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April 4, 2014
Wikipedia Export

Input For Page Ranking Using Hadoop

If you are new to Hadoop, you are probably tired of WordCount and want to get hands on with some real use cases.¬†Page ranking is an […]
March 3, 2014

Fixing org.apache.hadoop.security.AccessControlException: Permission denied

Executions in Hadoop use the underlying logged in username to figure out the permissions in the cluster. When running jobs or working with HDFS, the user […]
February 17, 2014

One Of Several Explanations To “could only be replicated to 0 nodes” Error

There could be several reasons when you see “could only be replicated to 0 nodes” message in your exception when you are trying to write something […]
February 8, 2014

Configuring MultipleInputs-InputFormats-Mappers In Oozie MapReduce Action

This post explains how to write a Oozie MapReduce action with Multiple Inputs and how each Inputs are configured to use different InputFormats and Mappers Lets […]
February 2, 2014

Fixing java.io.IOException: Incompatible namespaceIDs

This post explains the fix when you see the below error when starting Datanode.   [crayon-5a121c872107a013579461/]   This is a well documented issue. Check this JIRA […]
January 26, 2014

Troubleshooting Hive Action In Oozie

In this post we are going to troubleshoot a failing Hive action in Oozie. The Hive action we have is very simple, it tries to add […]