licl2014 removed a comment on issue #8445: In DirectDruidClient, Future cancellation listener shouldn't run in HTTP library thread URL: https://github.com/apache/incubator-druid/issues/8445#issuecomment-532655119 I also have a problem about `cancel query`, the scenario is as follows: 1. I execute a big query which will runs 1 minute .the timeout is default 5 minutes, after it runs 3 second, we cancel it through `curl -X DELETE "http://broker:8082/druid/v2/queryid"` and it will be canceled success and all historical nodes will cancel it success too. 2. but if it runs more than 10 secnods , after we cancel it with the DELETE API, we find the query will be canceled ,but not all historical nodes cancel it too. for 2, because `futures` control `segment query`, so can't be canceled in `Merging`
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