YARN-8904. TestRMDelegationTokens can fail in testRMDTMasterKeyStateOnRollingMasterKey. Contributed by Wilfred Spiegelenburg

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/security/TestRMDelegationTokens.java

@@ -97,7 +97,17 @@ public class TestRMDelegationTokens {
     RMDelegationTokenSecretManager dtSecretManager =
         rm1.getRMContext().getRMDelegationTokenSecretManager();
     // assert all master keys are saved
-    Assert.assertEquals(dtSecretManager.getAllMasterKeys(), rmDTMasterKeyState);
+    dtSecretManager.getAllMasterKeys().forEach(managerKey -> {
+      int keyId = managerKey.getKeyId();
+      boolean found = false;
+      for (DelegationKey stateKey: rmDTMasterKeyState) {
+        if (stateKey.getKeyId() == keyId) {
+          found = true;
+          break;
+        }
+      }
+      Assert.assertTrue("Master key not found: " + keyId, found);
+    });
 
     // request to generate a RMDelegationToken
     GetDelegationTokenRequest request = mock(GetDelegationTokenRequest.class);