hadoop 运行 jar出错：java.lang.ClassNotFoundException: Class Mapper not found

最新推荐文章于 2022-09-03 00:10:35 发布
最新推荐文章于 2022-09-03 00:10:35 发布
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本文链接：https://blog.youkuaiyun.com/qq_28969139/article/details/88132064
本文记录了在Win10x64、CentOS7.2环境下使用Hadoop2.4.1进行MapReduce任务时遇到的问题。主要错误为无法找到Mapper类WCMapper，导致任务执行失败。

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环境： win10 x64、centos7.2、hadoop2.4.1、jdk1.8

报错：执行 hadoop jar wc.jar WCRunner

[yx@bigdata00 ~]$ hadoop jar wc.jar WCRunner
Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /home/yx/app/hadoop-2.4.1/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
19/03/04 18:47:50 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
19/03/04 18:47:51 INFO client.RMProxy: Connecting to ResourceManager at bigdata00/192.168.2.100:8032
19/03/04 18:47:51 WARN mapreduce.JobSubmitter: Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
19/03/04 18:47:51 WARN mapreduce.JobSubmitter: No job jar file set.  User classes may not be found. See Job or Job#setJar(String).
19/03/04 18:47:51 INFO input.FileInputFormat: Total input paths to process : 1
19/03/04 18:47:51 INFO mapreduce.JobSubmitter: number of splits:1
19/03/04 18:47:52 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1551674462324_0009
19/03/04 18:47:52 INFO mapred.YARNRunner: Job jar is not present. Not adding any jar to the list of resources.
19/03/04 18:47:52 INFO impl.YarnClientImpl: Submitted application application_1551674462324_0009
19/03/04 18:47:52 INFO mapreduce.Job: The url to track the job: http://bigdata00:8088/proxy/application_1551674462324_0009/
19/03/04 18:47:52 INFO mapreduce.Job: Running job: job_1551674462324_0009
19/03/04 18:47:58 INFO mapreduce.Job: Job job_1551674462324_0009 running in uber mode : false
19/03/04 18:47:58 INFO mapreduce.Job:  map 0% reduce 0%
19/03/04 18:48:01 INFO mapreduce.Job: Task Id : attempt_1551674462324_0009_m_000000_0, Status : FAILED
Error: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class WCMapper not found
        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1895)
        at org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperClass(JobContextImpl.java:186)
        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:722)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
        at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:167)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1556)
        at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
Caused by: java.lang.ClassNotFoundException: Class WCMapper not found
        at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1801)
        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1893)
        ... 8 more

19/03/04 18:48:06 INFO mapreduce.Job: Task Id : attempt_1551674462324_0009_m_000000_1, Status : FAILED
Error: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class WCMapper not found
        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1895)
        at org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperClass(JobContextImpl.java:186)
        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:722)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
        at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:167)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1556)
        at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
Caused by: java.lang.ClassNotFoundException: Class WCMapper not found
        at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1801)
        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1893)
        ... 8 more

19/03/04 18:48:10 INFO mapreduce.Job: Task Id : attempt_1551674462324_0009_m_000000_2, Status : FAILED
Error: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class WCMapper not found
        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1895)
        at org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperClass(JobContextImpl.java:186)
        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:722)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
        at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:167)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1556)
        at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
Caused by: java.lang.ClassNotFoundException: Class WCMapper not found
        at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1801)
        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1893)
        ... 8 more

19/03/04 18:48:16 INFO mapreduce.Job:  map 100% reduce 100%
19/03/04 18:48:16 INFO mapreduce.Job: Job job_1551674462324_0009 failed with state FAILED due to: Task failed task_1551674462324_0009_m_000000
Job failed as tasks failed. failedMaps:1 failedReduces:0

19/03/04 18:48:16 INFO mapreduce.Job: Counters: 9
        Job Counters 
                Failed map tasks=4
                Launched map tasks=4
                Other local map tasks=3
                Rack-local map tasks=1
                Total time spent by all maps in occupied slots (ms)=11765
                Total time spent by all reduces in occupied slots (ms)=0
                Total time spent by all map tasks (ms)=11765
                Total vcore-seconds taken by all map tasks=11765
                Total megabyte-seconds taken by all map tasks=12047360
[yx@bigdata00 ~]$ hadoop fs -rmr /wc/output 
rmr: DEPRECATED: Please use 'rm -r' instead.
Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /home/yx/app/hadoop-2.4.1/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
19/03/04 18:53:54 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
19/03/04 18:53:55 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 0 minutes, Emptier interval = 0 minutes.
Deleted /wc/output

