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Midterm
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Problem 1 Why OK with HTTP 1.0 Why OK with NFS/UDP
LARD or L7: route connection by URL or SLB at SYN DNS (Akamai): route at connection setup by domain name Why OK with NFS/UDP every request/reply an independent packet, so can route these independently HTTP 1.1 and NFS: persistent connections can’t route request/reply on the same stream independently No effect on Akamai If route requests on connection grain, L7 or LARD will lose locality.
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Leases 1) overhead vs. recovery time
not callback time (-3) 2) server grabs lease if on wrong side of partition. reject writes e.g., timestamp writes and reject at target 3) failover, wait lease interval clients renew need failure detector and group membership could use quorum
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Large-Scale Web Caching
explain basic mechanism larger populations for same hit rate, + flatter curve ignoring deemphasizes benefit of cooperative caching 100% cacheable hit rate with sufficiently large cache effect of popularity (5 points) say something about traces (5 points)
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URL Hashing LAN good locality ==> good caching, less storage needed possibility of unbalance simple switch failure/reconfig issue (+ or -) Alternative: e.g., LARD WAN see above one hop, but no geo-locality (5) alternative: summary cache
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