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revision 1.170 by tjl, Thu Nov 6 15:40:02 2003 UTC revision 1.171 by benja, Thu Nov 6 15:49:42 2003 UTC
# Line 135  as long as the publisher regularly reque Line 135  as long as the publisher regularly reque
135  information about past versions is not stored at all.  information about past versions is not stored at all.
136    
137  In *OceanStore* [kubiatowicz00oceanstore]_,  In *OceanStore* [kubiatowicz00oceanstore]_,
138  an Internet-scale distributed data store that  an Internet-scale distributed data store based
139    on Tapestry [zhao01tapestry]_ that
140  allows users to access their files  allows users to access their files
141  from different locations, every document has a  from different locations, every document has a
142  *primary replica*, a small set of servers that  *primary replica*, a small set of servers that
# Line 149  to the primary replica [#consistencytime Line 150  to the primary replica [#consistencytime
150  OceanStore is unique among the versioned P2P systems  OceanStore is unique among the versioned P2P systems
151  in that it implements non-destructive updates,  in that it implements non-destructive updates,
152  allowing previous versions of documents to be accessed  allowing previous versions of documents to be accessed
153  (by using their old heartbeats).  (by finding their old heartbeats through Tapestry).
154  In OceanStore, requesting a document's current version  However, heartbeats are network-internal objects
155  depends on querying its primary replica; when the primary  that do not exist at the file system interface
156  replica ceases to function, the current version cannot be  presented to the user. Therefore, even in OceanStore,
157  determined any longer (for some applications, this only happens  a user cannot simply download a version of a file
158  30 seconds after the primary replica disappears).  and an associated heartbeat and store them on their
159    harddisk to keep the version "alive."
160    
161  .. [#consistencytime] Many applications  .. [#consistencytime] Many applications
162     are believed to be able to cope with looser consistency     are believed to be able to cope with looser consistency

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