Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/2638#issuecomment-57800537
@srowen, Thank you for your comment.
Indeed, when deploy completed apps to Spark cluster, there is a particular
instance of Spark.
But Spark app developers will use artifacts in Maven Central while
developing and unit-testing. The artifacts seem to be built for Hadoop 2, so if
they want to test with Hadoop 1, it won't work.
What do you think?
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