abstractdog commented on code in PR #461:
URL: https://github.com/apache/tez/pull/461#discussion_r2884078034


##########
tez-dag/src/main/java/org/apache/tez/dag/app/DAGAppMaster.java:
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@@ -2415,13 +2416,15 @@ public static void main(String[] args) {
       // Install the tez class loader, which can be used add new resources
       TezClassLoader.setupTezClassLoader();
       Thread.setDefaultUncaughtExceptionHandler(new 
YarnUncaughtExceptionHandler());
-      final String pid = System.getenv().get("JVM_PID");

Review Comment:
   while I like using ProcessHandle instead of `JVM_PID`, I'm not sure if this 
is 100% correct
   I'm concerned by the fact that `JVM_PID` is used in yarn too, see in hadoop 
code, e.g. 
https://github.com/apache/hadoop/blob/f49c49aa083b9324ae432902f94a7aaf98f543ea/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/YarnChild.java#L126
   
   also, not 100% sure if JVM pid belongs to the Java process id or the 
`launch_container.sh` shell scripts provided by yarn



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