Tune you Linux OS to maximize the Hadoop Cluster performance by disabling “Tuned Daemon” in RHEL 7 OS. If you are setting up Hadoop Cluster in RHEL 7 servers, then you should disable the Tuned daemon Service which comes as default daemon in RHEL 7 version of Linux. Tuned daemon is introduced to boots the…
Fix under replicated blocks in HDFS In this tutorial, let’s look into, How to Fix under replicated blocks in HDFS? How to check any under replicated, missing or corrupted blocks in the cluster? You can check all the blocks information from Namenode UI or with the help of fsck command. Namnode UI – http://<namenode-IP>:50070/dfshealth.html#tab-overview 2. Using…
We will look in to Hive Sentry Roles commands. Here in this post you will get all sentry role creation and grant permission commands. 1. Create hive sentry role :- CREATE ROLE `role_name`; # Here were are using group name as hadoop-developer CREATE ROLE `hadoop-developer_role`; It is always a good practice to create a role…