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https://issues.apache.org/jira/browse/IMPALA-4618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Norbert Luksa resolved IMPALA-4618.
-----------------------------------
Fix Version/s: Impala 3.4.0
Resolution: Fixed
> # hosts is inaccurate in exec summary when mt_dop > 0
> -----------------------------------------------------
>
> Key: IMPALA-4618
> URL: https://issues.apache.org/jira/browse/IMPALA-4618
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 2.8.0
> Reporter: Tim Armstrong
> Assignee: Norbert Luksa
> Priority: Major
> Labels: multithreading, ramp-up, supportability
> Fix For: Impala 3.4.0
>
>
> I'm seeing this on a 3-node minicluster:
> {code}
> 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
> {code}
> 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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