近期看了一下partitioner。于是照着写了一个列子。最后发现程序并没有将结果分开写入对应的文件，结果还是一个文件，于是乎感觉是不是没实用集群去执行程序，发现control中还是本地执行的代码：
<span style="font-size:12px;">2015-08-09 09:53:02,193 WARN [main] conf.Configuration (Configuration.java:loadProperty(2172)) - file:/tmp/hadoop-cau/mapred/staging/cau1745029252/.staging/job_local1745029252_0001/job.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.retry.interval; Ignoring. 2015-08-09 09:53:02,195 WARN [main] conf.Configuration (Configuration.java:loadProperty(2172)) - file:/tmp/hadoop-cau/mapred/staging/cau1745029252/.staging/job_local1745029252_0001/job.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.attempts; Ignoring. 2015-08-09 09:53:02,632 WARN [main] conf.Configuration (Configuration.java:loadProperty(2172)) - file:/tmp/hadoop-cau/mapred/local/localRunner/cau/job_local1745029252_0001/job_local1745029252_0001.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.retry.interval; Ignoring. 2015-08-09 09:53:02,634 WARN [main] conf.Configuration (Configuration.java:loadProperty(2172)) - file:/tmp/hadoop-cau/mapred/local/localRunner/cau/job_local1745029252_0001/job_local1745029252_0001.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.attempts; Ignoring. 2015-08-09 09:53:02,657 INFO [main] mapreduce.Job (Job.java:submit(1272)) - The url to track the job: http://localhost:8080/ 2015-08-09 09:53:02,659 INFO [main] mapreduce.Job (Job.java:monitorAndPrintJob(1317)) - Running job: job_local1745029252_0001 2015-08-09 09:53:02,662 INFO [Thread-12] mapred.LocalJobRunner (LocalJobRunner.java:createOutputCommitter(323)) - OutputCommitter set in config null 2015-08-09 09:53:02,679 INFO [Thread-12] mapred.LocalJobRunner (LocalJobRunner.java:createOutputCommitter(341)) - OutputCommitter is org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter 2015-08-09 09:53:02,810 INFO [Thread-12] mapred.LocalJobRunner (LocalJobRunner.java:run(389)) - Waiting for map tasks</span>
于是乎，想着打包到集群去执行看看，结果节点报了各种错！
：
<span style="font-size:12px;">15/08/09 10:02:41 INFO mapreduce.Job: The url to track the job: http://master:8088/proxy/application_1438842873940_0002/ 15/08/09 10:02:41 INFO mapreduce.Job: Running job: job_1438842873940_0002 15/08/09 10:02:54 INFO mapreduce.Job: Job job_1438842873940_0002 running in uber mode : false 15/08/09 10:02:54 INFO mapreduce.Job: map 0% reduce 0% 15/08/09 10:02:55 INFO mapreduce.Job: Task Id : attempt_1438842873940_0002_m_000000_0, Status : FAILED Container launch failed for container_1438842873940_0002_01_000002 : java.lang.IllegalArgumentException: java.net.UnknownHostException: slave7 at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:377) at org.apache.hadoop.security.SecurityUtil.setTokenService(SecurityUtil.java:356) at org.apache.hadoop.yarn.util.ConverterUtils.convertFromYarn(ConverterUtils.java:237) at org.apache.hadoop.yarn.client.api.impl.ContainerManagementProtocolProxy$ContainerManagementProtocolProxyData.newProxy(ContainerManagementProtocolProxy.java:218) at org.apache.hadoop.yarn.client.api.impl.ContainerManagementProtocolProxy$ContainerManagementProtocolProxyData.<init>(ContainerManagementProtocolProxy.java:196) at org.apache.hadoop.yarn.client.api.impl.ContainerManagementProtocolProxy.getProxy(ContainerManagementProtocolProxy.java:117) at org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherImpl.getCMProxy(ContainerLauncherImpl.java:403) at org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherImpl$Container.launch(ContainerLauncherImpl.java:138) at org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherImpl$EventProcessor.run(ContainerLauncherImpl.java:369) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722) Caused by: java.net.UnknownHostException: slave7</span>
终于问题还是没解决，哪位大侠指点一下吧。
小弟还没入门。在此叩谢！！！