Data consistency within a federation infrastructure
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United States of America Patent
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Jan 3, 2012
Grant Date -
Nov 20, 2008
app pub date -
Nov 7, 2007
filing date -
Nov 9, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
In some embodiments, it is determined that a primary node has been elected from among a plurality of nodes in a replica set of nodes. The primary node accepts and processes client data access requests. The replica set includes the primary node and other secondary nodes. The primary node receives client data access requests. The primary node assigns a data sequence number to each client data access request that mutates state in the order the client data access requests are received. The data sequence numbers include a linearized processing order that is to be followed by each of the nodes in the replica set. The primary node sends the mutating client data access requests including any corresponding data sequence numbers to the secondary nodes. The primary node receives, from a threshold number of secondary nodes, an acknowledgement indicating reception of the client data access request. The primary node commits the data mutating access request.
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