Github user andrewor14 commented on the pull request:

    https://github.com/apache/spark/pull/5722#issuecomment-137267811
  
    OK I think one thing we all agree is that SPARK-4449 means have different 
port retries across different ports.
    
    One way to do it is to have the special syntax introduced in this patch. 
Another way we could do it is by accepting a `.maxRetries` suffix to each of 
the port configs, e.g.
    
    ```
    spark.blockManager.port 5588
    spark.blockManager.port.maxRetries 10
    ```
    means `[5588:5598]`. Perhaps this will lead to less change in Spark, though 
not much less I don't think.


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