Topics What Tools are Available for Troubleshooting p 352 Viewing and

Topics what tools are available for troubleshooting p

This preview shows page 358 - 360 out of 395 pages.

Topics What Tools are Available for Troubleshooting? (p. 352) Viewing and Restarting Amazon EMR and Application Processes (Daemons) (p. 353) Troubleshoot a Failed Cluster (p. 355) Troubleshoot a Slow Cluster (p. 358) Common Errors in Amazon EMR (p. 364) Troubleshoot a Lake Formation Cluster (Beta) (p. 380) When you are developing a new Hadoop application, we recommend that you enable debugging and process a small but representative subset of your data to test the application. You may also want to run the application step-by-step to test each step separately. For more information, see Configure Cluster Logging and Debugging (p. 136) and Step 5: Test the Cluster Step by Step (p. 358) . What Tools are Available for Troubleshooting? There are several tools you can use to gather information about your cluster to help determine what went wrong. Some require that you initialize them when you launch the cluster; others are available for every cluster. Topics Tools to Display Cluster Details (p. 352) Tools to View Log Files (p. 353) Tools to Monitor Cluster Performance (p. 353) Tools to Display Cluster Details You can use the AWS Management Console, AWS CLI, or EMR API to retrieve detailed information about an EMR cluster and job execution. For more information about using the AWS Management Console and AWS CLI, see View Cluster Status and Details (p. 273) . Amazon EMR Console Details Pane In the Clusters list on the Amazon EMR console you can see high-level information about the status of each cluster in your account and region. The list displays all clusters that you have launched in the past two months, regardless of whether they are active or terminated. From the Clusters list, you can select a cluster Name to view cluster details. This information is organized in different categories to make it easy to navigate. The Application history available in the cluster details page can be particularly useful for troubleshooting. It provides status of YARN applications, and for some, such as Spark applications you can drill into different metrics and facets, such as jobs, stages, and executors. For more information, see View Application History (p. 280) . This feature is available only in Amazon EMR version 5.8.0 and later. 352
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Amazon EMR Management Guide Tools to View Log Files Amazon EMR Command Line Interface You can locate details about a cluster from the CLI using the --describe argument. Amazon EMR API You can locate details about a cluster from the API using the DescribeJobFlows action. Tools to View Log Files Amazon EMR and Hadoop both generate log files as the cluster runs. You can access these log files from several different tools, depending on the configuration you specified when you launched the cluster. For more information, see Configure Cluster Logging and Debugging (p. 136) .
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  • Spring '12
  • LauraParker
  • Amazon Web Services, Amazon Elastic Compute Cloud

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