我安装了sqoop 1.4.6，并尝试使用以下命令将一些数据从MySQL5.6.29导入hadoop版本2.7.2： sqoop import --connect jdbc:mysql://<server_name>:3306/<dbname> --username <user-name> --password <password> --m 1 --table <table-name> --target-dir <hadoop-target-folder> 然后，我得到以下错误：
java.lang.Exception: java.lang.RuntimeException:
java.lang.ClassNotFoundException: Class <ClassName> not found
at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:522)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class <ClassName> not found
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2195)
at org.apache.sqoop.mapreduce.db.DBConfiguration.getInputClass(DBConfiguration.java:403)
at org.apache.sqoop.mapreduce.db.DataDrivenDBInputFormat.createDBRecordReader(DataDrivenDBInputFormat.java:237)
at org.apache.sqoop.mapreduce.db.DBInputFormat.createRecordReader(DBInputFormat.java:263)
at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.<init>(MapTask.java:515)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:758)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:243)
at java.util.concurrent.Executors$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: Class <ClassName> not found
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2101)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2193)
... 12 more可能有一个类似的问题，但我没有找到答案。。。
有什么想法吗？谢谢
2条答案
按热度按时间mmvthczy1#
生成jar：
scoop codegen --connect "jdbc:mysql://example.com/sqoop" --username sqoop --password sqoop --table tbl在输出中查找行：writing jar file:在导入命令中使用上述jar：
k5hmc34c2#
根本原因是，当使用localjobrunner执行导入作业时，它无法加载sqoop生成的jar。
解决方案1。将hadoop更改为以单节点集群模式运行，http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/singlecluster.html.
解决方案2。首先生成jar文件，然后使用-libjars参数。