If you are using Hortonworks (presently Cloudera) cluster, the default value for java is Oracle JDK 1.8. If you have … More
Category: Hadoop Administration
Dealing with ‘Blocks with no live replicas’ in the HDFS
In a previous post, we dealt about ‘Under-replicated blocks in the HDFS‘. However, while decommissioning a couple of worker nodes, … More
How to change mysql version for ambari connections?
CentOS generally comes with mysql-connector-java-5.1.17.jar. However, there are many known bugs with the same. Hortonworks suggests updating the jar to … More
Dividing folder contents into subfolders
Recently, I came across a problem of dividing a folder with N number of files into sub-folders with almost equal … More
Forgot ‘ambari’ password?
Working with multiple clusters at the same time can sometimes mean too many passwords to make note of! While for the … More
Switching between Namenodes
Once Namenode HA is configured for the Hadoop cluster, generally you have one ‘active’ and one ‘standby’ namenode. Basically, this … More
Dealing with ‘under-replicated’ blocks in the HDFS
One fine evening, I came across a notification in our HDP cluster. This was result of planned node modification which … More