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We consider how to monitor and debug query processing dataflows, in distributed environments such as Pig/Hadoop. Our work is motivated by a series of informal user interviews, which revealed that monitoring and debugging needs are both pressing and diverse. In response to these interviews, we created a framework for custom dataflow instrumentation, called Inspector Gadget (IG). IG makes it easy to write a wide variety of monitoring and debugging behaviors, and attaches seamlessly to andoi:10.1145/1989323.1989459 dblp:conf/sigmod/OlstonR11 fatcat:et3mroxhj5crbgiw3fhv5d7kpe