Fast Quorum Requirement Sample Clauses

Fast Quorum Requirement. For any rounds i and j : • If Q is an i-quorum and S is a j-quorum, then Q ∩ S Ø. • If Q is an i-quorum, R and S are j-quorums, and j is fast, then Q ∩ R ∩ S /= Ø. − − 3 , , , , In the general case, this stronger assumption requires bigger quorums. If every set of n E acceptors is a quorum for a fast round (fast quorum, for short) and every set of n F acceptors is a quorum for a classic round (classic quorum), where n is the total number of acceptors, then n must be greater than 2E +F as well as greater than 2F . These constraints are achieved, for example, if every set of 2n +1 accep- tors is a fast and classic quorum. If classic quorums are defined to be any majority of acceptors, fast quorums must be as big as 3n +1 acceptors. It has been shown that any asynchronous consensus protocol that allows a decision to be reached in two communication steps must satisfy similar quorum requirements [Lamport, 2006b] (Fast Learning Theorem). Collisions and Collision Recovery If two different values v and w are proposed in the same fast round i , it may be that none gets chosen, even in the absence of failures or suspicions, due to colli- sions [Lamport, 2006a]. A collision happens when the acceptors of a fast quorum accept different values. In pessimistic scenarios, collisions will prevent any value from being chosen in a fast round. If part of the acceptors accept v , part accept w , and the remaining never accept anything. There are three ways to break the tie and recover from a collision, and all reduce to executing a higher-numbered round. However, depending on how this new round is chosen, latency can be reduced con- siderably. Let us assume a collision has happened at round i . The simplest approach has i ’s coordinator c to monitor the acceptors’ phase “2b” messages and start a new round from the beginning after it learns the collision has happened. This approach is expensive as it takes four communication steps to recover. Assume now that numbers are discrete, that is, for any round i it is possible to determine the round l such that there is no round j , i < j < l . For simplicity, we refer to the round subsequent to i simply as i +1. If, besides being the coordinator of i , c is also the coordinator of i + 1, then c can exploit the fact that the information in “2b” messages sent for round i is essentially the same that would be sent in “1b” messages for round i + 1 if c sends “1a” message for i . Hence, c may skip the first phase and proceed directly to th...
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Fast Quorum Requirement. For any two rounds i and j: (i) If Q is an i-quorum and S is a j-quorum, then Q∩S ƒ= ∅. P P a a a ! a C C A A L L (a) Classic Round (b) Failure in a Classic Round P A L P A L
Fast Quorum Requirement. For any rounds i and j : • If Q is an i-quorum and S is a j-quorum, then Q ∩ • If Q is an i-quorum, R and S are j-quorums, and j

Related to Fast Quorum Requirement

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  • Basic Requirements To be eligible for PayPal’s Seller Protection program, all of the following basic requirements must be met, as well as any applicable additional requirements: • The primary address for your PayPal account must be in the United States. • The item must be a physical, tangible good that can be shipped, except for items subject to the Intangible Goods Additional Requirements. Transactions involving items that you deliver in person in connection with payment made in your physical store, may also be eligible for PayPal’s Seller Protection program so long as the buyer paid for the transaction in person by using a PayPal goods and services QR code. • You must ship the item to the shipping address on the Transaction Details page in your PayPal account for the transaction. If you originally ship the item to the recipient’s shipping address on the Transaction Details page but the item is later redirected to a different address, you will not be eligible for PayPal’s Seller Protection program. We therefore recommend not using a shipping service that is arranged by the buyer, so that you will be able to provide valid proof of shipping and delivery. • The shipping requirement does not apply to eligible transactions involving items that you deliver in person; provided, however, that you agree to provide us with alternative evidence of delivery or such additional documentation or information relating to the transaction that we may request. • You must respond to PayPal’s requests for documentation and other information in a timely manner as requested in our email correspondence with you or in our correspondence with you through the Resolution Center. If you do not respond to PayPal’s request for documentation and other information in the time requested, you may not be eligible for PayPal’s Seller Protection program. • If the sale involves pre-ordered or made-to-order goods, you must ship within the timeframe you specified in the listing. Otherwise, it is recommended that you ship all items within 7 days after receipt of payment. • You provide us with valid proof of shipment or delivery. • The payment must be marked “eligible” or “partially eligible” in the case of Unauthorized Transaction claims, or “eligible” in the case of Item Not Received claims, for PayPal’s Seller Protection program on the Transaction Details page. • In the case of an Unauthorized Transaction claim, you must provide valid proof of shipment or proof of delivery that demonstrates that the item was shipped or provided to the buyer no later than two days after PayPal notified you of the dispute or reversal. For example, if PayPal notifies you of an Unauthorized Transaction claim on September 1, the valid proof of shipment must indicate that the item was shipped to the buyer no later than September 3 to be eligible for PayPal’s Seller Protection program. PayPal determines, in its sole discretion, whether your claim is eligible for PayPal’s Seller Protection program. PayPal will make a decision, in its sole discretion, based on the eligibility requirements, any information or documentation provided during the resolution process, or any other information PayPal deems relevant and appropriate under the circumstances. To be eligible for PayPal’s Seller Protection program for a buyer’s Item Not Received claim, you must meet both the basic requirements and the additional requirements listed below: • Where a buyer files a chargeback with the issuer for a card-funded transaction, the payment must be marked “eligible” for PayPal’s Seller Protection on the Transaction Details page. • You must provide proof of delivery as described below.

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  • System for Award Management (XXX) Requirement Alongside a signed copy of this Agreement, Grantee will provide Florida Housing with a XXX.xxx proof of registration and Commercial and Government Entity (CAGE) number. Grantee will continue to maintain an active XXX registration with current information at all times during which it has an active award under this Agreement.

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