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revision 1.186 by tjl, Mon Nov 10 08:59:58 2003 UTC revision 1.187 by tjl, Mon Nov 10 09:04:08 2003 UTC
# Line 336  containing a document id, the hash of a Line 336  containing a document id, the hash of a
336  a timestamp and a serial number.  a timestamp and a serial number.
337  The most current heartbeat is obtained by sending a request  The most current heartbeat is obtained by sending a request
338  to the primary replica [#consistencytime]_.  to the primary replica [#consistencytime]_.
339  OceanStore is unique among the versioned P2P systems  OceanStore
340  in that it implements non-destructive updates,  implements non-destructive updates,
341  allowing previous versions of documents to be accessed  allowing previous versions of documents to be accessed
342  (by finding their old heartbeats through Tapestry).  (by finding their old heartbeats through Tapestry).
343  However, heartbeats are network-internal objects  However, heartbeats are network-internal objects
# Line 345  that do not exist at the file system int Line 345  that do not exist at the file system int
345  presented to the user. Therefore, even in OceanStore,  presented to the user. Therefore, even in OceanStore,
346  a user cannot simply download a version of a file  a user cannot simply download a version of a file
347  and an associated heartbeat and store them on their  and an associated heartbeat and store them on their
348  harddisk to keep the version "alive."  harddisk to keep the version "alive." Of course, the
349    very idea of Oceanstore is to make this unnecessary
350    by reliably archiving *everything*, but whether this
351    will succeed remains to be seen.
352    
353  .. [#consistencytime] Many applications  .. [#consistencytime] Many applications
354     are believed to be able to cope with looser consistency     are believed to be able to cope with looser consistency
355     semantics; for example, the NFS client for OceanStore only requests     semantics; for example, the NFS client for OceanStore only requests
356     new heartbeats less than 30 seconds old.     new heartbeats less than 30 seconds old.
357    
358    ..  is unique among the versioned P2P systems
359        in that it
360    
361  Pointer records  Pointer records
362  ===============  ===============

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