Github user zentol commented on a diff in the pull request: https://github.com/apache/flink/pull/4022#discussion_r119448300 --- Diff: flink-yarn/src/main/java/org/apache/flink/yarn/AbstractYarnClusterDescriptor.java --- @@ -392,6 +392,7 @@ protected YarnClient getYarnClient() { @Override public YarnClusterClient retrieve(String applicationID) { + final YarnClient yarnClient = getYarnClient(); try { // check if required Hadoop environment variables are set. If not, warn user if (System.getenv("HADOOP_CONF_DIR") == null && --- End diff -- does `getYarnClient()` fail if this condition is fulfilled? If so we should put this if block before the call to `getYarnClient()`.
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