Could you call this `EXECUTOR_BLACKLIST_TIMEOUT` and `spark.task.executorBlacklistTimeout`. Also could you make the documentation a bit more concise and remove the informal "we" discussion. It's fine to just say something like this:

```
/* 
 * Sometimes if an executor is dead or in an otherwise invalid state, the driver
 * does not realize right away leading to repeated task failures. If enabled,
 * this temporarily prevents a task from re-launching on an executor where
 * it just failed. 
 */