hadoop1.2.1运行wordcount报错

2024-05-07 06:48
文章标签 运行 报错 wordcount hadoop1.2

本文主要是介绍hadoop1.2.1运行wordcount报错，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

安装步骤参见http://www.tuicool.com/articles/NBvMv2
根据上述网站中的步骤安装好hadoop1.2.1，安装过程中一定要细心，文件位置不要随意放。
我就是文件位置设置同上述网站不一样，导致后续执行wordcount不成功，放出日志如下：

Meta VERSION=”1” .
Job JOBID=”job_201511301937_0004” JOBNAME=”word count” USER=”root” SUBMIT_TIME=”1448884207054” JOBCONF=”hdfs://localhost:9000/user/root/home/paomo/tmp/mapred/staging/root/.staging/job_201511301937_0004/job.xml” VIEW_JOB=”” MODIFY_JOB=”” JOB_QUEUE=”default” WORKFLOW_ID=”” WORKFLOW_NAME=”” WORKFLOW_NODE_NAME=”” WORKFLOW_ADJACENCIES=”” WORKFLOW_TAGS=”” .
Job JOBID=”job_201511301937_0004” JOB_PRIORITY=”NORMAL” .
Job JOBID=”job_201511301937_0004” LAUNCH_TIME=”1448884207728” TOTAL_MAPS=”1” TOTAL_REDUCES=”1” JOB_STATUS=”PREP” .
Task TASKID=”task_201511301937_0004_m_000002” TASK_TYPE=”SETUP” START_TIME=”1448884207752” SPLITS=”” .
MapAttempt TASK_TYPE=”SETUP” TASKID=”task_201511301937_0004_m_000002” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000002_0” START_TIME=”0” TRACKER_NAME=”tracker_paomo:localhost/127.0.0.1:51068” HTTP_PORT=”50060” LOCALITY=”OFF_SWITCH” AVATAAR=”VIRGIN” .
MapAttempt TASK_TYPE=”SETUP” TASKID=”task_201511301937_0004_m_000002” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000002_0” TASK_STATUS=”FAILED” FINISH_TIME=”0” HOSTNAME=”paomo” ERROR=”Error initializing attempt_201511301937_0004_m_000002_0:
java.io.IOException: Exception reading file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:135)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:178)
at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1289)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1226)
at org.apache.hadoop.mapred.TaskTracker 5.run(TaskTracker.java:2603)atjava.lang.Thread.run(Thread.java:745)Causedby:java.io.FileNotFoundException:Filefile:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job2015113019370004/jobTokendoesnotexist.atorg.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:402)atorg.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:255)atorg.apache.hadoop.fs.ChecksumFileSystem ChecksumFSInputChecker.(ChecksumFileSystem.java:125)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:283)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:436)
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:129)
… 5 more
” .
MapAttempt TASK_TYPE=”SETUP” TASKID=”task_201511301937_0004_m_000002” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000002_1” START_TIME=”0” TRACKER_NAME=”tracker_paomo:localhost/127.0.0.1:51068” HTTP_PORT=”50060” LOCALITY=”OFF_SWITCH” AVATAAR=”VIRGIN” .
MapAttempt TASK_TYPE=”SETUP” TASKID=”task_201511301937_0004_m_000002” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000002_1” TASK_STATUS=”FAILED” FINISH_TIME=”0” HOSTNAME=”paomo” ERROR=”Error initializing attempt_201511301937_0004_m_000002_1:
java.io.IOException: Exception reading file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:135)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:178)
at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1289)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1226)
at org.apache.hadoop.mapred.TaskTracker 5.run(TaskTracker.java:2603)atjava.lang.Thread.run(Thread.java:745)Causedby:java.io.FileNotFoundException:Filefile:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job2015113019370004/jobTokendoesnotexist.atorg.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:402)atorg.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:255)atorg.apache.hadoop.fs.ChecksumFileSystem ChecksumFSInputChecker.(ChecksumFileSystem.java:125)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:283)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:436)
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:129)
… 5 more
” .
MapAttempt TASK_TYPE=”SETUP” TASKID=”task_201511301937_0004_m_000002” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000002_2” START_TIME=”0” TRACKER_NAME=”tracker_paomo:localhost/127.0.0.1:51068” HTTP_PORT=”50060” LOCALITY=”OFF_SWITCH” AVATAAR=”VIRGIN” .
MapAttempt TASK_TYPE=”SETUP” TASKID=”task_201511301937_0004_m_000002” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000002_2” TASK_STATUS=”FAILED” FINISH_TIME=”0” HOSTNAME=”paomo” ERROR=”Error initializing attempt_201511301937_0004_m_000002_2:
java.io.IOException: Exception reading file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:135)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:178)
at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1289)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1226)
at org.apache.hadoop.mapred.TaskTracker 5.run(TaskTracker.java:2603)atjava.lang.Thread.run(Thread.java:745)Causedby:java.io.FileNotFoundException:Filefile:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job2015113019370004/jobTokendoesnotexist.atorg.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:402)atorg.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:255)atorg.apache.hadoop.fs.ChecksumFileSystem ChecksumFSInputChecker.(ChecksumFileSystem.java:125)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:283)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:436)
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:129)
