sqoop错误

String url = "http://localhost:12000/sqoop/";SqoopClient client = new SqoopClient(url);//Creating dummy job objectMJob job = client.createJob("fromLinkName", "toLinkName");job.setName("Vampire");job.setCreationUser("Buffy");// set the "FROM" link job config valuesMFromConfig fromJobConfig = job.getFromJobConfig();fromJobConfig.getStringInput("fromJobConfig.schemaName").setValue("sqoop");fromJobConfig.getStringInput("fromJobConfig.tableName").setValue("sqoop");fromJobConfig.getStringInput("fromJobConfig.partitionColumn").setValue("id");// set the "TO" link job config valuesMToConfig toJobConfig = job.getToJobConfig();toJobConfig.getStringInput("toJobConfig.outputDirectory").setValue("/usr/tmp");// set the driver config valuesMDriverConfig driverConfig = job.getDriverConfig();driverConfig.getIntegerInput("throttlingConfig.numExtractors").setValue(3);

以上是官方文档中的job创建的代码，但运行是会抛出以下错误

Error: org.apache.sqoop.common.SqoopException:MAPRED_EXEC_0018:Error occurs during loader run atorg.apache.sqoop.job.mr.SqoopOutputFormatLoadExecutor$ConsumerThread.run(SqoopOutputFormatLoadExecutor.java:292) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Thread PoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by:  org.apache.sqoop.common.SqoopException: CORE_0000:An  unknown error has occurred at  org.apache.sqoop.utils.ClassUtils.executeWithClassLoader( ClassUtils.java:286) at  org.apache.sqoop.job.mr.SqoopOutputFormatLoadExecutor$Con sumerThread.run(SqoopOutputFormatLoadExecutor.java:259)  ... 5 more Caused by: java.lang.NullPointerException at  org.apache.sqoop.connector.hdfs.HdfsLoader.getExtension(H dfsLoader.java:161) at  org.apache.sqoop.connector.hdfs.HdfsLoader.access$100(Hdf sLoader.java:45) at  org.apache.sqoop.connector.hdfs.HdfsLoader$1.run(HdfsLoad er.java:86) at  org.apache.sqoop.connector.hdfs.HdfsLoader$1.run(HdfsLoad er.java:60) at  java.security.AccessController.doPrivileged(Native  Method) at  javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(User GroupInformation.java:1698) at  org.apache.sqoop.connector.hdfs.HdfsLoader.load(HdfsLoade r.java:60) at  org.apache.sqoop.connector.hdfs.HdfsLoader.load(HdfsLoade r.java:45) at  org.apache.sqoop.job.mr.SqoopOutputFormatLoadExecutor$Con sumerThread$1.call(SqoopOutputFormatLoadExecutor.java:279) at  org.apache.sqoop.job.mr.SqoopOutputFormatLoadExecutor$Con sumerThread$1.call(SqoopOutputFormatLoadExecutor.java:260 ) at  org.apache.sqoop.utils.ClassUtils.executeWithClassLoader( ClassUtils.java:281) ... 6 more

原因是没有指定结果输出类型
应在
// set the “TO” link job config values下指定输出格式

toJobConfig.getInput("toJobConfig.outputFormat").setValue("TEXT_FILE");