Consistent Hashing for Distributed Storage Data Allocation
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Solution Overview
Problem
Distributed data storage systems face increased overhead due to managing multiple components, maintaining redundancy, and handling changes in system configuration, which affects performance and efficiency.
Innovation Solution
A data distribution system that uses a consistent hashing function or randomizing process to allocate and reallocate logical addresses among storage devices, minimizing data transfer and management overhead when devices are added or removed, while maintaining balanced access and redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple caches and multiple disks are used to provide redundancy and protection against system failure, then system reliability is improved, but system overhead increases due to managing increased number of components
Solution Approach 1:
The consistent hashing function enables the distributed storage system to automatically allocate and redistribute data blocks across multiple disks without requiring complex external management. Each disk independently determines its data blocks through the hashing function, eliminating the need for centralized allocation logic and reducing management overhead while maintaining redundancy
Solution Approach 2:
The system uses the consistent hashing function to dynamically adjust data allocation parameters based on the current set of active disks. When disks are added or removed, the hashing function automatically recalculates allocations, allowing the system to adapt to changing configurations without manual intervention or complex management protocols
2Adaptability or versatility
If components are added or removed from the distributed storage system, then system adaptability is improved, but data redistribution overhead increases
Solution Approach 1:
The invention extracts only the necessary data redistribution operations when disks are added or removed. The consistent hashing function identifies specifically which data blocks need to be moved to new disks, rather than redistributing all data. This selective extraction minimizes redistribution overhead while maintaining system adaptability
Solution Approach 2:
The consistent hashing function is pre-configured with the disk identifiers and allocation strategy, so that when disks are added or removed, the system can immediately determine the new allocation without requiring complex real-time calculations or centralized coordination, reducing redistribution time
3Stability of the object's composition
If consistent hashing function is used to allocate data blocks across disks, then allocation consistency is improved, but computational overhead increases
Solution Approach 1:
The system applies the consistent hashing function only to the specific data blocks that need allocation or redistribution, rather than calculating hashes for all data in the system. This partial application maintains allocation consistency for affected blocks while minimizing unnecessary computational overhead
Data Source
AI summary
A method for data distribution, including distributing logical addresses among an initial set of devices so as provide balanced access, and transferring the data to the devices in accordance with the logical addresses. If a device is added to the initial set, forming an extended set, the logical addresses are redistributed among the extended set so as to cause some logical addresses to be transferred from the devices in the initial set to the additional device. There is substantially no transfer of the logical addresses among the initial set. If a surplus device is removed from the initial set, forming a depleted set, the logical addresses oldie surplus device are redistributed among the depleted set. There is substantially no transfer of the logical addresses among the depleted set. In both cases the balanced access is maintained.