
     },
     "children" : [
       {
         "node" : "u5lcZHqcQhu-rUoFaqDphA",
         "id" : 46,
         "type" : "direct",
         "action" : "cluster:monitor/tasks/lists[n]",
         "start_time_in_millis" : 1513823752750,
         "running_time_in_nanos" : 92133,
         "cancellable" : false,
         "parent_task_id" : "u5lcZHqcQhu-rUoFaqDphA:45",
         "headers" : {
           "X-Opaque-Id" : "123456"
         }
       }
     ]
   }
 }
}

+ In this example, X-Opaque-Id: 123456 is the ID as a part of the response header. The X-Opaque-Id in the task headers is the ID for the task that was initiated by the REST request. The X-Opaque-Id in the children headers is the child task of the task that was initiated by the REST request. This functionality is Experimental and may be changed or removed completely in a future release. Elastic will take a best effort approach to fix any issues, but experimental features are not subject to the support SLA of official GA features.

Parameters:

  • arguments (Hash) (defaults to: {}) —

    a customizable set of options

Options Hash (arguments):

  • :actions (String) —

    A comma-separated list or wildcard expression of actions used to limit the request. For example, you can use cluser:* to retrieve all cluster-related tasks.

  • :detailed (Boolean) —

    If true, the response includes detailed information about the running tasks. This information is useful to distinguish tasks from each other but is more costly to run.

  • :group_by (String) —

    A key that is used to group tasks in the response. The task lists can be grouped either by nodes or by parent tasks.

  • :nodes (String, Array) —

    A comma-separated list of node IDs or names that is used to limit the returned information.

  • :parent_task_id (String) —

    A parent task identifier that is used to limit returned information. To return all tasks, omit this parameter or use a value of -1. If the parent task is not found, the API does not return a 404 response code.

  • :timeout (Time) —

    The period to wait for each node to respond. If a node does not respond before its timeout expires, the response does not include its information. However, timed out nodes are included in the node_failures property. Server default: 30s.

  • :wait_for_completion (Boolean) —

    If true, the request blocks until the operation is complete.

  • :headers (Hash) —

    Custom HTTP headers

See Also:



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# File 'lib/elasticsearch/api/actions/tasks/list.rb', line 100

def list(arguments = {})
  request_opts = { endpoint: arguments[:endpoint] || 'tasks.list' }

  arguments = arguments.clone
  headers = arguments.delete(:headers) || {}

  body = nil

  method = Elasticsearch::API::HTTP_GET
  path   = '_tasks'
  params = Utils.process_params(arguments)

  Elasticsearch::API::Response.new(
    perform_request(method, path, params, body, headers, request_opts)
  )
end