    
         
        void
      </span>
      <span class="sympad">onProducerStart</span>
      <span class="normal">(String requestId, String producerName)</span>
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    <div class="jd-details-descr">
      
  <div class="jd-tagdata jd-tagdescr"><p>Called whenever a producer starts processing unit of work. This method might be called multiple
 times, but between any two consecutive calls to onProducerStart onProducerFini