When troubleshooting Hadoop related issues, we constantly need to enable DEBUG level logging so that we can see more what Hadoop is doing when running jobs. This blog post in particular shows how you can enable DEBUG logging for YARN application jobs when you run them through Hive. To do …
This article explains why a map only job was launched while running a simple “SELECT * FROM <table>” query in CDH5.5.x, while same query did not need any MapReduce task in CDH5.3.x. After upgrading to CDH5.5.1, while running “SELECT * FROM <table>” query from Beeline, a map only job was …
My new Snowflake Blog is now live. I will not be updating this blog anymore but will continue with new contents in the Snowflake world!