What are the benefits of Amazon EMR? Drawbacks of AWS EMR
Benefits of Amazon EMR
Amazon EMR has many benefits. These include AWS's flexibility and cost savings over on-premises resource development.
Cost-saving
Amazon EMR costs depend on instance type, number of Amazon EC2 instances, and cluster launch area. On-demand pricing is low, but Reserved or Spot Instances save much more. Spot instances can save up to a tenth of on-demand costs.
Note
Using Amazon S3, Kinesis, or DynamoDB with your EMR cluster incurs expenses irrespective of Amazon EMR usage.
Note
Set up Amazon S3 VPC endpoints when creating an Amazon EMR cluster in a private subnet. If your EMR cluster is on a private subnet without Amazon S3 VPC endpoints, you will be charged extra for S3 traffic NAT gates.
AWS integration
Amazon EMR integrates with other AWS services for cluster networking, storage, security, and more. The following list shows many examples of this integration:
Use Amazon EC2 for cluster nodes.
Amazon VPC creates the virtual network where your instances start.
Amazon S3 input/output data storage
Set alarms and monitor cluster performance with Amazon CloudWatch.
AWS IAM permissions setting
Audit service requests with AWS CloudTrail.
Cluster scheduling and launch with AWS Data Pipeline
AWS Lake Formation searches, categorises, and secures Amazon S3 data lakes.
Its deployment
The EC2 instances in your EMR cluster do the tasks you designate. When you launch your cluster, Amazon EMR configures instances using Spark or Apache Hadoop. Choose the instance size and type that best suits your cluster's processing needs: streaming data, low-latency queries, batch processing, or big data storage.
Amazon EMR cluster software setup has many options. For example, an Amazon EMR version can be loaded with Hive, Pig, Spark, and flexible frameworks like Hadoop. Installing a MapR distribution is another alternative. Since Amazon EMR runs on Amazon Linux, you can manually install software on your cluster using yum or the source code.
Flexibility and scalability
Amazon EMR lets you scale your cluster as your computing needs vary. Resizing your cluster lets you add instances during peak workloads and remove them to cut costs.
Amazon EMR supports multiple instance groups. This lets you employ Spot Instances in one group to perform jobs faster and cheaper and On-Demand Instances in another for guaranteed processing power. Multiple Spot Instance types might be mixed to take advantage of a better price.
Amazon EMR lets you use several file systems for input, output, and intermediate data. HDFS on your cluster's primary and core nodes can handle data you don't need to store beyond its lifecycle.
Amazon S3 can be used as a data layer for EMR File System applications to decouple computation and storage and store data outside of your cluster's lifespan. EMRFS lets you scale up or down to meet storage and processing needs independently. Amazon S3 lets you adjust storage and cluster size to meet growing processing needs.
Reliability
Amazon EMR monitors cluster nodes and shuts down and replaces instances as needed.
Amazon EMR lets you configure automated or manual cluster termination. Automatic cluster termination occurs after all procedures are complete. Transitory cluster. After processing, you can set up the cluster to continue running so you can manually stop it. You can also construct a cluster, use the installed apps, and manually terminate it. These clusters are “long-running clusters.”
Termination prevention can prevent processing errors from terminating cluster instances. With termination protection, you can retrieve data from instances before termination. Whether you activate your cluster by console, CLI, or API changes these features' default settings.
Security
Amazon EMR uses Amazon EC2 key pairs, IAM, and VPC to safeguard data and clusters.
IAM
Amazon EMR uses IAM for permissions. Person or group permissions are set by IAM policies. Users and groups can access resources and activities through policies.
The Amazon EMR service uses IAM roles, while instances use the EC2 instance profile. These roles allow the service and instances to access other AWS services for you. Amazon EMR and EC2 instance profiles have default roles. By default, roles use AWS managed policies generated when you launch an EMR cluster from the console and select default permissions. Additionally, the AWS CLI may construct default IAM roles. Custom service and instance profile roles can be created to govern rights outside of AWS.
Security groups
Amazon EMR employs security groups to control EC2 instance traffic. Amazon EMR shares a security group for your primary instance and core/task instances when your cluster is deployed. Amazon EMR creates security group rules to ensure cluster instance communication. Extra security groups can be added to your primary and core/task instances for more advanced restrictions.
Encryption
Amazon EMR enables optional server-side and client-side encryption using EMRFS to protect Amazon S3 data. After submission, Amazon S3 encrypts data server-side.
The EMRFS client on your EMR cluster encrypts and decrypts client-side encryption. AWS KMS or your key management system can handle client-side encryption root keys.
Amazon VPC
Amazon EMR launches clusters in Amazon VPCs. VPCs in AWS allow you to manage sophisticated network settings and access functionalities.
AWS CloudTrail
Amazon EMR and CloudTrail record AWS account requests. This data shows who accesses your cluster, when, and from what IP.
Amazon EC2 key pairs
A secure link between the primary node and your remote computer lets you monitor and communicate with your cluster. SSH or Kerberos can authenticate this connection. SSH requires an Amazon EC2 key pair.
Monitoring
Debug cluster issues like faults or failures utilising log files and Amazon EMR management interfaces. Amazon EMR can archive log files on Amazon S3 to save records and solve problems after your cluster ends. The Amazon EMR UI also has a task, job, and step-specific debugging tool for log files.
Amazon EMR connects to CloudWatch for cluster and job performance monitoring. Alarms can be set based on cluster idle state and storage use %.
Management interfaces
There are numerous Amazon EMR access methods:
The console provides a graphical interface for cluster launch and management. You may examine, debug, terminate, and describe clusters to launch via online forms. Amazon EMR is easiest to use via the console, requiring no scripting.
Installing the AWS Command Line Interface (AWS CLI) on your computer lets you connect to Amazon EMR and manage clusters. The broad AWS CLI includes Amazon EMR-specific commands. You can automate cluster administration and initialisation with scripts. If you prefer command line operations, utilise the AWS CLI.
SDK allows cluster creation and management for Amazon EMR calls. They enable cluster formation and management automation systems. This SDK is best for customising Amazon EMR. Amazon EMR supports Go, Java,.NET (C# and VB.NET), Node.js, PHP, Python, and Ruby SDKs.
A Web Service API lets you call a web service using JSON. A custom SDK that calls Amazon EMR is best done utilising the API.
Complexity:
EMR cluster setup and maintenance are more involved than with AWS Glue and require framework knowledge.
Learning curve
Setting up and optimising EMR clusters may require adjusting settings and parameters.
Possible Performance Issues:
Incorrect instance types or under-provisioned clusters might slow task execution and other performance.
Depends on AWS:
Due to its deep interaction with AWS infrastructure, EMR is less portable than on-premise solutions despite cloud flexibility.
