sqoop hive mysql报错

若无法使用hive连接mysql
则可能是版本不一致
可使用Hive自带schematool工具。Hive现在包含一个用于 Hive Metastore 架构操控的脱机工具，名为 schematool.此工具可用于初始化当前 Hive 版本的 Metastore 架构。此外，其还可处理从较旧版本到新版本的架构升级。

schematool -dbType mysql -initSchema

在用sqoop将Hive表导入到MySQL时报错

cd /usr/local/sqoop
./bin/sqoop export --connect jdbc:mysql://localhost:3306/dblab --username root --password hadoop --table user_action --export-dir '/user/hive/warehouse/dblab.db/user_action' --fields-terminated-by '\t';

java.lang.Exception: java.io.IOException: java.lang.ClassNotFoundException: user_action
at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:489)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:549)
Caused by: java.io.IOException: java.lang.ClassNotFoundException: new_users_counts
at org.apache.sqoop.mapreduce.TextExportMapper.setup(TextExportMapper.java:70)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:143)
at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:270)
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(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: new_users_counts
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.apache.sqoop.mapreduce.TextExportMapper.setup(TextExportMapper.java:66)
... 10 more

将/tmp/sqoop-hadoop/compile寻找下你传入表的表名的 jar文件（如user_action.jar),放入sqoop的lib下即可