February 17, 2014
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
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
This post explains the fix when you see the below error when starting Datanode. 2013-12-14 23:39:09,354 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Incompatible namespaceIDs in /tmp/hadoop-hadoop-user/dfs/data: namenode namespaceID […]
January 26, 2014
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 […]
January 15, 2014
If you are learning Hadoop, you are probably tired of counting words and want to try some real analysis using real data. Amazon public dataset is […]
January 15, 2014
Running out of memory is a common occurrence if you are using Amazon EC2 free tier instances to run Hadoop and other programs for your experiments. […]
January 11, 2014
This post explains step by step procedure to build, run and test Apache Oozie 4.0.0. I will also list the issues and the fixes that I […]
