Github user keith-turner commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/29#discussion_r28803912
  
    --- Diff: 
minicluster/src/main/java/org/apache/accumulo/minicluster/MiniAccumuloConfig.java
 ---
    @@ -108,6 +108,19 @@ public MiniAccumuloConfig setZooKeeperStartupTime(long 
zooKeeperStartupTime) {
       }
     
       /**
    +   * Configure an existing ZooKeeper instance to use. Calling this method 
is optional. If not set, a new ZooKeeper instance is created.
    +   *
    +   * @param existingZooKeepers
    +   *          Connection string for a already-running ZooKeeper instance
    +   *
    +   * @since 1.7.0
    +   */
    +  public MiniAccumuloConfig setExistingZooKeepers(String 
existingZooKeepers) {
    --- End diff --
    
    Could have the following (this allows setter to be more strict about its 
input).
    
    ```java
       public void clearExistingZookeepers()
      /**
       * throws IllegalArgExcep if null or empty string
       */
       public void setExistingZookeepers(String ezk);
       public Optional<String> getExistingZookeepers();
    ```


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