How to write a UDF which when encountered it should stop the map

hi all,
My task is to write a UDF which when encountered it should stop the map and return what is given as an input to the UDF For ex: UDF(map failed!)
when this udf is encountered than the map should stop and the output output should be mapfailed!

<i>But over there it is given to stop a particular mapping step only But my requirement is that i should stop the Entire Mapping process</i>
UDFs r used in graphical mappings and the details in blog shows that when a UDF stops a mapping, it in turn stops whole messgae mapping. So ur entire Mapping process would get stopped
Regards,
Prateek

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