Skip to content

Latest commit

 

History

History
145 lines (111 loc) · 6.91 KB

apache-hadoop-use-hive-dotnet-sdk.md

File metadata and controls

145 lines (111 loc) · 6.91 KB
title description ms.reviewer services author ms.service ms.custom ms.topic ms.date ms.author
Run Apache Hive queries using HDInsight .NET SDK - Azure
Learn how to submit Apache Hadoop jobs to Azure HDInsight Apache Hadoop using HDInsight .NET SDK.
jasonh
hdinsight
hrasheed-msft
hdinsight
hdinsightactive
conceptual
05/16/2018
hrasheed

Run Apache Hive queries using HDInsight .NET SDK

[!INCLUDE hive-selector]

Learn how to submit Apache Hive queries using HDInsight .NET SDK. You write a C# program to submit a Hive query for listing Hive tables, and display the results.

Note

The steps in this article must be performed from a Windows client. For information on using a Linux, OS X, or Unix client to work with Hive, use the tab selector shown on the top of the article.

Prerequisites

Before you begin this article, you must have the following items:

  • An Apache Hadoop cluster in HDInsight. See Get started using Linux-based Hadoop in HDInsight.

    [!WARNING] As of September 15, 2017, the HDInsight .NET SDK only supports returning Hive query results from Azure Storage accounts. If you use this example with an HDInsight cluster that uses Azure Data Lake Store as primary storage, you cannot retrieve search results using the .NET SDK.

  • Visual Studio 2013/2015/2017.

Run a Hive Query

The HDInsight .NET SDK provides .NET client libraries, which makes it easier to work with HDInsight clusters from .NET.

To Submit jobs

  1. Create a C# console application in Visual Studio.

  2. From the Nuget Package Manager Console, run the following command:

     Install-Package Microsoft.Azure.Management.HDInsight.Job

  3. Use the following code:

        using System.Collections.Generic;
    using System.IO;
    using System.Text;
    using System.Threading;
    using Microsoft.Azure.Management.HDInsight.Job;
    using Microsoft.Azure.Management.HDInsight.Job.Models;
    using Hyak.Common;

    namespace SubmitHDInsightJobDotNet
    {
        class Program
        {
            private static HDInsightJobManagementClient _hdiJobManagementClient;

            private const string ExistingClusterName = "<Your HDInsight Cluster Name>";
            private const string ExistingClusterUri = ExistingClusterName + ".azurehdinsight.net";
            private const string ExistingClusterUsername = "<Cluster Username>";
            private const string ExistingClusterPassword = "<Cluster User Password>";
            
            // Only Azure Storage accounts are supported by the SDK
            private const string DefaultStorageAccountName = "<Default Storage Account Name>";
            private const string DefaultStorageAccountKey = "<Default Storage Account Key>";
            private const string DefaultStorageContainerName = "<Default Blob Container Name>";

            static void Main(string[] args)
            {
                System.Console.WriteLine("The application is running ...");

                var clusterCredentials = new BasicAuthenticationCloudCredentials { Username = ExistingClusterUsername, Password = ExistingClusterPassword };
                _hdiJobManagementClient = new HDInsightJobManagementClient(ExistingClusterUri, clusterCredentials);

                SubmitHiveJob();

                System.Console.WriteLine("Press ENTER to continue ...");
                System.Console.ReadLine();
            }

            private static void SubmitHiveJob()
            {
                Dictionary<string, string> defines = new Dictionary<string, string> { { "hive.execution.engine", "tez" }, { "hive.exec.reducers.max", "1" } };
                List<string> args = new List<string> { { "argA" }, { "argB" } };
                var parameters = new HiveJobSubmissionParameters
                {
                    Query = "SHOW TABLES",
                    Defines = defines,
                    Arguments = args
                };

                System.Console.WriteLine("Submitting the Hive job to the cluster...");
                var jobResponse = _hdiJobManagementClient.JobManagement.SubmitHiveJob(parameters);
                var jobId = jobResponse.JobSubmissionJsonResponse.Id;
                System.Console.WriteLine("Response status code is " + jobResponse.StatusCode);
                System.Console.WriteLine("JobId is " + jobId);

                System.Console.WriteLine("Waiting for the job completion ...");

                // Wait for job completion
                var jobDetail = _hdiJobManagementClient.JobManagement.GetJob(jobId).JobDetail;
                while (!jobDetail.Status.JobComplete)
                {
                    Thread.Sleep(1000);
                    jobDetail = _hdiJobManagementClient.JobManagement.GetJob(jobId).JobDetail;
                }

                // Get job output
                var storageAccess = new AzureStorageAccess(DefaultStorageAccountName, DefaultStorageAccountKey,
                    DefaultStorageContainerName);
                var output = (jobDetail.ExitValue == 0)
                    ? _hdiJobManagementClient.JobManagement.GetJobOutput(jobId, storageAccess) // fetch stdout output in case of success
                    : _hdiJobManagementClient.JobManagement.GetJobErrorLogs(jobId, storageAccess); // fetch stderr output in case of failure

                System.Console.WriteLine("Job output is: ");

                using (var reader = new StreamReader(output, Encoding.UTF8))
                {
                    string value = reader.ReadToEnd();
                    System.Console.WriteLine(value);
                }
            }
        }
    }

  4. Press F5 to run the application.

The output of the application shall be similar to:

HDInsight Hadoop Hive job output

Next steps

In this article, you have learned several ways to create an HDInsight cluster. To learn more, see the following articles: