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https://issues.apache.org/jira/browse/ZOOKEEPER-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hongchao Deng resolved ZOOKEEPER-1989.
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Resolution: Fixed
> backward compatibility of zoo.cfg
> ---------------------------------
>
> Key: ZOOKEEPER-1989
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1989
> Project: ZooKeeper
> Issue Type: Sub-task
> Components: tests
> Affects Versions: 3.5.0
> Reporter: Hongchao Deng
> Assignee: Hongchao Deng
> Priority: Blocker
> Fix For: 3.5.0
>
>
> Before 3.5.x, users define zoo.cfg with "clientPort" parameter which is used
> to identify on which port the server is serving clients.
> After upgrading to 3.5.x, the new format:
> {noformat}
> server.$id=$addr:$port1:$port2[:$role];[$cliAddr:]$cliPort
> {noformat}
> force users to define all the client ports on the entire ZK ensemble.
> The goal of this issue is to preserve backward compatibility upgrading 3.4 to
> 3.5.
> 1. when a user defines an old-style config file, it should function the same
> as the old way -- It should use clientPort variable and shouldn't create a
> dynamic file.
> 2. when a user with old-style config file tries to do reconfig relevant jobs,
> it should stop him and give out a warning.
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