Multi-stream Object Upload in Distributed File Systems
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Solution Overview
Problem
Traditional file system interfaces are not suitable for large object stores, lacking usability and scalability, and fail to provide efficient data access and upload capabilities, especially in trillion-scale object stores.
Innovation Solution
A distributed file system that operates in both object-based and POSIX-style modes, offering a uniform interface for multi-stream data upload, allowing simultaneous commitment of data blocks and flexible error handling to ensure data integrity and availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional file system interfaces are used to access large object stores, then usability is improved, but scalability and performance deteriorate due to overwhelming metadata
Solution Approach 1:
The patent segments the file system into two distinct modes: object-based mode for scalable metadata-free access and POSIX-style mode for traditional file operations. This segmentation allows each mode to handle different access patterns efficiently, avoiding the metadata overhead problem in object stores while preserving usability where needed.
Solution Approach 2:
The file system dynamically switches between object-based mode and POSIX-style mode based on the access requirements. Clients can selectively operate in different modes, allowing the system to adapt to varying usability and scalability needs without being constrained by a single interface paradigm.
2Adaptability or versatility
If object-based data access is used, then scalability is improved, but data access performance deteriorates compared to POSIX-style access
Solution Approach 1:
The system dynamically selects between object-based mode for scalability and POSIX-style mode for performance-critical operations. This dynamic switching allows the file system to optimize for either scalability or speed depending on the specific access requirements, rather than being constrained by a single access model.
3Device complexity
If single-stream upload is used in object-based mode, then simplicity is maintained, but upload speed deteriorates due to sequential block commitment
Solution Approach 1:
The upload process is segmented into multiple independent streams, each capable of committing blocks to different storage nodes simultaneously. This segmentation transforms the single sequential upload channel into multiple parallel channels, dramatically increasing upload throughput while maintaining the simplicity of the object-based interface.
Solution Approach 2:
The system changes the parameter of parallelism by allowing multiple upload streams to operate concurrently, each independently committing blocks to storage nodes. This parameter change from sequential to parallel operation directly addresses the upload speed limitation while preserving the object-based mode's simplicity.
4Productivity
If multiple blocks are committed in parallel, then upload speed is improved, but data integrity deteriorates due to error propagation
Solution Approach 1:
The parallel block commitment process is segmented into independent streams, where each stream operates autonomously. This segmentation isolates errors to specific streams, preventing error propagation across the entire upload process. Failed streams can be independently retried without affecting other streams' integrity.
Solution Approach 2:
The system implements feedback mechanisms where storage nodes acknowledge successful block commitments to client processing nodes. This feedback allows the system to detect and handle errors in individual streams, maintaining data integrity while enabling parallel uploads through selective retry of failed streams.
Data Source
AI summary
A distributed file system is provided having multi-stream object-based data upload. A distributed file system comprises a plurality of client processing nodes, wherein one or more of the plurality of client processing nodes selectively operate in one or more of an object-based mode and a POSIX-style mode; and a plurality of storage nodes, wherein one or more of the plurality of client processing nodes transfer multiple portions of the same data entity (e.g., an object or a file) substantially simultaneously to one or more of the storage nodes. A uniform interface is optionally provided to access the object-based mode and the POSIX-style mode. The multiple portions of the same data entity comprise blocks and multiple blocks can be committed substantially simultaneously in parallel. Committed data containing an error that was uploaded using the object-based mode becomes unavailable for further object-based access until the error is repaired using the POSIX-style mode.