租约

A lease is a contract that gives its holder specified rights over property for a limited period of time. In the context of caching, a lease grants to its holder control over writes to the covered datum during the term of the lease, such that the server must obtain the approval of the leaseholder before the datum may be written. When a leaseholder grants approval for a write, it invalidates its local copy of the da 租约是一个租约持有人在一定时间内有特别的权限的合约. 在缓存这个场景下,租约保证他的持有人在租约期限内有写的权限 , 所以当服务器

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• Leases: An Efficient Fault-Tolerant Mechanism for Distributed File Cache Consistency