Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/11888#issuecomment-203559116
My proposal:
```
def getExecutorIds(): Array[String]
def getExecutorInfo(executorId: String): Option[SparkExecutorInfo]
private class SparkExecutorInfoImpl(
val id: String,
val hostport: String, // host:port
...
val cacheSize: Long,
val numRunningTasks: Int)
extends SparkExecutorInfo
```
This is more consistent with the existing status API, where we have things
like
```
def getActiveJobIds(): Array[Int]
def getJobInfo(jobId: Int): Option[SparkJobInfo]
```
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