Hongchao Deng created ZOOKEEPER-1950:
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             Summary: configBackwardCompatibilityMode breaks compatibility
                 Key: ZOOKEEPER-1950
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1950
             Project: ZooKeeper
          Issue Type: Bug
            Reporter: Hongchao Deng


The current implementation divide information of servers into a separate 
dynamic config file. There is a problem.

When we set "clientPort" variable in config file, it gets automatically erased 
and later on there is no information about "clientPort" in either the old or 
new (.dynamic) config file.

It becomes a serious problem when users of *3.4* jump to *3.5* directly without 
changing their config. When a server crashes and restarts, there is no client 
port serving.



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