Enabling Big Data on Kubernetes is a good practice for the transition of smooth data. Apache Hadoop is a framework that allows storing large data in distributed mode and distributed processing on that large datasets. It is designed in such a way that it scales from a single server to thousands of servers. The Apache Hadoop has solutions for all kinds to business issues including:
Hadoop itself intended to detect the failures at the application layer and handle that failure. Hadoop 3.0 is a major release after Hadoop 2 with new features like HDFS erasure coding, improves the performance and scalability, multiple NameNodes, and many more.
Wrap Namenode in a Service; Kubernetes pod uses a Service resource.
Kubernetes Service basically gives an IP/hostname in the cluster which load balances incoming requests across the selected pods.
The pods give NameNode pod a label say App - namenode and creates service i.e. selected pods with that labels.
Identify data node through Stateful Sets:- Stateful application such as Kubernetes provides another resource called Stateful Sets to help such applications.
In a Stateful Set, each pod gets identified by its name, its storage, and its hostname.
Run fully distributed HDFS on a single node - In the Kubernetes world, the distribution is at the container level. If more than one node, manage a dedicated disk, runs on a single node; its distributed and now, a fully distributed HDFS runs on a single machine.
What are the benefits of Big Data on Kubernetes?
Support multiple standby NameNodes.
Supports multiple NameNodes for multiple namespaces.
An open source stream processing platform for the software, written in JAVA and SCALA which is initially developed by LinkedIn and then was donated to the Apache Software Foundation. Click to explore about, Apache Kafka Security with Kerberos on Kubernetes
What are the best practices of Big Data on Kubernetes?
The best practices of Big Data on Kubernetes are highlighted below:
Keep the Image Small- Before start looking around for base images. An application requires a size not more than 15MB, using a 600MB image is a wastage of resources. When less MB of the image used, it makes faster Container build using lesser space.
Use a single image- It is easy for the Pod that only one Container runs. It makes Pod performance better. When multiple Containers run in Pods is a mess to connect, manage, and secure Microservices as these interrupt all communication.
Double-check base image - Many of them make mistakes while selecting an Image. All things depend on the base image. There are lots of images present on Docker Hub, select the image as per the requirement of the Project. Before using the base image to build a Docker image, double-check Base image.
Use Namespaces and Labels - Proper define Namespaces and labels during deployment of the image. Inside Kube-cluster there is Virtual Cluster called Namespace isolated from one another. For selecting subsets of objects use Labels.
Use Non-Root users inside the Container - Always prefer to use Non-Root users inside Container because of security reasons. Non Root User has selected permissions for that Container.
Services and Pods - A service is responsible for making Pods discoverable inside the network or exposing them to the internet. A Pod hosts multiple Container and storage volumes.
Be familiar with Kube Components - Multitude Components used to enhance performance, security, and reliability of Setup.
Wrap Namenode in a Service.
Identify data node through Stateful Sets.
Run fully distributed HDFS on a single node.
Tools for Enabling Big Data on Kubernetes
The best tools for enabling Big Data on Kubernetes are below mentioned:
Enabling Big Data on Kubernetes is a great work for the transition of continuous data. Apache Hadoop, no doubt is a framework that enables storing large data in distributed mode and distributed processing on that large datasets. To learn more about enabling big data on kubernetes, you are advised to look into the below steps: