ivankelly commented on issue #1380: addBookieAndCheckCovered in RRQuorumCoverageSet doesn't work correctly if AcqQuorumSize is greater than (WriteQuorumSize+1)/2 URL: https://github.com/apache/bookkeeper/issues/1380#issuecomment-386551005 @reddycharan @sijie Yes, it's as @sijie says. checkCovered is not for the write path as such. Not really for the read path either. It's for fencing. The intuition behind it is, if a entry X has been acknowledged to the client, it has to have been written to a full ack quorum of bookies. Conversely, if at least one bookie in each possible ack quorum has acknowledged the a fence operation, then it is impossible for any entry to be acknowledged to the client from that point on.
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