在windows客户端运行hadoop程序遇到问题：
DEBUG - LocalFetcher 1 going to fetch: attempt_local938878567_0001_m_000000_0
WARN - job_local938878567_0001
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.(SpillRecord.java:70)
at org.apache.hadoop.mapred.SpillRecord.(SpillRecord.java:62)
at org.apache.hadoop.mapred.SpillRecord.(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)
DEBUG - LocalFetcher 1 going to fetch: attempt_local938878567_0001_m_000000_0
DEBUG - LocalFetcher 1 going to fetch: attempt_local938878567_0001_m_000000_0
一开始只看到了org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError，所以百度这个问题，都在说是因为内存不够用了。但是修改了fetch的内存百分比也没有解决问题，后来发现底下还有一行报错是：
Caused by: java.io.FileNotFoundException: G:/tmp/hadoop-Ferdinand%20Wang/mapred
里面的百分号其实因为用户名里面有空格，所以才会报错。。。只要把用户名改成没空格的就好了。。。
参考博客：
Bug0: resolve java.io.FileNotFoundException error encountered when Hadoop plug-in runs
