merlimat opened a new pull request #1461: If cursor update to BK fails, 
fallback to meta store
URL: https://github.com/apache/incubator-pulsar/pull/1461
 
 
   ### Motivation
   
   If writes to BK are failing we cannot update the cursor. If the writes are 
failing because the disk is full, we have a circular problem, since we cannot 
easily delete old data by moving the cursors forward.
   
   In case of BK write errors, try to update the cursor in ZK as a fallback 
strategy. If that fails as well, give up.

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