提交 hadoop fs 作业

将 Hadoop FS 作业提交到 Dataproc 集群。

代码示例

Java

在尝试此示例之前，请按照《Dataproc 快速入门：使用客户端库》中的 Java 设置说明进行操作。 有关详情，请参阅 Dataproc Java API 参考文档。

要向 Dataproc 进行身份验证，请设置应用默认凭据。 如需了解详情，请参阅为本地开发环境设置身份验证。

import com.google.api.gax.longrunning.OperationFuture;
import com.google.cloud.dataproc.v1.HadoopJob;
import com.google.cloud.dataproc.v1.Job;
import com.google.cloud.dataproc.v1.JobControllerClient;
import com.google.cloud.dataproc.v1.JobControllerSettings;
import com.google.cloud.dataproc.v1.JobMetadata;
import com.google.cloud.dataproc.v1.JobPlacement;
import com.google.cloud.storage.Blob;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.concurrent.ExecutionException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SubmitHadoopFsJob {

  public static ArrayList<String> stringToList(String s) {
    return new ArrayList<>(Arrays.asList(s.split(" ")));
  }

  public static void submitHadoopFsJob() throws IOException, InterruptedException {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String region = "your-project-region";
    String clusterName = "your-cluster-name";
    String hadoopFsQuery = "your-hadoop-fs-query";
    submitHadoopFsJob(projectId, region, clusterName, hadoopFsQuery);
  }

  public static void submitHadoopFsJob(
      String projectId, String region, String clusterName, String hadoopFsQuery)
      throws IOException, InterruptedException {
    String myEndpoint = String.format("%s-dataproc.googleapis.com:443", region);

    // Configure the settings for the job controller client.
    JobControllerSettings jobControllerSettings =
        JobControllerSettings.newBuilder().setEndpoint(myEndpoint).build();

    // Create a job controller client with the configured settings. Using a try-with-resources
    // closes the client,
    // but this can also be done manually with the .close() method.
    try (JobControllerClient jobControllerClient =
        JobControllerClient.create(jobControllerSettings)) {

      // Configure cluster placement for the job.
      JobPlacement jobPlacement = JobPlacement.newBuilder().setClusterName(clusterName).build();

      // Configure Hadoop job settings. The HadoopFS query is set here.
      HadoopJob hadoopJob =
          HadoopJob.newBuilder()
              .setMainClass("org.apache.hadoop.fs.FsShell")
              .addAllArgs(stringToList(hadoopFsQuery))
              .build();

      Job job = Job.newBuilder().setPlacement(jobPlacement).setHadoopJob(hadoopJob).build();

      // Submit an asynchronous request to execute the job.
      OperationFuture<Job, JobMetadata> submitJobAsOperationAsyncRequest =
          jobControllerClient.submitJobAsOperationAsync(projectId, region, job);

      Job response = submitJobAsOperationAsyncRequest.get();

      // Print output from Google Cloud Storage.
      Matcher matches =
          Pattern.compile("gs://(.*?)/(.*)").matcher(response.getDriverOutputResourceUri());
      matches.matches();

      Storage storage = StorageOptions.getDefaultInstance().getService();
      Blob blob = storage.get(matches.group(1), String.format("%s.000000000", matches.group(2)));

      System.out.println(
          String.format("Job finished successfully: %s", new String(blob.getContent())));

    } catch (ExecutionException e) {
      // If the job does not complete successfully, print the error message.
      System.err.println(String.format("submitHadoopFSJob: %s ", e.getMessage()));
    }
  }
}

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅 Google Cloud 示例浏览器。