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. For relocatable tasks, this API transparently follows the task across graceful shutdown relocations, so callers can keep using the original task ID. The returned task reports its original_task_id and original_start_time_in_millis if it is continuing work from an earlier task. This functionality is experimental and is not ready for production usage. Experimental features may change or be removed at any time. Elastic will work to fix any issues, but experimental features are not subject to the support SLA of official GA features. Specific Support terms apply.

Parameters:

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

    a customizable set of options

Options Hash (arguments):

  • :task_id (String) —

    The task identifier.

  • :actions (String, Array<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.

  • :error_trace (Boolean) —

    When set to true Elasticsearch will include the full stack trace of errors when they occur.

  • :filter_path (String, Array<String>) —

    Comma-separated list of filters in dot notation which reduce the response returned by Elasticsearch.

  • :human (Boolean) —

    When set to true will return statistics in a format suitable for humans. For example "exists_time": "1h" for humans and "exists_time_in_millis": 3600000 for computers. When disabled the human readable values will be omitted. This makes sense for responses being consumed only by machines.

  • :pretty (Boolean) —

    If set to true the returned JSON will be "pretty-formatted". Only use this option for debugging only.

  • :headers (Hash) —

    Custom HTTP headers

See Also:



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# File 'lib/elasticsearch/api/actions/tasks/cancel.rb', line 62

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. For relocatable tasks, this API transparently follows the task across graceful shutdown relocations, so callers can keep using the original task ID. The returned task reports its original_task_id and original_start_time_in_millis if it is continuing work from an earlier task. This functionality is experimental and is not ready for production usage. Experimental features may change or be removed at any time. Elastic will work to fix any issues, but experimental features are not subject to the support SLA of official GA features. Specific Support terms apply.

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.

  • :follow_relocations (Boolean) —

    Internal use only Server default: true.

  • :error_trace (Boolean) —

    When set to true Elasticsearch will include the full stack trace of errors when they occur.

  • :filter_path (String, Array<String>) —

    Comma-separated list of filters in dot notation which reduce the response returned by Elasticsearch.

  • :human (Boolean) —

    When set to true will return statistics in a format suitable for humans. For example "exists_time": "1h" for humans and "exists_time_in_millis": 3600000 for computers. When disabled the human readable values will be omitted. This makes sense for responses being consumed only by machines.

  • :pretty (Boolean) —

    If set to true the returned JSON will be "pretty-formatted". Only use this option for debugging only.

  • :headers (Hash) —

    Custom HTTP headers

Raises:

  • (ArgumentError)

See Also:



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# File 'lib/elasticsearch/api/actions/tasks/get.rb', line 58

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. For relocatable tasks, this API transparently follows the task across graceful shutdown relocations, so callers can keep using the original task ID. The returned task reports its original_task_id and original_start_time_in_millis if it is continuing work from an earlier task. 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" "http://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 is not ready for production usage. Experimental features may change or be removed at any time. Elastic will work to fix any issues, but experimental features are not subject to the support SLA of official GA features. Specific Support terms apply.

Parameters:

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

    a customizable set of options

Options Hash (arguments):

  • :actions (String, Array<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. Server default: nodes.

  • :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.

  • :error_trace (Boolean) —

    When set to true Elasticsearch will include the full stack trace of errors when they occur.

  • :filter_path (String, Array<String>) —

    Comma-separated list of filters in dot notation which reduce the response returned by Elasticsearch.

  • :human (Boolean) —

    When set to true will return statistics in a format suitable for humans. For example "exists_time": "1h" for humans and "exists_time_in_millis": 3600000 for computers. When disabled the human readable values will be omitted. This makes sense for responses being consumed only by machines.

  • :pretty (Boolean) —

    If set to true the returned JSON will be "pretty-formatted". Only use this option for debugging only.

  • :headers (Hash) —

    Custom HTTP headers

See Also:



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# File 'lib/elasticsearch/api/actions/tasks/list.rb', line 118

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