[ aws . emr ]

describe-step

Description

Provides more detail about the cluster step.

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.

Synopsis

  describe-step
--cluster-id <value>
--step-id <value>
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]

Options

--cluster-id (string)

The identifier of the cluster with steps to describe.

--step-id (string)

The identifier of the step to describe.

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See ‘aws help’ for descriptions of global parameters.

Examples

The following command describes a step with the step ID s-3LZC0QUT43AM in a cluster with the cluster ID j-3SD91U2E1L2QX:

aws emr describe-step --cluster-id j-3SD91U2E1L2QX --step-id s-3LZC0QUT43AM

Output:

{
    "Step": {
        "Status": {
            "Timeline": {
                "EndDateTime": 1433200470.481,
                "CreationDateTime": 1433199926.597,
                "StartDateTime": 1433200404.959
            },
            "State": "COMPLETED",
            "StateChangeReason": {}
        },
        "Config": {
            "Args": [
                "s3://us-west-2.elasticmapreduce/libs/hive/hive-script",
                "--base-path",
                "s3://us-west-2.elasticmapreduce/libs/hive/",
                "--install-hive",
                "--hive-versions",
                "0.13.1"
            ],
            "Jar": "s3://us-west-2.elasticmapreduce/libs/script-runner/script-runner.jar",
            "Properties": {}
        },
        "Id": "s-3LZC0QUT43AM",
        "ActionOnFailure": "TERMINATE_CLUSTER",
        "Name": "Setup hive"
    }
}

Output

Step -> (structure)

The step details for the requested step identifier.

Id -> (string)

The identifier of the cluster step.

Name -> (string)

The name of the cluster step.

Config -> (structure)

The Hadoop job configuration of the cluster step.

Jar -> (string)

The path to the JAR file that runs during the step.

Properties -> (map)

The list of Java properties that are set when the step runs. You can use these properties to pass key-value pairs to your main function.

key -> (string)

value -> (string)

MainClass -> (string)

The name of the main class in the specified Java file. If not specified, the JAR file should specify a main class in its manifest file.

Args -> (list)

The list of command line arguments to pass to the JAR file’s main function for execution.

(string)

ActionOnFailure -> (string)

The action to take when the cluster step fails. Possible values are TERMINATE_CLUSTER, CANCEL_AND_WAIT, and CONTINUE. TERMINATE_JOB_FLOW is provided for backward compatibility. We recommend using TERMINATE_CLUSTER instead.

Status -> (structure)

The current execution status details of the cluster step.

State -> (string)

The execution state of the cluster step.

StateChangeReason -> (structure)

The reason for the step execution status change.

Code -> (string)

The programmable code for the state change reason. Note: Currently, the service provides no code for the state change.

Message -> (string)

The descriptive message for the state change reason.

FailureDetails -> (structure)

The details for the step failure including reason, message, and log file path where the root cause was identified.

Reason -> (string)

The reason for the step failure. In the case where the service cannot successfully determine the root cause of the failure, it returns “Unknown Error” as a reason.

Message -> (string)

The descriptive message including the error the Amazon EMR service has identified as the cause of step failure. This is text from an error log that describes the root cause of the failure.

LogFile -> (string)

The path to the log file where the step failure root cause was originally recorded.

Timeline -> (structure)

The timeline of the cluster step status over time.

CreationDateTime -> (timestamp)

The date and time when the cluster step was created.

StartDateTime -> (timestamp)

The date and time when the cluster step execution started.

EndDateTime -> (timestamp)

The date and time when the cluster step execution completed or failed.