S3 Limitations
This page describes limitations concerning the S3 service and protocol implementation.

Supported S3 APIs

The following standard S3 APIs are supported:
  • Bucket (HEAD/GET/PUT/DEL)
    • Including ListObjects and ListObjectsV2
  • Bucket Lifecycle (GET/PUT/DEL)
  • Bucket Policy (GET/PUT/DEL)
  • Bucket Tagging (GET/PUT/DEL)
  • Object (GET/PUT/DEL)
  • Object Tagging (GET/PUT/DEL)
  • Object Multiparts (POST Create/Complete, GET/DEL/PUT, GET Parts)

General Limits

Maximum number of buckets
Maximum object size
5 TiB
Maximum number of parts per upload
Part numbers
1 to 10000 (inclusive)
Part size
5 MiB to 5 GiB. The last part can be < 5 MiB
Maximum number of parts returned for a list parts request
Maximum number of multipart uploads returned in a list multipart uploads request
Note: Currently, S3 buckets and objects can only be shared from a single Weka filesystem.

Naming Limitations


  • Bucket names must be between 3 and 63 characters long.
  • Bucket names can consist only of lowercase letters, numbers, dots (.), and hyphens (-).
  • Bucket names must begin and end with a letter or number.
  • Bucket names must not be formatted as an IP address (for example,
  • Must be unique within the filesystem


  • Object key names must be up to 1024 characters long.
  • A / prefix of an object is interpreted as a directory, and such directory segments are limited to 255 characters.
  • Refer to AWS S3 object name limitations. Match them to limitations in other protocols.
Note: It is advisable to avoid special characters that might be unsupported using protocols other than S3.

Policy Limitations

Supported S3 Policy Actions

The S3 protocol implementation supports the following policy actions:
  • s3:*
    • Note: this wildcard is supported for IAM policies but not for bucket policies
  • s3:AbortMultipartUpload
  • s3:CreateBucket
  • s3:DeleteBucket
  • s3:DeleteBucketPolicy
  • s3:DeleteObject
  • s3:GetBucketLocation
  • s3:GetBucketPolicy
  • s3:GetObject
  • s3:ListAllMyBuckets
  • s3:ListBucket
  • s3:ListMultipartUploads
  • s3:ListParts
  • s3:PutBucketLifecycle
  • s3:GetBucketLifecycle
  • s3:PutBucketPolicy
  • s3:PutObject
  • s3:GetBucketTagging
  • s3:PutBucketTagging
  • s3:Get
  • s3:Put
  • s3:Delete

Lifecycle Configuration

Weka supports the AWS S3 Lifecycle Configuration elements and definitions, with the limitation of only supporting the lifecycle Expiration action.


Currently, data ingested by the S3 protocol is not counted against a defined directory quota.
Last modified 1mo ago