sqoop1.99.7 mysql->hdfs job执行报错

sqoop2.0版本，mysql到hdfs抽取数据执行job时报错，由于网上sqoop2的相关资料实在太少，这个问题困扰了我好久，所以贴出来给大家一起避坑

报错如下：

java.lang.NoClassDefFoundError: org/apache/commons/lang/StringUtils

	at org.apache.sqoop.job.mr.MRUtils.initConnectorClassLoaders(MRUtils.java:51)

	at org.apache.sqoop.job.mr.SqoopNullOutputFormat$SqoopDestroyerOutputCommitter.setupJob(SqoopNullOutputFormat.java:64)

	at org.apache.hadoop.mapreduce.v2.app.commit.CommitterEventHandler$EventProcessor.handleJobSetup(CommitterEventHandler.java:255)

	at org.apache.hadoop.mapreduce.v2.app.commit.CommitterEventHandler$EventProcessor.run(CommitterEventHandler.java:235)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

	at java.lang.Thread.run(Thread.java:748)

Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.StringUtils

	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)

	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)

	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)

	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)

	... 7 more

2021-04-06 12:16:15,551 FATAL [CommitterEvent Processor #0] org.apache.hadoop.yarn.YarnUncaughtExceptionHandler: Thread Thread[CommitterEvent Processor #0,5,main] threw an Error.  Shutting down now...

java.lang.NoClassDefFoundError: org/apache/commons/lang/StringUtils

	at org.apache.sqoop.job.mr.MRUtils.initConnectorClassLoaders(MRUtils.java:51)

	at org.apache.sqoop.job.mr.SqoopNullOutputFormat$SqoopDestroyerOutputCommitter.setupJob(SqoopNullOutputFormat.java:64)

	at org.apache.hadoop.mapreduce.v2.app.commit.CommitterEventHandler$EventProcessor.handleJobSetup(CommitterEventHandler.java:255)

	at org.apache.hadoop.mapreduce.v2.app.commit.CommitterEventHandler$EventProcessor.run(CommitterEventHandler.java:235)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

	at java.lang.Thread.run(Thread.java:748)

Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.StringUtils

	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)

	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)

	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)

	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)

	... 7 more

解决方法：
将sqoop安装目录下的commons-lang-2.5.jar这个包（server shell tools这三个文件夹下的lib包里都有，随便找一个就行）拷贝到hadoop安装目录下的/share/hadoop/common/lib里面就解决了