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Sharing is Caring In Datacenter Networks. A cloud computing discussion led by Justine. Techniques we learned today. Random can work “pretty well” (VLB/ECMP) to avoid collisions in DC networks.
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Sharing is Caring In Datacenter Networks A cloud computing discussion led by Justine
Techniques we learned today • Random can work “pretty well” (VLB/ECMP) to avoid collisions in DC networks. • For bulk computing applications like Dryad and MR, optimizing transfers rather than flowsmakes jobs run much faster. • Using a centralized controller • To schedule (Orchestra) • To route and reroute (Hedera) …can improve performance.
But let’s be careful about when they’re useful… • Bulk computing frameworks • Flows are large • Flows come in batches - transfers • Can typically modify endpoints • Front-end/Web Services • Flows are small • Flows arise on-demand • Want flows to complete as quickly as possible
But let’s be careful about when they’re useful… • And what about multi-tenant environments, e.g. EC2? • Traffic patterns are varied • Fairness very important • Limited or no ability to change end-host stack
What’s missing from the centralized schedulers in Hedera and Orchestra?
None of these papers focused on network topology – is topology even relevant?
