"No one is harder on a talented person than the person themselves" - Linda Wilkinson ; "Trust your guts and don't follow the herd" ; "Validate direction not destination" ;

May 11, 2014

Weekend Reading Notes

Session #1 Netflix's Distributed Computing Strategies: Optimistic Design for the Eventual Consistency Model

Good Netflix Case study on Cassandra for High Performance DB's
  • In a master / slave configuration there is a interval for data sync
  • Early 2000's reads were done on replicated databases 
  • Repair option possible in cassandara
  • MYSQL users - Facebook, Zappos, Symantec etc..
  • FB replays logs across Slave systems 
  • Remove Foreign keys to improve performance
  • Netflix Cassandra cluster (1 Million writes / Reads worked successfully) - More reads link
  • Benchmarking Cassandra Scalability on AWS - Over a million writes per second
  • Pessimistic Design - High Consistency = High Latency, Performance issues 
  • Optimistic Design - Trust Data Store, For 1% or edge cases have contingency plans
  • Example, Amazon (Low Consistency, sometimes sell items not in inventory), Send a polite email, 10% credit for next purchase
Session #2How Python Scripts Power Drones

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