Github user EronWright commented on the issue:
https://github.com/apache/flink/pull/3632
I believe the `yarn-session.sh` applies to the client-side only (which
launches the AM into the cluster). To adjust the classpath for the AM/TM, I
believe some adjust is needed here:
https://github.com/apache/flink/blob/release-1.2/flink-yarn/src/main/java/org/apache/flink/yarn/AbstractYarnClusterDescriptor.java#L644
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