Emr step arguments

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Emr step arguments

The instance fleet configuration is available only in Amazon EMR versions 4. The target capacity of On-Demand units for the instance fleet, which determines how many On-Demand instances to provision. Each instance configuration has a specified WeightedCapacity.

When an On-Demand instance is provisioned, the WeightedCapacity units count toward the target capacity. Amazon EMR provisions instances until the target capacity is totally fulfilled, even if this results in an overage.

For example, if there are 2 units remaining to fulfill capacity, and Amazon EMR can only provision an instance with a WeightedCapacity of 5 units, the instance is provisioned, and the target capacity is exceeded by 3 units.

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If not specified or set to 0, only Spot instances are provisioned for the instance fleet using TargetSpotCapacity. The target capacity of Spot units for the instance fleet, which determines how many Spot instances to provision. When a Spot instance is provisioned, the WeightedCapacity units count toward the target capacity.

If not specified or set to 0, only On-Demand instances are provisioned for the instance fleet. An instance type configuration for each instance type in an instance fleet, which determines the EC2 instances Amazon EMR attempts to provision to fulfill On-Demand and Spot target capacities. There can be a maximum of 5 instance type configurations in a fleet. An EC2 instance type, such as m3. The number of units that a provisioned instance of this type provides toward fulfilling the target capacities defined in InstanceFleetConfig.

This value is 1 for a master instance fleet, and must be 1 or greater for core and task instance fleets. Defaults to 1 if not specified. Expressed in USD. Configuration of requested EBS block device associated with the instance group with count of volumes that will be associated to every instance.

The volume size, in gibibytes GiB.

AWS EMR - Submitting Spark Jobs

This can be a number from 1 - If the volume type is EBS-optimized, the minimum value is Number of EBS volumes with a specific volume configuration that will be associated with every instance in the instance group. A configuration classification that applies when provisioning cluster instances, which can include configurations for applications and software that run on the cluster. An optional configuration specification to be used when provisioning cluster instances, which can include configurations for applications and software bundled with Amazon EMR.

A configuration consists of a classification, properties, and optional nested configurations. A classification refers to an application-specific configuration file. Properties are the settings you want to change in that file. For more information, see Configuring Applications. The launch specification for Spot instances in the fleet, which determines the defined duration and provisioning timeout behavior. The spot provisioning timeout period in minutes.

If Spot instances are not provisioned within this time period, the TimeOutAction is taken. Minimum value is 5 and maximum value is The timeout applies only during initial provisioning, when the cluster is first created. The action to take when TargetSpotCapacity has not been fulfilled when the TimeoutDurationMinutes has expired; that is, when all Spot instances could not be provisioned within the Spot provisioning timeout.

The defined duration for Spot instances also known as Spot blocks in minutes. When specified, the Spot instance does not terminate before the defined duration expires, and defined duration pricing for Spot instances applies. Valid values are 60, or The duration period starts as soon as a Spot instance receives its instance ID.

At the end of the duration, Amazon EC2 marks the Spot instance for termination and provides a Spot instance termination notice, which gives the instance a two-minute warning before it terminates.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I'm calling this method from the Python boto2 library :. I know that arguments after mapper have default values so I don't have to specify their values. But what if I want to pass a value for just one argument at the very end?

For example, I want to provide values for the namemapperand combiner parameters, and just use the default value for reducer.

If there are arguments, and I just want to pass a value for the very last argument, then I have to pass many default values to it.

Is there a easier way to do this? Note, because name and mapper were in order, specifying the argument name wasn't required. Just pass the arguments you want by keyword: boto. Learn more. How to skip providing default arguments in a Python method Ask Question. Asked 6 years, 2 months ago. Active 2 years, 6 months ago. Viewed 12k times. I'm calling this method from the Python boto2 library : boto. Should I do this: boto.

StreamingStep 'a name', 'mapper name', None, 'combiner name' Or should I expressly pass all arguments before it? Suanmeiguo Suanmeiguo 2 2 gold badges 10 10 silver badges 23 23 bronze badges. Active Oldest Votes. There are two ways to do it. The first, most straightforward, is to pass a named argument: boto. BrenBarn BrenBarn k 25 25 gold badges silver badges bronze badges.

Do not use positional arguments,instead use keyword arguments.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

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AWS Stepfunctions recently added EMR integration, which is cool, but i couldn't find a way to pass a variable from step functions into the addstep args. Similar to "ClusterId. ClusterId" this cluster id variable works.

Parameters allow you to define key-value pairs, so as the value for the "Args" key is an array, you won't be able to dynamically reference a specific element in the array, you would need to reference the whole array instead. For example "Args. So for your use-case the best way to achieve this would be to add a pre-processing state, before calling this state. Learn more. Asked 3 months ago. Active 3 months ago. Viewed times. Philly guy Philly guy 1 1 silver badge 5 5 bronze badges.

