nandorsoma commented on code in PR #6225:
URL: https://github.com/apache/nifi/pull/6225#discussion_r941155396


##########
nifi-nar-bundles/nifi-mqtt-bundle/nifi-mqtt-processors/src/main/java/org/apache/nifi/processors/mqtt/common/AbstractMQTTProcessor.java:
##########
@@ -199,16 +198,13 @@ public ValidationResult validate(String subject, String 
input, ValidationContext
             .defaultValue(ALLOWABLE_VALUE_CLEAN_SESSION_TRUE.getValue())
             .build();
 
-    public static final PropertyDescriptor PROP_MQTT_VERSION = new 
PropertyDescriptor.Builder()
-            .name("MQTT Specification Version")
-            .description("The MQTT specification version when connecting with 
the broker. See the allowable value descriptions for more details.")
-            .allowableValues(
-                    ALLOWABLE_VALUE_MQTT_VERSION_AUTO,
-                    ALLOWABLE_VALUE_MQTT_VERSION_311,
-                    ALLOWABLE_VALUE_MQTT_VERSION_310
-            )
-            .defaultValue(ALLOWABLE_VALUE_MQTT_VERSION_AUTO.getValue())
-            .required(true)
+    public static final PropertyDescriptor PROP_SESSION_EXPIRY_INTERVAL = new 
PropertyDescriptor.Builder()
+            .name("Session Expiry Interval")
+            .description("After this interval the broker will expire the 
client and clear the session state.")
+            .addValidator(StandardValidators.NON_NEGATIVE_LONG_VALIDATOR)
+            .dependsOn(PROP_MQTT_VERSION, ALLOWABLE_VALUE_MQTT_VERSION_500)
+            .dependsOn(PROP_CLEAN_SESSION, ALLOWABLE_VALUE_CLEAN_SESSION_FALSE)
+            .defaultValue(Long.toString(SESSION_EXPIRY_INTERVAL_IN_SECONDS))
             .build();

Review Comment:
   Thanks for the suggestion @tpalfy ! I like this solution however there are 
similar properties in the processor where just numbers without units were used. 
I think it is better to stick to the original version to avoid mixing the input 
types. Nevertheless I've added a hint to the name of the property to match the 
other properties.



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