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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 updated ZOOKEEPER-1989:
-------------------------------------

    Description: 
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.

  was:
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.


> 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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