OpenStack亚太技术大会（OSAC）openstackapacswiftalexyang-120813103312-phpapp02.ppt

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作者名字/日期
Swift架构与实践
***@SinaAppEngine
杨雨/2012-08-11
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Content
1 Principles and Architecture
2 The Practice of Swift ***@SinaAppEngine
3 Problems and Imporvemetns
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Storage Types
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Storage Types
From: 2/08/is-openstack-swift-reliable-enough-
Targets
High Reliability = High Durability + High Availability
High Durability - Replicas and Recovery
High Availability - Replicas and Partition
Low Cost - Commodity Hardware
Scale Out - No Single Bottleneck, Share Nothing
Reliability
Consistent Hashing
Reliability
Consistent Hashing with Virtual Node
Reliability
The advantages of consistent hashing:
Metadata is small;(AWS S3 has 762 billion objects)
Distribution unformity;
Peer to unication;
Load blance.
Reliability
Virtual node(partition) - Object distribution uniformity
Weight - Allocate partitions dynamically
Zone - Partition ToleranceZones can be used to group devices based on physical locations, power separations, network separations, or any other attribute that would lessen multiple replicas being unavailable at the same time.
Swift:
Ring - The index file for locating object in the cluster.