Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/1486#discussion_r17768962
--- Diff: core/src/main/scala/org/apache/spark/scheduler/TaskLocation.scala
---
@@ -22,13 +22,35 @@ package org.apache.spark.scheduler
* In the latter case, we will prefer to launch the task on that
executorID, but our next level
* of preference will be executors on the same host if this is not
possible.
*/
--- End diff --
Would you mind beefing up the documentation here a bit? I am having trouble
reading through and quickly finding out the difference between HostTaskLocation
and ExecutorCacheTaskLocation. I guess the latter is exclusively used for the
BlockManager cache, but it would be good to be explicit.
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