Paxos Sample Clauses

Paxos. The only known completely-safe and largely-live agreement protocol • Lets all nodes agree on the same value despite node failures, network failures, and delays – Only blocks in exceptional circumstances that are vanishingly rare in practice • Extremely useful, e.g.: – nodes agree that client X gets a lock – nodes agree that Y is the primary – nodes agree that Z should be the next operation to be executed Paxos Is Everywhere • Widely used in both industry and academia • Examples: – Google: Chubby (Paxos-based distributed lock service) • Most Google services use Chubby directly or indirectly – Yahoo: Zookeeper (Paxos-based distributed lock service) – MSR: Frangipani (Paxos-based distributed lock service) • The YFS labs contain a Paxos assignment, hopefully we’ll get to it – UW: Scatter (Paxos-based consistent DHT) – Open source: • libpaxos (Paxos-based atomic broadcast) • Zookeeper is open-source and integrates with Hadoop Paxos Properties • Safety – If agreement is reached, everyone agrees on the same value – The value agreed upon was proposed by some node • Fault tolerance (i.e., as-good-as-it-gets liveness) – If less than half the nodes fail, the rest nodes reach agreement eventually • No guaranteed termination (i.e., imperfect liveness) – Paxos may not always converge on a value, but only in very degenerate cases that are improbable in the real world • Ah, and lots of awesomeness  – Basic idea seems natural in retrospect, but why it works in any detail is incredibly complex! 17 • High-level overview • Detailed operation 18 • High-level overview • Detailed operation • Paxos is similar to 2PC, but with some twists • One (or more) node decides to be coordinator (proposer) • Proposer proposes a value and solicits acceptance from others (acceptors) • Proposer announces the chosen value or tries again if it’s failed to converge on a value • Values to agree on: proposer acceptors • Whether to commit/abort a transaction • Which client should get the next lock • Which write we perform next • What time to meet (rmb. party example) 20 • Paxos is similar to 2PC, but with some twists • One (or more) node decides to be coordinator (proposer) • Proposer proposes a value and solicits acceptance from others (acceptors) • Proposer announces the chosen value or tries again if it’s failed to converge on a value proposer acceptors
Sample 1
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Paxos. Definition 1.11 (ticket). A ticket is a weaker form of a lock, with the following properties: • Reissuable: A server can issue a ticket, even if previously issued tickets have not yet been returned. • Ticket expiration: If a client sends a message to a server using a previ- ously acquired ticket t, the server will only accept t, if t is the most recently issued ticket.
Sample 1

Related to Paxos

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