Github user zjureel commented on a diff in the pull request:
https://github.com/apache/flink/pull/4022#discussion_r119779957
--- 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 --
It's a good point, I will put `getYarnClient()` in the `try` block
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