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A Two-layer Geo-cloud based Dynamic Replica Creation Strategy |
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PP: 431-440 |
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Author(s) |
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Zhen Ye,
Shanping Li,
Junzan Zhou,
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Abstract |
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| To improve data availability and reduce user access latency, geo-cloud based data replication is widely used in large global
Web sites, such as Facebook. However, as the popularity of data is different and will change as time goes by, simple static replica
creation strategies that assign the same number of replicas to all data, never changing thereafter, are not suitable. To this issue, we
propose a two-layer geo-cloud based dynamic replica creation strategy called TGstag. TGstag addresses the issue with twofold: policy
constraint heuristic inter-datacenter replication and load aware adaptive intra-datacenter replication. TGstag aims to minimize both
cross-datacenter bandwidth consumption and average access time with constraints of policy and commodity node capacity. To evaluate
the effectiveness of our strategy, we’ve conducted comprehensive experiments to compare TGstag with other approaches. The results
show TGstag significantly reduces cross-datacenter bandwidth and average read access time. |
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