yangzhg opened a new issue #8095: URL: https://github.com/apache/incubator-doris/issues/8095
### Search before asking - [X] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues. ### Description Since OlapScanNode calculates the number of scanners per tablet based on the scan range, https://github.com/apache/incubator-doris/blob/143c4085ee58007954f3eef8910556f5b8ce6b39/be/src/exec/olap_scan_node.cpp#L771 when the query conditions are few, the number of scanners for the tablet may be too large, and when calculating the amount of data scanned by each scanner in the next step, it will be use `scanners_per_tablet` as the denominator, https://github.com/apache/incubator-doris/blob/143c4085ee58007954f3eef8910556f5b8ce6b39/be/src/exec/olap_scan_node.cpp#L786 so each scanner scans only a small amount of data. The total number of scanners is roughly the number of scan ranges multiplied by the number of conds in each range, which will result in a large number of scanners scanning a small amount of data at the same time. ### Solution Consider the tablet size when calculating scanners_per_tablet, no more scanners are generated for small tablets ### Are you willing to submit PR? - [X] Yes I am willing to submit a PR! ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
