Accumulating star knowledge in replicated data protocol
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United States of America Patent
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Apr 3, 2012
Grant Date -
Sep 24, 2009
app pub date -
Mar 24, 2008
filing date -
Mar 24, 2008
priority date (Note) -
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Abstract
A distributed system includes full and partial replicas of a set of data items that may be inserted, modified, or deleted by any replica. Replicas may occasionally synchronize with other arbitrarily chosen replicas to learn about updates. A replica's knowledge includes one or more knowledge fragments, where each fragment indicates a set of items. A type of knowledge fragment, called a star knowledge fragment, contains versions associated with all items in the system. Star knowledge fragments are compact because the set of items stored at a replica need not be explicitly listed. Once all replicas know of all updates in the system, partial and full replicas will have the same compact star knowledge fragment.
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