acceptedEpoch not handling zxid rollover in lower 32bits
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                 Key: ZOOKEEPER-1278
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1278
             Project: ZooKeeper
          Issue Type: Bug
          Components: server
    Affects Versions: 3.4.0, 3.5.0
            Reporter: Patrick Hunt
            Priority: Blocker
             Fix For: 3.5.0, 3.4.1


When the lower 32bits of a zxid "roll over" (zxid is a 64 bit number, however 
the upper 32 are considered the epoch number) the epoch number (upper 32 bits) 
are incremented and the lower 32 start at 0 again.

This should work fine, however, afaict, in the current 3.4/3.5 the 
acceptedEpoch/currentEpoch files are not being updated for this case.

See ZOOKEEPER-335 for changes from 3.3 branch.

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