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emr step arguments

Related 1.This Product. Configure spark-submit parameters. The job in the preceding figure uses the official Spark example package. Therefore, you do not need to upload your own JAR package.

Work with Steps Using the AWS CLI and Console

Theoretically, you only need to make sure that the total amount of resources calculated by using the preceding formula does not exceed the total amount of the resources of the cluster.

However, in production scenarios, the operating system, HDFS file systems, and E-MapReduce services may also need to use core and memory resources. If no core and memory resources are available for them, then the job performance declines or the job fails. Typically, the executor-cores parameter is set to the same value as the number of cluster cores.

If the value is too large, the CPU switches frequently without benefiting the performance as expected. If you set the memory to a very large value, you should pay close attention to the overhead caused by garbage collection.

Typically, we recommend that you assign memory less than or equal to 64 GB to an executor. For example, if you have 10 ECS instances, you can set num-executors to 10, and set the appropriate memory and number of concurrent jobs. If the code that you use in the job is not thread-safe, you need to monitor whether the concurrency causes job errors when you set the executor-cores parameter.

If yes, we recommend that you set executor-cores to 1. All Products.

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This topic describes how to configure spark-submit parameters in E-MapReduce. Notice Only CPU and memory resources are calculated when a job is submitted. Therefore, the disk size is not included in total resource calculation. After you create a cluster, you can submit jobs. First, you need to create a job in E-MapReduce. The following figure shows the job parameters. The parameters are listed as follows: --class org. As specified by the --driver-memory parameter, 4 GB memory is allocated to the main program based on the job settings.

The main program may not use all of the allocated memory.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. Few options we have to overcome this is.

emr step arguments

Rather than reinventing the wheel, if any other option which is directly available from EMR or AWS which fulfil our requirement, then our efforts would be reduced. For running the shell script via steps we can still use command-runner. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 4 years, 1 month ago.

Active 1 year ago. Viewed 5k times. Few options we have to overcome this is, We can write the shell script logic in java program and add custom jar step. Bootstrap action. But as our requirement is to execute the shell script after the step 1 is complete, I am not sure whether it will be useful. Free Coder Free Coder 41 1 1 silver badge 4 4 bronze badges. Active Oldest Votes. Kiran Thati Kiran Thati 41 2 2 bronze badges.

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emr step arguments

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Feedback on Q2 Community Roadmap. Related 2. Hot Network Questions. Question feed. Server Fault works best with JavaScript enabled.Did you find this page useful? Do you have a suggestion? Give us feedback or send us a pull request on GitHub. See the User Guide for help getting started. See 'aws help' for descriptions of global parameters. The JSON string follows the format provided by --generate-cli-skeleton. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

If provided with no value or the value inputprints a sample input JSON that can be used as an argument for --cli-input-json.

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If provided with the value outputit validates the command inputs and returns a sample output JSON for that command. 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. The details for the step failure including reason, message, and log file path where the root cause was identified.

Feedback Did you find this page useful? The Hadoop job configuration of the cluster step. 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. The list of command line arguments to pass to the JAR file's main function for execution.

The action to take when the cluster step fails.

Adding a Spark Step

The current execution status details of the cluster step. The reason for the step execution status change. Note: Currently, the service provides no code for the state change. In the case where the service cannot successfully determine the root cause of the failure, it returns "Unknown Error" as a reason.

The descriptive message including the error the 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. The timeline of the cluster step status over time.A few weeks ago I had to recompute some counters and statistics on most of our database, which represents several hundred of gigabytes.

It was the time for us to overcome long-running scripts and to dig a bit further into more efficient solutions. Amazon EMR provides a managed platform that makes it easy, fast, and cost-effective to process large-scale data across dynamically scalable Amazon EC2 instances, on which you can run several popular distributed frameworks such as Apache Spark.

But after a mighty struggle, I finally figured out.

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Read on to learn how we managed to get Spark doing great things on our dataset. Our infrastructure is currently hosted on AWS.

We use the Simple Queue Service SQS to enqueue and process incoming events thanks to home-made digesters that run on an auto-scalable cluster. Our first data flow design. More computation-heavy tasks run every few minutes or so, using a crontab. This is a fast-to-implement solution that works quite well, but it has several flaws:. I already used Spark a bit, some time ago in a different company, and I was a bit tired of writing quick and dirty python scripts; I was looking for a more robust and scalable solution.

In my previous experience, we had almost two people working full-time for a few months just to make sure that everything was working properly and efficiently. Amazon EMR was what I was looking for! Even if according to AWS EMR docs it is supposed to be easy as hell to set up and use, digging into some concepts of the AWS platform to understand what I was doing was a bit time-consuming.

According to many sources, using S3 as the central data exchange platform with the Spark cluster is the easiest and the more efficient way.

Since it is completely integrated and there is nothing more to do, it will do just fine for now. There are at least two ways to do so.

The AWS interface available here and the awscli command line tool available here. Creating a new cluster via the user interface is quite straightforward. Just click on the Create cluster button and fill the following form.


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