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Date: Tue, 27 Sep 2011 09:08:11 +0000 (UTC)
From: "Matthieu Lecoutre (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HADOOP-7682) taskTracker could not start
 because "Failed to set permissions" to "ttprivate to 0700"
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    [ https://issues.apache.org/jira/browse/HADOOP-7682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13115351#comment-13115351 ] 

Matthieu Lecoutre commented on HADOOP-7682:
-------------------------------------------

Thanks Magic Xie, 
  Same problem on 0.20.204 on windows
                
> taskTracker could not start because "Failed to set permissions" to "ttprivate to 0700"
> --------------------------------------------------------------------------------------
>
>                 Key: HADOOP-7682
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7682
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.20.203.0
>         Environment: OS:WindowsXP SP3 , Filesystem :NTFS, cygwin 1.7.9-1, jdk1.6.0_05
>            Reporter: Magic Xie
>
> ERROR org.apache.hadoop.mapred.TaskTracker:Can not start task tracker because java.io.IOException:Failed to set permissions of path:/tmp/hadoop-cyg_server/mapred/local/ttprivate to 0700
>     at org.apache.hadoop.fs.RawLocalFileSystem.checkReturnValue(RawLocalFileSystem.java:525)
>     at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:499)
>     at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:318)
>     at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:183)
>     at org.apache.hadoop.mapred.TaskTracker.initialize(TaskTracker.java:635)
>     at org.apache.hadoop.mapred.TaskTracker.(TaskTracker.java:1328)
>     at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:3430)
> Since hadoop0.20.203 when the TaskTracker initialize, it checks the permission(TaskTracker Line 624) of (org.apache.hadoop.mapred.TaskTracker.TT_LOG_TMP_DIR,org.apache.hadoop.mapred.TaskTracker.TT_PRIVATE_DIR, org.apache.hadoop.mapred.TaskTracker.TT_PRIVATE_DIR).RawLocalFileSystem(http://svn.apache.org/viewvc/hadoop/common/tags/release-0.20.203.0/src/core/org/apache/hadoop/fs/RawLocalFileSystem.java?view=markup) call setPermission(Line 481) to deal with it, setPermission works fine on *nx, however,it dose not alway works on windows.
> setPermission call setReadable of Java.io.File in the line 498, but according to the Table1 below provided by oracle,setReadable(false) will always return false on windows, the same as setExecutable(false).
> http://java.sun.com/developer/technicalArticles/J2SE/Desktop/javase6/enhancements/
> is it cause the task tracker "Failed to set permissions" to "ttprivate to 0700"?
> Hadoop 0.20.202 works fine in the same environment. 

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