archive: 2015/2

Hive and Hadoop Exceptions

I installed Hive 1.0.0 on Hadoop 1.2.1. When I try to enter the Hive CLI, it reports following exceptions 1org.apache.hadoop.hive.ql.metadata.HiveException:java.io.IOException:Filesystem closed Accor

Data Analysis

A friend of mine asked me what is data analysis. This is a simple but difficult question. It is simple because we talk about data analysis all the time and everywhere. It is difficult because there a

Data Lake Stages

Edd has post a very impressive blog about how Hadoop ecosystem influence the data lake in enterprise recently. It discussed about the four following stages when enterprise’s data evolution to the dr