Adaptive Replica Synchronization for Distributed File Systems

Adaptive Replica Synchronization for Distributed File Systems
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分布式文件系统的自适应副本同步

DOI:
10.1109/jsyst.2014.2300611
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发表时间:
2015-09
影响因子:
4.4
通讯作者:
Xiaoyan Liu
Xiaoyan Liu
中科院分区:
计算机科学2区
文献类型:
--
作者:
Jianwei Liao;Li Li;Huaidong Chen;Xiaoyan Liu

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提出了一种分布式文件系统中不受元数据服务器干扰的存储服务器间自适应副本同步机制。该机制采用块列表数据结构,保存关于相关块复制品的信息,并存储在与复制品对应的关联SS上。该机制与基于版本的更新重放技术相结合,能够从客户端的角度保证数据的一致性,帮助服务支持系统以块为单位进行主动的副本同步。与依赖MDS触发同步的传统副本同步方法不同,我们提出的机制可以绕过繁琐的集中同步过程来完成相同的同步作业。此外,为了提高写密集型工作负载的I/O数据率,新提出的机制采用了延迟更新的副本同步方法。评估实验表明,在特定的应用环境中,该机制可以在较小的同步开销下获得有吸引力的I/O性能提升。
This paper presents an adaptive replica synchronization mechanism among storage servers (SSs) without the interference from the metadata server (MDS) in a distributed file system. This mechanism employs a chunk list data structure, which holds the information about the relevant chunk replicas and is stored on the associated SSs corresponding to the replicas. Combined with version-based update replay technique, our proposed mechanism can ensure data consistency from the viewpoint of clients and help the SSs to conduct replica synchronization proactively with a per-chunk granularity. In contrast to conventional approaches of replica synchronization that are reliant on the MDS to trigger the synchronization, our proposed mechanism can side step the cumbersome centralized synchronization process to accomplish the same synchronization job. Moreover, a deferred update approach for replica synchronization has been adopted by the newly proposed mechanism for contributing to I/O data rate in write-intensive workloads. The evaluation experiments show that this newly presented mechanism can achieve attractive I/O performance enhancement with less synchronization overhead in specific application contexts.
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