This task’s steps are as same as the steps involved in installing CDH but the scenario is different, as we’re adding hosts to an existing cluster. Once the cluster is setup and running, you may have the requirement for adding new nodes to the cluster. To do that, ensure initial OS configurations/prechecks are complete. Go […]
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Install CDH using Cloudera Manager
After the installation of Cloudera Manager (SCM server), we can install CDH on our hosts using Cloudera Manager. Step 1: Login to CM url. When you login to CM for the first time after the installation of Cloudera SCM server, the login will redirect you to the following steps. Select the desired edition. Choose the […]
Continue ReadingInstall Cloudera Manager server and agents
There are three ways to install the Cloudera Manager(server, agents), CDH and services. Automated installation by Cloudera Manager Install using Cloudera Manager parcels/packages Manual installation using Cloudera Manager Tarballs Automated installation by Cloudera Manager: This is the most preferred way to install Cloudera Manager in non-production/test environments. This is not recommended for production deployments. […]
Continue ReadingCreate encrypted zones in HDFS
Encryption at rest is the process of encrypting the data stored in the HDFS. This is a very advanced topic and to create an encryption zone you need to do below steps. Enable Kerberos Enable TLS/SSL Add Java Keystore KMS service (This will act as KTS as well) In production environment, you need to create […]
Continue ReadingInstall and configure Sentry
Before adding Sentry, below are the general prerequisites need to be done. This may be mentioned in the problem description. Please confirm the hive warehouse directory detail in /etc/hive/conf/hive-site.xml file. The Hive warehouse directory (/user/hive/warehouse) must be owned by the Hive user and group and should have 771 permissions. # sudo –u hdfs hadoop fs […]
Continue ReadingAdd a service using Cloudera Manager
Your running cluster will be having only core services (HDFS, YARN, Zookeeper) or handful of services and your task is to add a specific service to the cluster. To add a service: Go to CM – click the drop down box near the cluster – select Add service. You will get a list of services […]
Continue ReadingCCA131 – Cloudera Certified Administrator Certification Exam Feedback
I took the Cloudera CCA131 Administrator exam last week and passed the certification. In this post, I’ll explain you about the exam pattern as described by Cloudera, how to prepare for the exam, the topics you should be aware of, study materials, tips, feedback etc., Little background about me: I have 3+ […]
Continue ReadingCreate/restore a snapshot of an HDFS directory
HDFS Snapshots are read-only point-in-time copies of the file system. Snapshots can be taken on a directory of the file system or the entire file system. To enable a snapshot on a specific directory, Go to CM – HDFS – File Browser Select the directory in the file browser, select ‘Enable Snapshots’ in the right […]
Continue ReadingConfigure Hue user authorization and authentication
When you access Hue after installation, by default the first user that logs into Hue becomes the first admin user. CM – Hue – Web UI After you logged in, go to admin tab – Manage Users Now provide the username of the user you want to provide access and add them in appropriate profile/groups. […]
Continue ReadingInstall new type of I/O compression library in cluster
File/data compression brings two major benefits: it reduces the space needed to store files and it speeds up data transfer across the network or to or from disk. When dealing with large volumes of data, both of these savings can be significant. Hadoop supports the following compression types and codecs: gzip – org.apache.hadoop.io.compress.GzipCodec bzip2 – […]
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