GEODE-10231 : Add configuration for suppressing FunctionException logging

geode-docs/developing/function_exec/function_execution.html.md.erb

@@ -57,7 +57,7 @@ See [Authorization of Function Execution](../../managing/security/implementing_a
         -   For partitioned regions, the `PartitionRegionHelper` provides access to additional information and data for the region. For single regions, use `getLocalDataForContext`. For colocated regions, use `getLocalColocatedRegions`.
             **Note:**
             When you use `PartitionRegionHelper.getLocalDataForContext`, `putIfAbsent` may not return expected results if you are working on local data set instead of the region.
-    4.  To propagate an error condition or exception back to the caller of the function, throw a FunctionException from the `execute` method. <%=vars.product_name%> transmits the exception back to the caller as if it had been thrown on the calling side. See the Java API documentation for [FunctionException](/releases/latest/javadoc/org/apache/geode/cache/execute/FunctionException.html) for more information.
+    4.  To propagate an error condition or exception back to the caller of the function, throw a FunctionException from the `execute` method. <%=vars.product_name%> transmits the exception back to the caller as if it had been thrown on the calling side. See the Java API documentation for [FunctionException](/releases/latest/javadoc/org/apache/geode/cache/execute/FunctionException.html) for more information. Note, FunctionException logging on server side can be disabled by the Log4J filter for marker FUNCTION\_EXCEPTION\_MARKER. See [Advanced Users—Configuring Log4j 2 for <%=vars.product_name%>](../../managing/logging/configuring_log4j2.html) for more details.
 
 Example function code:
 

geode-docs/managing/logging/configuring_log4j2.html.md.erb

@@ -64,6 +64,11 @@ Custom Log4j 2 configuration in <%=vars.product_name%> comes with some caveats a
 
     You can enable the GEODE\_VERBOSE log statements by changing `onMatch="DENY"` to `onMatch="ACCEPT"`. Typically, it's more useful to simply enable DEBUG or TRACE on certain classes or packages instead of for the entire <%=vars.product_name%> product. However, this setting can be used for internal debugging purposes if all other debugging methods fail.
 -   The usage of filters can have an impact on performance. <%=vars.product_name%> has some logging optimizations that are deactivated when filters are used (except for the GEODE_VERBOSE marker mentioned previously).
+-   The FUNCTION\_EXCEPTION\_MARKER marker (Log4J2 Marker) can be used to FunctionException logs on server side during execution function. For example  <%=vars.product_name%> `log4j2.xml` filter disables FunctionException logs with this line:
+
+    ``` pre
+    <MarkerFilter marker="FUNCTION_EXCEPTION_MARKER" onMatch="DENY" onMismatch="NEUTRAL"/>
+    ```
 
 - Geode's custom Log4j 2 Appenders can be used in a custom log4j2.xml. This requires: