Sqoop2 API使用详解

Sqoop2服务端版本 1.99.5
下载地址：http://archive.apache.org/dist/sqoop/

maven 依赖

<dependency>
    <groupId>org.apache.sqoopgroupId>
    <artifactId>sqoop-clientartifactId>
    <version>1.99.4version>
dependency>

初始化

String url = "http://ip:12000/sqoop/";
SqoopClient client = new SqoopClient(url);

//可以使用客户端对象的setServerUrl（String）方法来修改服务器的URL
client.setServerUrl(newUrl);

创建JDBC Link

创建Link之前首先要了解你需要创建一个什么类型的Link，你的Sqoop2的版本支持什么样的连接器;
ps:通过sqoop的shell命令可以查看到当前版本支持什么类型的连接器以及连接器id对应name（命令：show connector）

public static void saveJdbcLink(SqoopClient client) {
    //创建一个源链接 JDBC
    //1表示jdbc连接的id,各个版本不同操作方式不同
    //如有的版本直接使用连接器名称创建Link，
    //如：MLink link = client.createLink("generic-jdbc-connector");
    long connectorId = 1;
    MLink fromLink = client.createLink(connectorId);
    fromLink.setName("jdbcLink");
    fromLink.setCreationUser("Buffy");
    MLinkConfig linkConfig = fromLink.getConnectorLinkConfig();
    // 填入连接配置的值
    linkConfig.getStringInput("linkConfig.connectionString").setValue("jdbc:mysql://ip:3306/dataswitch");
    linkConfig.getStringInput("linkConfig.jdbcDriver").setValue("com.mysql.jdbc.Driver");
    linkConfig.getStringInput("linkConfig.username").setValue("username");
    linkConfig.getStringInput("linkConfig.password").setValue("pw");

    // 保存填充过的连接对象
    Status status = client.saveLink(fromLink);
    if (status.canProceed()) {
        System.out.println("Created Link with Link Name : " + fromLink.getName() + "-id : " + fromLink.getPersistenceId());
    } else {
        System.out.println("Something went wrong creating the link");
    }
}

创建HDFS Link

public static void saveHdfsLink(SqoopClient client) {
    //创建一个目的地链接HDFS
    //3表示hdfs连接的id,各个版本不同操作方式不同
    //如有的版本直接使用连接器名称创建Link，
    //如：MLink link = client.createLink("hdfs-connector");
    long toCconnectorId_h = 3;
    MLink toLink = client.createLink(toCconnectorId_h);
    toLink.setName("hdfsLink");
    toLink.setCreationUser("Buffy");
    MLinkConfig toLinkConfig = toLink.getConnectorLinkConfig();
    toLinkConfig.getStringInput("linkConfig.uri").setValue("hdfs://http://ip:8020");  
    // 保存填充过的连接对象
    Status status = client.saveLink(toLink);
    if (status.canProceed()) {
        System.out.println("Created Link with Link Name : " + toLink.getName() + "-id : " + toLink.getPersistenceId());
    } else {
        System.out.println("Something went wrong creating the link");
    }
}

创建作业

public static void saveCondiJob(SqoopClient client) {
    //为创建Link时返回的id -- toLink.getPersistenceId()
    long fromLinkId = 29;// for jdbc connector
    long toLinkId = 30; // for jdbc  connector

    MJob job = client.createJob(fromLinkId, toLinkId);
    job.setName("jobCondii");
    job.setCreationUser("jobCondia");
    // set the "FROM" link job config values
    MFromConfig fromJobConfig = job.getFromJobConfig();
    //fromJobConfig.getStringInput("fromJobConfig.schemaName").setValue("dataswitch");
    //以下按指定条件查询${CONDITIONS}为必须，代码会解析sql是否包含子字符串，如果指定sql上一行代码不需指定会报错
    fromJobConfig.getStringInput("fromJobConfig.sql").setValue("SELECT id,name,dept FROM dataswitch.zcstest where ${CONDITIONS} and name like \'%狗%\' ");
    fromJobConfig.getStringInput("fromJobConfig.partitionColumn").setValue("id");//分区字段

    // set the "TO" link job config values
    MToConfig toJobConfig = job.getToJobConfig();
    toJobConfig.getStringInput("toJobConfig.outputDirectory").setValue("/usr/tmp");//指定hdfs路径
    // set the driver config values
    MDriverConfig driverConfig = job.getDriverConfig();
    driverConfig.getIntegerInput("throttlingConfig.numExtractors").setValue(2); //指定运行MR程序map个数   
    driverConfig.getIntegerInput("throttlingConfig.numLoaders").setValue(1);    //指定运行MR程序reduce个数    
    Status status = client.saveJob(job);
    List configs = job.getFromJobConfig().getConfigs();
    printMessage(configs);
    if (status.canProceed()) {
        System.out.println("Created Job with Job Id: " + job.getPersistenceId());
    } else {
        System.out.println("Something went wrong creating the job");
    }
}

启动作业

public static void startJob(SqoopClient client) {
    //为创建作业时返回的id -- job.getPersistenceId()
    long jobId = 30;
    MSubmission submission = client.startJob(jobId);
    System.out.println("Job Submission Status : " + submission.getStatus());
    if(submission.getStatus().isRunning() && submission.getProgress() != -1) {
      System.out.println("Progress : " + String.format("%.2f %%", submission.getProgress() * 100));
    }
    System.out.println("Hadoop job id :" + submission.getExternalId());
    System.out.println("Job link : " + submission.getExternalLink());
    Counters counters = submission.getCounters();
    if(counters != null) {
      System.out.println("Counters:");
      for(CounterGroup group : counters) {
        System.out.print("\t");
        System.out.println(group.getName());
        for(Counter counter : group) {
          System.out.print("\t\t");
          System.out.print(counter.getName());
          System.out.print(": ");
          System.out.println(counter.getValue());
        }
      }
    }
    if(submission.getExceptionInfo() != null) {
      System.out.println("Exception info : " +submission.getExceptionInfo());
    }
}