… 5 more
” .
MapAttempt TASK_TYPE=”SETUP” TASKID=”task_201511301937_0004_m_000002” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000002_3” START_TIME=”0” TRACKER_NAME=”tracker_paomo:localhost/127.0.0.1:51068” HTTP_PORT=”50060” LOCALITY=”OFF_SWITCH” AVATAAR=”VIRGIN” .
MapAttempt TASK_TYPE=”SETUP” TASKID=”task_201511301937_0004_m_000002” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000002_3” TASK_STATUS=”FAILED” FINISH_TIME=”0” HOSTNAME=”paomo” ERROR=”Error initializing attempt_201511301937_0004_m_000002_3:
java.io.IOException: Exception reading file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:135)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:178)
at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1289)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1226)
at org.apache.hadoop.mapred.TaskTracker 5.run(TaskTracker.java:2603)atjava.lang.Thread.run(Thread.java:745)Causedby:java.io.FileNotFoundException:Filefile:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job2015113019370004/jobTokendoesnotexist.atorg.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:402)atorg.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:255)atorg.apache.hadoop.fs.ChecksumFileSystem ChecksumFSInputChecker.(ChecksumFileSystem.java:125)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:283)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:436)
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:129)
… 5 more
” .
Task TASKID=”task_201511301937_0004_m_000002” TASK_TYPE=”SETUP” TASK_STATUS=”FAILED” FINISH_TIME=”0” ERROR=”Error initializing attempt_201511301937_0004_m_000002_3:
java.io.IOException: Exception reading file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:135)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:178)
at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1289)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1226)
at org.apache.hadoop.mapred.TaskTracker 5.run(TaskTracker.java:2603)atjava.lang.Thread.run(Thread.java:745)Causedby:java.io.FileNotFoundException:Filefile:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job2015113019370004/jobTokendoesnotexist.atorg.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:402)atorg.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:255)atorg.apache.hadoop.fs.ChecksumFileSystem ChecksumFSInputChecker.(ChecksumFileSystem.java:125)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:283)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:436)
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:129)
… 5 more
” TASK_ATTEMPT_ID=”” .
Task TASKID=”task_201511301937_0004_m_000001” TASK_TYPE=”CLEANUP” START_TIME=”1448884209118” SPLITS=”” .
MapAttempt TASK_TYPE=”CLEANUP” TASKID=”task_201511301937_0004_m_000001” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000001_0” START_TIME=”0” TRACKER_NAME=”tracker_paomo:localhost/127.0.0.1:51068” HTTP_PORT=”50060” LOCALITY=”OFF_SWITCH” AVATAAR=”VIRGIN” .
MapAttempt TASK_TYPE=”CLEANUP” TASKID=”task_201511301937_0004_m_000001” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000001_0” TASK_STATUS=”FAILED” FINISH_TIME=”0” HOSTNAME=”paomo” ERROR=”Error initializing attempt_201511301937_0004_m_000001_0:
java.io.IOException: Exception reading file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:135)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:178)
at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1289)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1226)
at org.apache.hadoop.mapred.TaskTracker 5.run(TaskTracker.java:2603)atjava.lang.Thread.run(Thread.java:745)Causedby:java.io.FileNotFoundException:Filefile:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job2015113019370004/jobTokendoesnotexist.atorg.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:402)atorg.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:255)atorg.apache.hadoop.fs.ChecksumFileSystem ChecksumFSInputChecker.(ChecksumFileSystem.java:125)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:283)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:436)
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:129)
… 5 more
” .
MapAttempt TASK_TYPE=”CLEANUP” TASKID=”task_201511301937_0004_m_000001” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000001_1” START_TIME=”0” TRACKER_NAME=”tracker_paomo:localhost/127.0.0.1:51068” HTTP_PORT=”50060” LOCALITY=”OFF_SWITCH” AVATAAR=”VIRGIN” .
MapAttempt TASK_TYPE=”CLEANUP” TASKID=”task_201511301937_0004_m_000001” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000001_1” TASK_STATUS=”FAILED” FINISH_TIME=”0” HOSTNAME=”paomo” ERROR=”Error initializing attempt_201511301937_0004_m_000001_1:
java.io.IOException: Exception reading file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:135)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:178)
at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1289)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1226)
