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What is it? a convenience wrapper around Lucene to allow for fast searching in a distributed system it stores data itself across multiple horizontal nodes data are stored in JSON documents excels at full-text search near real time search results, making it su...

Push Type Message Queue optimized for latency messages are pushed out as soon as they arrive client (consumer) is lightweight load balancing amount competing consumers flow control hard to configure the push speed when not knowing the current work load of...

ref: Jordan Key characteristics WideColumnStore Eventual Consistency Tunable ACID LSM Tree Index Bloom filter Designed for single partition read and write It's recommended that read and write of the same data go to the same shard Index no global secondary...

What is CI/CD? Continous Integration and Continouse Delivery an automated workflow that simplifies testing and deployment when a feature is pushed, it triggeres automated testing, then if everything is ok, changes are merged to release branch, and when condit...

Stream Processing Frameworks Key Use Cases: Real-time analytics: Fraud detection, anomaly detection, recommendation systems Data pipelines: ETL (Extract, Transform, Load), data ingestion, data enrichment Stream processing: IoT data processing, financial ma...

Explain Kubernetes Architecture API server, controller manager, scheduler, etcd kubelet, kube-proxy, POD, containers What is container orchestration create/updaste/delete containers automatically based on the deloyment needs autoscaling What is a context ...

Don't use business related field as primary key business related fields examples: individual tax number, national company number, etc it's not a good idea: some business related field data may change don't have control over this field (format may change in f...

Kafka Fail Reason 1: Lack of Expertise and Resources scaling and implementing Kafka solutions requires a high degree of expertise installation, development, operations underprovisioned configuration results in high risk of system failures, but overprovisioned...

Print dependencies tree flutter pub deps -s tree How to get virtual device storage on host machine?

Core component of CloudWatch Metrics collects performance data points, like EC2 CPU, or # of reqests to a Lambda function Logs a centralized service for collecting, storing, and analyzing log files Alarms set a threshold on any metric Dashboards Even...

Question 1 Topic: Monitoring & Logging Scenario: A company has a mobile application that makes HTTP API calls to an Application Load Balancer (ALB), which routes requests to an AWS Lambda function. Multiple versions of the application are in use, defined in th...

Q21 A company is tired of maintaining the servers (EC2) that run their build tool (Jenkins). They also need to encrypt their software files (artifacts) for security. What is the lowest maintenance way to fix both problems? A: Keep the servers, but use automati...

Infrastructure as Code Same concept as K8S Each resources is tagged, so can be easily tracked in cost management Saving strategy: automatically delete the DEV env at 5pm and recreate at 8am Automated generate of infrastructure diagram Separation of concerns ...

Question 41 How should a DevOps engineer configure near-real-time status updates and manual approval requests from AWS CodePipeline to post to a custom chat tool with webhook support? Options: A: Create a CloudWatch Logs subscription filtering on CodePipeline ...

What is IAM access control who can access (authentication)? and what can they access (authorization)? Identity authentication Policy authorization Role a named collection of access rights Service Role a specific type of role usually used by a AWS serv...