报错信息：
java.lang.Exception: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in localfetcher#1
at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:529)
Caused by: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in localfetcher#1
at org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:134)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:376)
at org.apache.hadoop.mapred.LocalJobRunner$Job$ReduceTaskRunnable.run(LocalJobRunner.java:319)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: G:/tmp/hadoop-Ferdinand%20Wang/mapred/local/localRunner/Ferdinand%20Wang/jobcache/job_local938878567_0001/attempt_local938878567_0001_m_000000_0/output/file.out.index
at org.apache.hadoop.fs.RawLocalFileSystem.open(RawLocalFileSystem.java:198)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:766)
at org.apache.hadoop.io.SecureIOUtils.openFSDataInputStream(SecureIOUtils.java:156)
at org.apache.hadoop.mapred.SpillRecord.<init>(SpillRecord.java:70)
at org.apache.hadoop.mapred.SpillRecord.<init>(SpillRecord.java:62)
at org.apache.hadoop.mapred.SpillRecord.<init>(SpillRecord.java:57)
at org.apache.hadoop.mapreduce.task.reduce.LocalFetcher.copyMapOutput(LocalFetcher.java:124)
at org.apache.hadoop.mapreduce.task.reduce.LocalFetcher.doCopy(LocalFetcher.java:102)
at org.apache.hadoop.mapreduce.task.reduce.LocalFetcher.run(LocalFetcher.java:85)大概是说，reduce的过程失败了，错误发生在error in shuffle in localfetcher#1，是因为找不到在tmp/hadoop-username目录下的一个文件导致。
原因：
电脑用户名含有空格
G:/tmp/hadoop-Ferdinand%20Wang/mapred/local/localRunner/Ferdinand%20Wang/jobcache/job_local938878567_0001/attempt_local938878567_0001_m_000000_0/output/file.out.index到具体目录看果然找不到这个文件，问题就出在这个%20其实是空格，但是这里不允许出现空格。所以我们要修改用户名称才能解决这个问题。
虽然之前在hadoop-env.cmd这个文件中修改了，用双引号的方式可以不出现空格可以让hadoop正常启动，但是治标不治本啊。还是修改一下用户名，改了以后这个就还是用username就可以。
@rem A string representing this instance of hadoop.%USERNAME% bydefault.
set HADOOP_IDENT_STRING=%USERNAME%修改username的方法：
1、【win】+【R】快捷键调出运行；
2、输入netplwiz，再点击确定；
3、打开用户账户，双击；
4、输入您想要改的名字；
5、点击右下角的【确定】按钮之后，弹出警告，点击【是】即可。
6、重启电脑。（一定要重启）
重新启动，发现新上传的这里也改了。