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Olawale Adepoju for AWS Community Builders

Posted on • Updated on • Originally published at dev.classmethod.jp

How Kinesis Data Stream Works

Kinesis Data Stream

Kinesis data stream is a serverless streaming data service that makes it easy to capture, process, and store data streams at any scale.

Characteristics of the kinesis data stream include but are not limited to:

  • Retention between 1 day to 365 days
  • Ability to reprocess (replay) data
  • Once data is inserted in Kinesis, it can't be deleted (immutability)
  • Data that share the same partition goes to the same shard (ordering)
  • Producers: AWS SDK, Kinesis Producer Library (KPL), Kinesis Agent
  • Consumers: • Write your own: Kinesis Client Library (KCL), AWS SDK • Managed: AWS Lambda, Kinesis Data Firehose, Kinesis Data Analytics

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Kinesis Data Streams – Capacity Modes

Provisioned mode: You choose the number of shards provisioned, scale manually or using API

  • Each shard gets 1MB/s in (or 1000 records per second)
  • Each shard gets 2MB/s out (classic or enhanced fan-out consumer)
  • You pay per shard provisioned per hour

On-demand mode:

  • No need to provision or manage the capacity
  • Default capacity provisioned (4 MB/s in or 4000 records per second)
  • Scales are automatically based on observed throughput peaks during the last 30 days
  • Pay per stream per hour & data in/out per GB

Kinesis Data Streams Security

  • Control access/authorization using IAM policies
  • Encryption in flight using HTTPS endpoints
  • Encryption at rest using KMS
  • You can implement encryption/decryption of data on the client side (harder)
  • VPC Endpoints are available for Kinesis to access within VPC
  • Monitor API calls using CloudTrail

Navigate to AWS Console, search for kinesis and select kinesis data stream

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Fill up the stream name,

Select only one shard for demo purposes, you can select as many shards as you want.

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I'm making use of CloudShell

For Producer

aws kinesis put-record --stream-name DemoStream --partition-key user1 --data "user signup" --cli-binary-format raw-in-base64-out

Remember to change your stream name and press enter.

It will generate as ShardId and SequenceNumber

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For Consumer

Describe the stream

aws kinesis describe-stream --stream-name DemoStream

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Consume some data

aws kinesis get-shard-iterator --stream-name DemoStream --shard-id shardId-000000000000 --shard-iterator-type TRIM_HORIZON
aws kinesis get-records --shard-iterator

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