Providing the latest version of a data item from an N-replica set
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United States of America Patent
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Dec 8, 2009
Grant Date -
Nov 9, 2006
app pub date -
May 4, 2005
filing date -
May 4, 2005
priority date (Note) -
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Abstract
Less-restrictive techniques are provided for ensuring that replicated-data systems will never provide out-of-date version of data items. A replicated-data system maintains a version number, a membership group identifier, and a membership count, with each replica of a data item. These values are maintained in such a way as to allow the replicated-data system to reliably satisfy some read requests even though half, or less than half, of the replicas of the data item are available.
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