HDFS : never change replication factor with snapshot
You use hdfs and for some reasons you want to change replication factor from 3 to 2 for a specific directory ?
Running a Role handler from a playbook
If you are well organized you have multiple roles to manage you deployment and configuration If you know the Ansible handler power you use it to manage all the operations on your software, services and so on. It is simple to trigger a handler inside a role task, but have you ever imagined using the…
Export Hbase tables from HDP 2.6 to CDP 7.1
In this post I will describe my journey during a migration from Hortonworks HDP 2.6 to Cloudera CDP 7.1. I have to export the Hbase tables from an old and less secure cluster to a more recent and secure cluster. The application that used the Hbase tables can’t stop for a long time and have…
Calling a loop task to filter and construct final json result in Ansible
Sometimes you need to : iterate a payload call an API for each item filtering the json result using json_query returning a final result with all the filtered result With this result you can iterate for another API. This article talk about how to do that using Ansible, json_query filter
Restoring Kerberos Master Key in OpenLdap
One of the classic architecture when using a Kerberos KDC and OpenLdap is to store the KDC database in OpenLdap backend.You can find a procedure to do that on the MIT Kerberos documentation site The advantage of storing your KDC in OpenLdap backend is to take advantage of the OpenLdap replication process that is easy…
Hdfs top users by actions
Sometimes it could be difficult to identifying the activities that are stressing your namenodes. Following is an article on how to have the top users by hdfs actions on your HDFS Cluster requesting the Namenode JMX
Namenode monitoring
When having trouble with your Big Data cluster, it could be interesting to automatically generate some monitoring for your namenode.
Hive ACID activation side effect
In this article, I will describe the impact of the Hive ACID activation on a running cluster HDP 2.6.4
Adding custom metrics in Ambari Metrics
In this article I will show you how to add custom metrics in the Hortonworks Ambari Metrics for following Zookeeper health with Grafana.
Zookeeper 4 letters words admin commands
In this article we will discover Zookeeper 4 letters commands to help us to monitor Zookeper
