amazon web services
10 articles tagged amazon web services.
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How AWS IAM Policy Evaluation Works
Learn how IAM combines identity, resource, boundary, and organization policies—and why one matching deny defeats every allow.
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Amazon SQS Visibility Timeouts and Receipt Handles
How SQS hides received messages, uses receipt handles for deletion, and produces duplicate processing when workers outlive visibility timeouts.
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AWS Lambda Execution Environments and Cold Starts
How Lambda initializes execution environments, reuses their state, and creates separate environments as concurrent invocations increase.
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AWS Signature Version 4 Request Authentication
How AWS SigV4 canonicalizes requests, derives scoped HMAC keys, checks timestamps, and proves a request was not altered.
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Amazon SQS Visibility Timeout and Message Processing
Understand how SQS hides received messages, why crashes cause redelivery, and how workers safely extend processing time.
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AWS STS AssumeRole and Temporary Credentials
Understand how AWS STS validates a caller, issues role credentials, separates trust from permissions, and refreshes expiring sessions.
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AWS Lambda Execution Environment Lifecycle
How Lambda initializes, reuses, freezes, and thaws environments—and why global state changes cold-start and warm-invocation performance.
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DynamoDB Adaptive Capacity and Hot Partition Keys
DynamoDB adaptive capacity shifts unused throughput toward hot partition keys while keeping the table’s provisioned capacity unchanged.
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Amazon S3 Multipart Uploads
How S3 uploads large objects as verified parts, assembles them atomically, and why incomplete uploads must be aborted or expired.
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AWS IAM Policy Evaluation
How IAM combines identity, resource, boundary, and session policies—and why any applicable explicit deny wins.