[Checkins] SVN: zope.fssync/trunk/src/zope/fssync/TODO.txt added todo notes from Uwe

[Amos Latteier]

Log message for revision 98033:
  added todo notes from Uwe

Changed:
  U   zope.fssync/trunk/src/zope/fssync/TODO.txt

-=-
Modified: zope.fssync/trunk/src/zope/fssync/TODO.txt
===================================================================
--- zope.fssync/trunk/src/zope/fssync/TODO.txt	2009-03-13 13:20:57 UTC (rev 98032)
+++ zope.fssync/trunk/src/zope/fssync/TODO.txt	2009-03-13 13:55:07 UTC (rev 98033)
@@ -2,13 +2,46 @@
 Things to do for the next release (in no particular order)
 ==========================================================
 
+Notes from Uwe Oestermeier on improving efficiency
+--------------------------------------------------
+
+the problem arises if a site contains large blobs.
+
+If I remember the implementation correctly, all objects are serialized
+completely into a temporary SNARF archive and streamed afterwards.  It
+would be more efficient if the SNARF could be streamed directly to the
+response. This was possible in the first version of zope.fssync.
+
+As far as I know direct streaming to the reponse is no longer
+supported in Zope3. (Jim Fulton indicates that this isn't true.)
+
+Another optimization would be if client and server could communicate
+about the necessary parts that need to be exchanged.  In ordinary
+circumstances, for instance, it is unnecessary that all items are
+serialized by a zsync update.  Checksums would be helpful here. They
+are easy to compute on write operations and could be used to compare
+the server and client state before the real data transfer
+starts. SNARFs which contain checksums instead of content data can
+also easily be cached on the server.
+
+These optimizations are of minor importance if one uses zsync mainly
+to move data from one machine to another.  For a user who want's to
+edit a few documents offline these improvements are much more
+relevant.
+
+
+
 Miscellaneous
 -------------
 
 - Remove dependency on zope.traversing which presupposes zope.app packages
+
 - Add a callback for synchronization handlers which allows to
   update caches, catalogs, etc.
 
+  synchronizer's load method may now return a callback (which in turn
+  can return a callback, etc.) So this may resolve this item.
+
 Bug Fixes
 ---------