jakubzytka opened a new pull request, #3107:
URL: https://github.com/apache/cassandra/pull/3107

   Speculative reads will now be triggered after sampleReadLatency past the 
replica reads are issued instead of past queryStartNanoTime. It's because 
sampleReadLatency measures the actual execution of read request whereas 
queryStartNanoTime may, after CASSANDRA-19215, be measured before wait in the 
NativeTransportRequests queue.
   
   Patch by Jakub Zytka; reviewed by TBD for CASSANDRA-19330


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