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From 丁冬超 (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7682) taskTracker could not start because "Failed to set permissions" to "ttprivate to 0700"
Date Wed, 12 Sep 2012 10:10:09 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453878#comment-13453878

丁冬超 commented on HADOOP-7682:

the same  on hadoop  1.0.1  with win7 and cygwin  。  
 because just test  ,so  i suggest a easy workaround :
1、  alert  FileUtil
mkdir $HADOOP_HOME/classes  
and  then alter the  org.apache.hadoop.fs.FileUtil.checkReturnValue  remove the Exception
build  、copy FileUtil.class  to $HADOOP_HOME/classes   。

2 、alter classpath 

add shell in  $HADOOP_HOME/hadoop  file :

if [ -d "$HADOOP_HOME/classes" ]; then

make sure this classpath is in front of  $HADOOP_HOME/hadoop-core-1.*.*.jar  。

restart    OK  

> 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: 1.0.1
>         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,
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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