Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/2638#issuecomment-58596020
@marmbrus, Thank you for your comment.
The `TaskAttemptContext` is a class in
[hadoop-1](https://hadoop.apache.org/docs/r1.0.4/api/org/apache/hadoop/mapreduce/TaskAttemptContext.html)
but is an interface in
[hadoop-2](http://hadoop.apache.org/docs/r2.5.1/api/org/apache/hadoop/mapreduce/TaskAttemptContext.html).
The signatures of the method `TaskAttemptContext.getTaskAttemptID` for the
both versions are the same, so the method calls are source-compatible but NOT
binary-compatible because the opcode of method call for class is
[`INVOKEVIRTUAL`](http://cs.au.dk/~mis/dOvs/jvmspec/ref--35.html) and for
interface is
[`INVOKEINTERFACE`](http://cs.au.dk/~mis/dOvs/jvmspec/ref--32.html).
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