at org.apache.hadoop.mapred.TaskTracker 5.run(TaskTracker.java:2603)atjava.lang.Thread.run(Thread.java:745)Causedby:java.io.FileNotFoundException:Filefile:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job2015113019370004/jobTokendoesnotexist.atorg.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:402)atorg.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:255)atorg.apache.hadoop.fs.ChecksumFileSystem ChecksumFSInputChecker.(ChecksumFileSystem.java:125)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:283)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:436)
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:129)
… 5 more
” .
MapAttempt TASK_TYPE=”CLEANUP” TASKID=”task_201511301937_0004_m_000001” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000001_2” START_TIME=”0” TRACKER_NAME=”tracker_paomo:localhost/127.0.0.1:51068” HTTP_PORT=”50060” LOCALITY=”OFF_SWITCH” AVATAAR=”VIRGIN” .
MapAttempt TASK_TYPE=”CLEANUP” TASKID=”task_201511301937_0004_m_000001” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000001_2” TASK_STATUS=”FAILED” FINISH_TIME=”0” HOSTNAME=”paomo” ERROR=”Error initializing attempt_201511301937_0004_m_000001_2:
java.io.IOException: Exception reading file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:135)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:178)
at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1289)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1226)
at org.apache.hadoop.mapred.TaskTracker 5.run(TaskTracker.java:2603)atjava.lang.Thread.run(Thread.java:745)Causedby:java.io.FileNotFoundException:Filefile:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job2015113019370004/jobTokendoesnotexist.atorg.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:402)atorg.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:255)atorg.apache.hadoop.fs.ChecksumFileSystem ChecksumFSInputChecker.(ChecksumFileSystem.java:125)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:283)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:436)
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:129)
… 5 more
” .
MapAttempt TASK_TYPE=”CLEANUP” TASKID=”task_201511301937_0004_m_000001” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000001_3” START_TIME=”0” TRACKER_NAME=”tracker_paomo:localhost/127.0.0.1:51068” HTTP_PORT=”50060” LOCALITY=”OFF_SWITCH” AVATAAR=”VIRGIN” .
MapAttempt TASK_TYPE=”CLEANUP” TASKID=”task_201511301937_0004_m_000001” TASK_ATTEMPT_ID=”attempt_201511301937_0004_m_000001_3” TASK_STATUS=”FAILED” FINISH_TIME=”0” HOSTNAME=”paomo” ERROR=”Error initializing attempt_201511301937_0004_m_000001_3:
java.io.IOException: Exception reading file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:135)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:178)
at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1289)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1226)
at org.apache.hadoop.mapred.TaskTracker 5.run(TaskTracker.java:2603)atjava.lang.Thread.run(Thread.java:745)Causedby:java.io.FileNotFoundException:Filefile:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job2015113019370004/jobTokendoesnotexist.atorg.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:402)atorg.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:255)atorg.apache.hadoop.fs.ChecksumFileSystem ChecksumFSInputChecker.(ChecksumFileSystem.java:125)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:283)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:436)
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:129)
… 5 more
” .
Task TASKID=”task_201511301937_0004_m_000001” TASK_TYPE=”CLEANUP” TASK_STATUS=”FAILED” FINISH_TIME=”0” ERROR=”Error initializing attempt_201511301937_0004_m_000001_3:
java.io.IOException: Exception reading file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:135)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:178)
at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1289)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1226)
at org.apache.hadoop.mapred.TaskTracker$5.run(TaskTracker.java:2603)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.FileNotFoundException: File file:/home/paomo/tmp/mapred/local/ttprivate/taskTracker/root/jobcache/job_201511301937_0004/jobToken does not exist.
at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:402)
at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:255)
at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.(ChecksumFileSystem.java:125)
at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:283)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:436)
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:129)
… 5 more
” TASK_ATTEMPT_ID=”” .
Job JOBID=”job_201511301937_0004” FINISH_TIME=”1448884210837” JOB_STATUS=”FAILED” FINISHED_MAPS=”0” FINISHED_REDUCES=”0” FAIL_REASON=”JobCleanup Task Failure, Task: task_201511301937_0004_m_000001” .

看到粗体字，仔细想就明白tmp文件没有找到。在网上查阅很多资料，
报错受以下博客的启发http://www.it165.net/pro/html/201501/31366.html
tmp路径的设置在hadoop-1.2.1/conf/core-site.xml文件中，
进到我的安装路径下查看，发现tmp在下列路径中：
tmp路径
而我在core-site.xml中设置为/home/paomo/tmp，后来改成了
core-site中tmp的设置
很明显位置不符合，难怪找不到tmp下生成的文件。因为在运行过程中Job会生成一些临时文件，执行过程中需要用到。一个方法是修改core-site.xml中hadoop.tmp.dir的值为tmp实际存放的位置，如下图：
tmp现在的设置
再重新运行就可以了。输入：bin/hadoop jar hadoop-examples-1.2.1.jar wordcount input output
运行结果如下：
运行结果
终于看到map 100% reduce 100%。
输入bin/hadoop dfs -cat output/part-r-00000，可以查看结果。

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http://www.chinasem.cn/article/966625。

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