Github user andrewor14 commented on the pull request:

    https://github.com/apache/spark/pull/11888#issuecomment-203675470
  
    OK, @rxin and I discussed this more offline. Our proposal is:
    ```
    def getExecutorInfos: Seq[SparkExecutorInfo]
    
    private class SparkExecutorInfoImpl(
        val host: String,
        val port: Int,
        ...
        val cacheSize: Long,
        val numRunningTasks: Int)
     extends SparkExecutorInfo
    ```
    Then we don't need to tie us down with the very specific `host:port` 
format, and we don't have to expose the executor IDs, which are just integers 
that don't mean much.


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