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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "HowToSetupYourDevelopmentEnvironment" by AlexLoddengaard
Date Thu, 28 Aug 2008 07:10:27 GMT
Dear Wiki user,

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The following page has been changed by AlexLoddengaard:

  This was a specific error that I received that probably no one else will receive.  The error
has to do with a permission issue when running Hadoop.  At runtime, Hadoop SSHes into all
nodes, including itself in a single-node setup.  This error occurred because some LDAP groups
that I belonged to were not found at Hadoop runtime.  If you get an error like this, then
there can be a number of things wrong, but very generally you have a permissions error.  The
following guide may  help if you're running Ubuntu: http://wiki.apache.org/hadoop/Running_Hadoop_On_Ubuntu_Linux_%28Single-Node_Cluster%29
+ == could only be replicated to 0 nodes, instead of 1 ==
+ I was getting this error when putting data into the dfs.  The solution is strange and probably
inconsistent: I erased all temporary data along with the namenode, reformatted the namenode,
started everything up, and visited my "cluster's" dfs health page (http://your_host:50070/dfshealth.jsp).
 The last step, visiting the health page, is the only way I can get around the error.  Once
I've visited the page, putting and getting files in and out of the dfs works great!

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