 

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[root@localhost sqoop-1.4.7.bin__hadoop-2.6.0]# bin/sqoop export --connect jdbc:mysql://localhost:3306/dbtaobao --username root --password 123456 --table user_log --export-dir '/user/hive/warehouse/dbtaobao.db/inner_user_log' --fields-terminated-by ','; Warning: /usr/sqoop/sqoop-1.4.7.bin__hadoop-2.6.0/../hbase does not exist! HBase imports will fail. Please set $HBASE_HOME to the root of your HBase installation. Warning: /usr/sqoop/sqoop-1.4.7.bin__hadoop-2.6.0/../hcatalog does not exist! HCatalog jobs will fail. Please set $HCAT_HOME to the root of your HCatalog installation. Warning: /usr/sqoop/sqoop-1.4.7.bin__hadoop-2.6.0/../accumulo does not exist! Accumulo imports will fail. Please set $ACCUMULO_HOME to the root of your Accumulo installation. Warning: /usr/sqoop/sqoop-1.4.7.bin__hadoop-2.6.0/../zookeeper does not exist! Accumulo imports will fail. Please set $ZOOKEEPER_HOME to the root of your Zookeeper installation. 2025-06-06 00:44:19,902 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7 2025-06-06 00:44:20,015 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead. 2025-06-06 00:44:20,281 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset. 2025-06-06 00:44:20,287 INFO tool.CodeGenTool: Beginning code generation Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary. 2025-06-06 00:44:22,137 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `user_log` AS t LIMIT 1 2025-06-06 00:44:22,270 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `user_log` AS t LIMIT 1 2025-06-06 00:44:22,293 INFO orm.CompilationManager: HADOOP_MAPRED_HOME is /usr/hadoop/hadoop-3.1.3 注: /tmp/sqoop-root/compile/2647ebe9a3777fcaa95ca65a919294ec/user_log.java使用或覆盖了已过时的 API。 注: 有关详细信息, 请使用 -Xlint:deprecation 重新编译。 2025-06-06 00:44:26,610 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-root/compile/2647ebe9a3777fcaa95ca65a919294ec/user_log.jar 2025-06-06 00:44:26,629 INFO mapreduce.ExportJobBase: Beginning export of user_log 2025-06-06 00:44:26,629 INFO Configuration.deprecation: mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address 2025-06-06 00:44:27,018 INFO Configuration.deprecation: mapred.jar is deprecated. Instead, use mapreduce.job.jar 2025-06-06 00:44:28,689 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false 2025-06-06 00:44:28,961 INFO Configuration.deprecation: mapred.reduce.tasks.speculative.execution is deprecated. Instead, use mapreduce.reduce.speculative 2025-06-06 00:44:28,966 INFO Configuration.deprecation: mapred.map.tasks.speculative.execution is deprecated. Instead, use mapreduce.map.speculative 2025-06-06 00:44:28,966 INFO Configuration.deprecation: mapred.map.tasks is deprecated. Instead, use mapreduce.job.maps 2025-06-06 00:44:29,494 INFO impl.MetricsConfig: loaded properties from hadoop-metrics2.properties 2025-06-06 00:44:29,762 INFO impl.MetricsSystemImpl: Scheduled Metric snapshot period at 10 second(s). 2025-06-06 00:44:29,762 INFO impl.MetricsSystemImpl: JobTracker metrics system started 2025-06-06 00:44:30,031 INFO input.FileInputFormat: Total input files to process : 1 2025-06-06 00:44:30,053 INFO input.FileInputFormat: Total input files to process : 1 2025-06-06 00:44:30,136 INFO mapreduce.JobSubmitter: number of splits:4 2025-06-06 00:44:30,284 INFO Configuration.deprecation: mapred.map.tasks.speculative.execution is deprecated. Instead, use mapreduce.map.speculative 2025-06-06 00:44:30,660 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_local583218486_0001 2025-06-06 00:44:30,660 INFO mapreduce.JobSubmitter: Executing with tokens: [] 2025-06-06 00:44:31,271 INFO mapred.LocalDistributedCacheManager: Creating symlink: /tmp/hadoop-root/mapred/local/1749141870870/libjars <- /usr/sqoop/sqoop-1.4.7.bin__hadoop-2.6.0/libjars/* 2025-06-06 00:44:31,278 WARN fs.FileUtil: Command 'ln -s /tmp/hadoop-root/mapred/local/1749141870870/libjars /usr/sqoop/sqoop-1.4.7.bin__hadoop-2.6.0/libjars/*' failed 1 with: ln: 无法创建符号链接"/usr/sqoop/sqoop-1.4.7.bin__hadoop-2.6.0/libjars/*": 没有那个文件或目录 2025-06-06 00:44:31,278 WARN mapred.LocalDistributedCacheManager: Failed to create symlink: /tmp/hadoop-root/mapred/local/1749141870870/libjars <- /usr/sqoop/sqoop-1.4.7.bin__hadoop-2.6.0/libjars/* 2025-06-06 00:44:31,278 INFO mapred.LocalDistributedCacheManager: Localized file:/tmp/hadoop/mapred/staging/root583218486/.staging/job_local583218486_0001/libjars as file:/tmp/hadoop-root/mapred/local/1749141870870/libjars 2025-06-06 00:44:31,569 INFO mapreduce.Job: The url to track the job: http://localhost:8080/ 2025-06-06 00:44:31,571 INFO mapreduce.Job: Running job: job_local583218486_0001 2025-06-06 00:44:31,614 INFO mapred.LocalJobRunner: OutputCommitter set in config null 2025-06-06 00:44:31,631 INFO mapred.LocalJobRunner: OutputCommitter is org.apache.sqoop.mapreduce.NullOutputCommitter 2025-06-06 00:44:31,798 INFO mapred.LocalJobRunner: Waiting for map tasks 2025-06-06 00:44:31,802 INFO mapred.LocalJobRunner: Starting task: attempt_local583218486_0001_m_000000_0 2025-06-06 00:44:32,000 INFO mapred.Task: Using ResourceCalculatorProcessTree : [ ] 2025-06-06 00:44:32,006 INFO mapred.MapTask: Processing split: Paths:/user/hive/warehouse/dbtaobao.db/inner_user_log/000000_0:355065+59179,/user/hive/warehouse/dbtaobao.db/inner_user_log/000000_0:414244+59179 2025-06-06 00:44:32,012 INFO Configuration.deprecation: map.input.file is deprecated. Instead, use mapreduce.map.input.file 2025-06-06 00:44:32,012 INFO Configuration.deprecation: map.input.start is deprecated. Instead, use mapreduce.map.input.start 2025-06-06 00:44:32,012 INFO Configuration.deprecation: map.input.length is deprecated. Instead, use mapreduce.map.input.length 2025-06-06 00:44:32,050 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false 2025-06-06 00:44:32,260 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false 2025-06-06 00:44:32,299 INFO mapreduce.AutoProgressMapper: Auto-progress thread is finished. keepGoing=false 2025-06-06 00:44:32,328 INFO mapred.LocalJobRunner: Starting task: attempt_local583218486_0001_m_000001_0 2025-06-06 00:44:32,357 INFO mapred.Task: Using ResourceCalculatorProcessTree : [ ] 2025-06-06 00:44:32,359 INFO mapred.MapTask: Processing split: Paths:/user/hive/warehouse/dbtaobao.db/inner_user_log/000000_0:0+118355 2025-06-06 00:44:32,387 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false 2025-06-06 00:44:32,524 INFO mapreduce.AutoProgressMapper: Auto-progress thread is finished. keepGoing=false 2025-06-06 00:44:32,553 INFO mapred.LocalJobRunner: Starting task: attempt_local583218486_0001_m_000002_0 2025-06-06 00:44:32,566 INFO mapred.Task: Using ResourceCalculatorProcessTree : [ ] 2025-06-06 00:44:32,567 INFO mapred.MapTask: Processing split: Paths:/user/hive/warehouse/dbtaobao.db/inner_user_log/000000_0:118355+118355 2025-06-06 00:44:32,585 INFO mapreduce.Job: Job job_local583218486_0001 running in uber mode : false 2025-06-06 00:44:32,587 INFO mapreduce.Job: map 0% reduce 0% 2025-06-06 00:44:32,616 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false 2025-06-06 00:44:32,745 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false 2025-06-06 00:44:32,799 INFO mapreduce.AutoProgressMapper: Auto-progress thread is finished. keepGoing=false 2025-06-06 00:44:32,866 INFO mapred.LocalJobRunner: Starting task: attempt_local583218486_0001_m_000003_0 2025-06-06 00:44:32,901 INFO mapred.Task: Using ResourceCalculatorProcessTree : [ ] 2025-06-06 00:44:32,903 INFO mapred.MapTask: Processing split: Paths:/user/hive/warehouse/dbtaobao.db/inner_user_log/000000_0:236710+118355 2025-06-06 00:44:32,930 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false 2025-06-06 00:44:33,004 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false 2025-06-06 00:44:33,034 INFO mapreduce.AutoProgressMapper: Auto-progress thread is finished. keepGoing=false 2025-06-06 00:44:33,049 INFO mapred.LocalJobRunner: map task executor complete. 