# How do I debug the 'reduce()' operation of a stream UDF?

**URL:** <https://discuss.aerospike.com/t/how-do-i-debug-the-reduce-operation-of-a-stream-udf/2250>\
**Category:** User Defined Functions (UDF)\
**Tags:** udf\
**Created:** [December 11, 2015, 3:45am UTC](https://discuss.aerospike.com/t/how-do-i-debug-the-reduce-operation-of-a-stream-udf/2250 "2015-12-11T03:45:20Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![julienl](https://avatars.discourse-cdn.com/v4/letter/j/ecccb3/32.png) [@julienl](https://discuss.aerospike.com/u/julienl)\
**Post date:** [February 7, 2017, 12:35pm UTC](https://discuss.aerospike.com/t/how-do-i-debug-the-reduce-operation-of-a-stream-udf/2250/2 "2017-02-07T12:35:15Z")

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I’m facing the same issue. How can we see logs generated in the “reduce” stream udf?

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_[View the full topic](https://discuss.aerospike.com/t/how-do-i-debug-the-reduce-operation-of-a-stream-udf/2250)._