[ https://issues.apache.org/jira/browse/IMPALA-6140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lars Volker updated IMPALA-6140: -------------------------------- Labels: profile (was: ) > Unexplained gap between "All backends started" and "Rows available" > ------------------------------------------------------------------- > > Key: IMPALA-6140 > URL: https://issues.apache.org/jira/browse/IMPALA-6140 > Project: IMPALA > Issue Type: Bug > Components: Distributed Exec > Affects Versions: Impala 2.10.0 > Reporter: Tim Armstrong > Priority: Major > Labels: profile > > In the query timeline below there is a significant delay before rows are > available. > {noformat} > Query Timeline > Query submitted: 305.17us (305173) > Planning finished: 81ms (81195593) > Submit for admission: 82ms (82781362) > Completed admission: 83ms (83014912) > Ready to start on 35 backends: 84ms (84726950) > All 35 execution backends (35 fragment instances) started: 327ms > (327067351) > Rows available: 1.0m (60347008871) > Unregister query: 7.5m (447851216220) > {noformat} > The exec summary doesn't have any evidence of slowness. I also looked at the > rest of the profile and couldn't find any timers > 5s. > {noformat} > Operator #Hosts Avg Time Max Time #Rows Est. #Rows Peak Mem > Est. Peak Mem Detail > ------------------------------------------------------------------------------------------------------------------ > 03:AGGREGATE 1 0.000ns 0.000ns 0 1 148.00 KB > 10.00 MB FINALIZE > 02:EXCHANGE 1 474.937ms 474.937ms 33 1 0 > 0 UNPARTITIONED > 01:AGGREGATE 34 64.749ms 453.860ms 33 1 1.24 MB > 10.00 MB > 00:SCAN HDFS 34 1s391ms 5s736ms 987.15K 12.96B 82.19 MB > 176.00 MB db.table > {noformat} > One interesting data point is that we have anecdotal evidence that there were > orphaned query fragments sending reports on this cluster. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org