2025-06-06 00:44:33,050 WARN mapred.LocalJobRunner: job_local583218486_0001 java.lang.Exception: java.io.IOException: java.lang.ClassNotFoundException: user_log at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:492) at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:552) Caused by: java.io.IOException: java.lang.ClassNotFoundException: user_log at org.apache.sqoop.mapreduce.TextExportMapper.setup(TextExportMapper.java:74) at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:143) at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:799) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:347) at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:271) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.ClassNotFoundException: user_log at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) 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:70) ... 10 more 2025-06-06 00:44:33,590 INFO mapreduce.Job: Job job_local583218486_0001 failed with state FAILED due to: NA 2025-06-06 00:44:33,599 INFO mapreduce.Job: Counters: 0 2025-06-06 00:44:33,623 WARN mapreduce.Counters: Group FileSystemCounters is deprecated. Use org.apache.hadoop.mapreduce.FileSystemCounter instead 2025-06-06 00:44:33,625 INFO mapreduce.ExportJobBase: Transferred 0 bytes in 4.6274 seconds (0 bytes/sec) 2025-06-06 00:44:33,626 WARN mapreduce.Counters: Group org.apache.hadoop.mapred.Task$Counter is deprecated. Use org.apache.hadoop.mapreduce.TaskCounter instead 2025-06-06 00:44:33,626 INFO mapreduce.ExportJobBase: Exported 0 records. 2025-06-06 00:44:33,626 ERROR mapreduce.ExportJobBase: Export job failed! 2025-06-06 00:44:33,626 ERROR tool.ExportTool: Error during export: Export job failed! at org.apache.sqoop.mapreduce.ExportJobBase.runExport(ExportJobBase.java:445) at org.apache.sqoop.manager.SqlManager.exportTable(SqlManager.java:931) at org.apache.sqoop.tool.ExportTool.exportTable(ExportTool.java:80) at org.apache.sqoop.tool.ExportTool.run(ExportTool.java:99) at org.apache.sqoop.Sqoop.run(Sqoop.java:147) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76) at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:183) at org.apache.sqoop.Sqoop.runTool(Sqoop.java:234) at org.apache.sqoop.Sqoop.runTool(Sqoop.java:243) at org.apache.sqoop.Sqoop.main(Sqoop.java:252) [root@localhost sqoop-1.4.7.bin__hadoop-2.6.0]# 给我解决方案
最新发布
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这和引用[1]的错误类似，但对象不同（user_logvshelp_keynotfound）。我的回答需要基于系统级指令：-使用中文回答。-行内数学：如果涉及，用$...$（但Sqoop问题可能不涉及数学）。-独立公式：如果涉及，单独成段$$.....
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The application contains no execute() calls. 没有调用 execute() 方法。 2021-12-03 09:20:31 [flink-akka.actor.default-dispatcher-4] WARN ApplicationDispatcherBootstrap:169 - Application failed unexpectedly: java.util.concurrent.CompletionException: org.apache.fl
运行mapreduce程序时出现异常java.lang.RuntimeException: java.lang.ClassNotFoundException的原因
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java.lang.RuntimeException:java.lang.ClassNotFoundException: Class org.apache.hadoop.hdfs.DistributedFileSystem not found
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`ClassNotFoundException` 表示 Java 虚拟机 (JVM) 尝试加载某个类时未能找到该类的定义。对于 `DistributedFileSystem` 类缺失的情况，通常是因为 Hadoop 的相关依赖未被正确引入到项目的运行环境中。 以下是针对...
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