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https://issues.apache.org/jira/browse/ZOOKEEPER-279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12667361#action_12667361
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Nitay Joffe commented on ZOOKEEPER-279:
---------------------------------------

More specifically, we are trying to make zoo.cfg play nicely with hadoop/hbase 
conf so that we can interpolate things like hadoop.tmp.dir as the default for 
the ZK dataDir.

> 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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