aljoscha commented on a change in pull request #7702: 
[FLINK-11088][Security][YARN] Allow YARN to discover pre-installed keytab files
URL: https://github.com/apache/flink/pull/7702#discussion_r390330498
 
 

 ##########
 File path: 
flink-yarn/src/main/java/org/apache/flink/yarn/entrypoint/YarnEntrypointUtils.java
 ##########
 @@ -90,16 +90,27 @@ public static Configuration loadConfiguration(String 
workingDirectory, Map<Strin
 
                final String keytabPath;
 
-               if (env.get(YarnConfigKeys.KEYTAB_PATH) == null) {
+               if (env.get(YarnConfigKeys.LOCAL_KEYTAB_PATH) == null) { // 
keytab not exist
                        keytabPath = null;
                } else {
-                       File f = new File(workingDirectory, 
Utils.KEYTAB_FILE_NAME);
-                       keytabPath = f.getAbsolutePath();
+                       File f;
+                       f = new File(env.get(YarnConfigKeys.LOCAL_KEYTAB_PATH));
+                       if (f.exists()) { // keytab file exist in host 
environment.
+                               keytabPath = f.getAbsolutePath();
+                       } else {
+                               f = new File(workingDirectory, 
env.get(YarnConfigKeys.LOCAL_KEYTAB_PATH));
+                               if (f.exists()) { // keytab file exist in 
working directory.
+                                       keytabPath = f.getAbsolutePath();
+                               } else { // fall back to default keytab file
+                                       f = new File(workingDirectory, 
Utils.DEFAULT_KEYTAB_FILE);
 
 Review comment:
   Aren't we duplicating the default logic here? If nothing is set the default 
setting in the Flink `Configuration` should already be `DEFAULT_KEYTAB_FILE`.

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