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  1. IMPALA
  2. IMPALA-4618

# hosts is inaccurate in exec summary when mt_dop > 0

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      I'm seeing this on a 3-node minicluster:

      Operator       #Hosts   Avg Time   Max Time   #Rows  Est. #Rows   Peak Mem  Est. Peak Mem  Detail            
      -------------------------------------------------------------------------------------------------------------
      06:AGGREGATE        1  212.433us  212.433us       0           1    64.00 B        -1.00 B  FINALIZE          
      05:EXCHANGE         1    0.000ns    0.000ns       0           1          0        -1.00 B  UNPARTITIONED     
      02:AGGREGATE        9  131.439us  167.821us       0           1    64.00 B       10.00 MB                    
      04:AGGREGATE        9    0.000ns    0.000ns       0          -1  183.42 MB      128.00 MB                    
      03:EXCHANGE         9  707.426ms  823.681ms  20.97M          -1          0              0  HASH(`_c0`)       
      01:AGGREGATE        9    5s222ms    5s355ms  22.89M          -1    3.83 MB      128.00 MB  STREAMING         
      00:SCAN HDFS        9    2s623ms    2s896ms  23.33M          -1  492.02 KB       88.00 MB  default.big_uuids
      

      It seems like it's reporting the # of fragment instances instead of the number of hosts.

      We should probably report both #Hosts and #Instances if mt_dop is enabled (and maybe in all cases)

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            • Assignee:
              norbertluksa Norbert Luksa
              Reporter:
              tarmstrong Tim Armstrong
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