Commits on Nov 8, 2018

1. ft: ZENKO-1175 tailable cursor to consume mongo oplog …

   Use a tailable custor to keep ordering guarantees for the records we
   read. This also means we have to read from the beginning when we
   reconnect (at startup), and start processing when we encountered the
   unique ID previously stored in zookeeper.
   
   Also removed dispatcher mode with MongoLogReader (was only used for
   the short-lived Federation deployment of Zenko).

   

   jonathan-gramain committed Nov 8, 2018
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2. bf: ZENKO-1175 fix when no saved ID exists …

   In case where there is no saved ID yet (initial deployment), do
   process the very first entry in the log instead of skipping it. In
   practice it should not have an impact because the very first entry in
   the log is normally not due to be processed for CRR, but it ensures
   correctness.

   

   jonathan-gramain committed Nov 8, 2018
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3. Merge branch 'bugfix/ZENKO-1175-oplogSkipFix' into tmp/octopus/w/8.1/… …

   …bugfix/ZENKO-1175-oplogSkipFix

   

   bert-e committed Nov 8, 2018
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