Variable expansion in zoo.cfg
-----------------------------

                 Key: ZOOKEEPER-279
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-279
             Project: Zookeeper
          Issue Type: Improvement
            Reporter: Nitay Joffe
            Priority: Minor


We would like to define certain parts of ZooKeeper's configuration using 
variables that get substituted. For example, we want the ZooKeeper quorum to be 
able to use a dataDir configured per user. In other words, something like:

tickTime=2000
dataDir=/tmp/zookeeper-${user.name}
clientPort=2181
initLimit=5
syncLimit=2
server.1=zoo1:2888:3888
server.2=zoo2:2888:3888
server.3=zoo3:2888:3888

I think Java already has a system for configuration that allows something like 
this using Properties?

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