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A Comparative Evaluation of Transparent Scaling Techniques for Dynamic Content Servers

Written by C. Amza, A. L. Cox, W. Zwaenepoel. A Comparative Evaluation of Transparent Scaling Techniques for Dynamic Content Servers. Presented by Chen Zhang 2006-10-04. Overview. What does the paper do? Designed a DB cluster architecture oriented at dynamic content web sites

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A Comparative Evaluation of Transparent Scaling Techniques for Dynamic Content Servers

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  1. Written by C. Amza, A. L. Cox, W. Zwaenepoel A Comparative Evaluation of Transparent Scaling Techniques for Dynamic Content Servers Presented by Chen Zhang2006-10-04

  2. Overview • What does the paper do? • Designed a DB cluster architecture oriented at dynamic content web sites • Evaluated transparentscaling technique combinations against TPC-W • Experimental Findings • TPC-W scales well with cluster size increase • Conflict-aware scheduling with most beneficial impact • Load balancing has secondary impact • Optimizing for locality has no impact

  3. Myth …

  4. Who is who • Sch • Scheduling • Caching • Seq • Adding sequence number • DP • Query queuing for ordering • Admission Control • DB Consistency • 1-copy-serializability

  5. Scheduler and DP • Scheduler • Parse individual queries – context-aware • Backlog for all replicated ops for active trans. • Current load of DB • Consistency among other schedulers • DP • Conflict-aware • Lock tables, not passed to DB • In order • Out-of-order • Query prioritizing (a little bit of scheduling) • Admission Control

  6. Scheduling and load balancing • Scheduling • Synchronous Replication • Content-Aware asynchronous replication • Conflict-aware deadlock avoidance • At DP, “lock tables” • Load balancing • Generic: Round Robin, Shortest Queue First • Content-aware • Shortest Execution Length First (SELF) • Locality-aware Request Distribution (LARD)

  7. Caching • Happen at schedulers • Function • Cached query results for all reads • Forwards “lock tables” • Constraint • Require low write frequency • Size • LRU as Replacement strategy • Consistency between different scheduler cache.

  8. Experiment • TPC-W Benchmark • Cluster • max 8 DB machines • 2 schedulers • Software • Apache • PHP • Mysql • Tested Combinations • Base • BestSync • ConflA • ConflACache

  9. Discussion • Recall Ganymed • Scaling • Cache • Dynamic content replication • About scheduler and DP • About degree of consistency • ……

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