Hadoop运行错误 Hadoop运行时遇到java.io.FileNotFoundException错误的解决办法
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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% by default. 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。
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