feat: Implement object store shuffle write support for S3 and Azure#18
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phillipleblanc
approved these changes
Feb 6, 2026
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This pull request adds support for writing shuffle data directly to object storage backends (S3 and Azure) in Ballista, alongside improvements to shuffle storage configuration and comprehensive unit tests. The changes introduce a new execution path for shuffle writes, allowing for more flexible and scalable storage options, and provide robust parsing and validation for shuffle storage URLs.
Object store shuffle write support:
ShuffleWriterExecto write shuffle data directly to S3 or Azure object stores, using Arrow IPC format with LZ4 compression. Data is serialized in-memory and uploaded in a single operation. [1] [2] [3]Shuffle storage configuration enhancements:
ShuffleStorageConfig::from_type_and_urlmethod to robustly parse storage URLs for local, S3, and Azure backends, extracting backend-specific parameters and handling errors gracefully.Testing and validation:
from_type_and_urlcovering local, S3 (with and without prefix), Azure (with and without prefix), and invalid URL scenarios to ensure correctness and error handling.