Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/101#discussion_r10546469
--- Diff: core/src/main/scala/org/apache/spark/rdd/HadoopRDD.scala ---
@@ -111,6 +117,9 @@ class HadoopRDD[K, V](
protected val inputFormatCacheKey = "rdd_%d_input_format".format(id)
+ // used to build JT ID
--- End diff --
Wasn't sure what JT stood for here until later in the patch, maybe just
spell it out to JobTracker
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