hadoop2.2运行mapreduce（wordcount）问题总结

kingulon · 发表于 2015-7-27 22:34:37

我也遇到这个问题（hadoop 2.5.2版本）：
hadoop@h1:/usr/local/hadoop/sbin$ hadoop jar /usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.2.jar wordcount /data/wordcount /output/wordcount
15/07/27 22:24:00 INFO client.RMProxy: Connecting to ResourceManager at h1/192.168.1.111:8032
15/07/27 22:24:01 INFO input.FileInputFormat: Total input paths to process : 1
15/07/27 22:24:02 INFO mapreduce.JobSubmitter: number of splits:1
15/07/27 22:24:03 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1438006948944_0002
15/07/27 22:24:03 INFO impl.YarnClientImpl: Submitted application application_1438006948944_0002
15/07/27 22:24:03 INFO mapreduce.Job: The url to track the job: http://h1:8088/proxy/application_1438006948944_0002/
15/07/27 22:24:03 INFO mapreduce.Job: Running job: job_1438006948944_0002
到这里hanging了。
原因是：执行mapreduce.job的dataNode的yarn-site.xml忘记配置了。把nameNode的yarn-site.xml的配置copy过去，重启hadoop，再执行wordcount就OK了。

ableq · 发表于 2015-11-3 21:01:45

long_ac 发表于 2015-5-9 18:14
我也遇到了任务一直在pending状态，不能往下运行，经过几天的倒腾的，总算解决了
现在把我的解决方法跟 ...

怎么知道你的wordcount使用多少内存呢？
我的这里还是768M，我的虚拟机分配了1024M内存。

hebina · 发表于 2015-11-4 17:41:38

2015-11-04 17:40:24,796ERROR [org.apache.hadoop.security.UserGroupInformation] - PriviledgedActionException as:EMP (auth:SIMPLE) cause:java.net.ConnectException: Call From EMP-PC/192.168.1.1 to TestDemo-1:9001 failed on connection exception: java.net.ConnectException: Connection refused: no further information; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
Exception in thread "main" java.net.ConnectException: Call From EMP-PC/192.168.1.1 to TestDemo-1:9001 failed on connection exception: java.net.ConnectException: Connection refused: no further information; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:783)
at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:730)
at org.apache.hadoop.ipc.Client.call(Client.java:1351)
at org.apache.hadoop.ipc.Client.call(Client.java:1300)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
at com.sun.proxy.$Proxy7.getFileInfo(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:186)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
at com.sun.proxy.$Proxy7.getFileInfo(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:651)
at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1679)
at org.apache.hadoop.hdfs.DistributedFileSystem$17.doCall(DistributedFileSystem.java:1106)
at org.apache.hadoop.hdfs.DistributedFileSystem$17.doCall(DistributedFileSystem.java:1102)
at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1102)
at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1397)
at org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.checkOutputSpecs(FileOutputFormat.java:145)
at org.apache.hadoop.mapreduce.JobSubmitter.checkSpecs(JobSubmitter.java:456)
at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:342)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1268)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1265)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:1265)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1286)
at org.dragon.hadoop.hdfs.util.worldcount.main(worldcount.java:67)
Caused by: java.net.ConnectException: Connection refused: no further information
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:529)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:493)
at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:547)
at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:642)
at org.apache.hadoop.ipc.Client$Connection.access$2600(Client.java:314)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1399)
at org.apache.hadoop.ipc.Client.call(Client.java:1318)
... 28 more

楼主这个怎么回事为什么拒绝连接呢！！！

arsenduan · 发表于 2015-11-4 17:48:25

hebina 发表于 2015-11-4 17:41
2015-11-04 17:40:24,796ERROR [org.apache.hadoop.security.UserGroupInformation] - PriviledgedActionEx ...

连接拒绝exception:java.net.connectionException:connection refused
http://www.aboutyun.com/thread-5474-1-1.html

Hadoop伪分布式环境提示Connection refused错误
http://www.aboutyun.com/thread-1632-1-1.html

下面是否修改，还有hosts是否修改
hdfs.xml文件内容的.

hebina · 发表于 2015-11-4 18:08:35

arsenduan 发表于 2015-11-4 17:48
连接拒绝exception:java.net.connectionException:connection refused
http://www.aboutyun.com/thread- ...

dfs.permissions 属性已经就是false

arsenduan · 发表于 2015-11-4 18:09:18

hebina 发表于 2015-11-4 18:08
dfs.permissions 属性已经就是false

贴出hosts内容

hebina · 发表于 2015-11-4 18:11:18

192.168.1.121 TestDemo-1
::1 localhost6.localdomain6 localhost6
192.168.1.122 TestDemo-2
192.168.1.123 TestDemo-3
192.168.1.124 TestDemo-4
192.168.1.125 TestDemo-5