Intro

• Global Service
• Object store (key-value pairs)
• Buckets must have a globally unique name
• Buckets are defined at the regional level
• Objects have a key (full path to the object): s3://my_bucket/my_folder/another_folder/my_file.txt
• The key is composed of bucket + prefix + object name s3://my_bucket*/my_folder/another_folder/***my_file.txt**
• There’s no concept of directories within buckets (just keys with very long names that contain slashes)
• Max Object Size: 5TB
• Durability: 99.999999999% (total 11 9's)

<aside> 💡 S3 delivers strong read-after-write consistency (if an object is overwritten and immediately read, S3 always returns the latest version of the object). However, bucket configuration is eventually consistent (if you delete a bucket and immediately list all buckets, the deleted bucket might still appear in the list).

</aside>

Bucket Versioning

• Enabled at the bucket level
• Protects against unintended deletes
• Ability to restore to a previous version
• Any file that is not versioned prior to enabling versioning will have version null
• Suspending versioning does not delete the previous versions, just disables it for the future
• To restore a deleted object, delete it's delete marker