[opt](scanner) Control the degree of parallelism of scanner when only limit involved #39927
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Thank you for your contribution to Apache Doris. Since 2024-03-18, the Document has been moved to doris-website. |
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clang-tidy review says "All clean, LGTM! 👍" |
yiguolei
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Aug 26, 2024
yiguolei
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Aug 26, 2024
yiguolei
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yiguolei
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Aug 27, 2024
| description = { | ||
| "请使用 adaptive_pipeline_task_serial_read_on_limit", | ||
| "Please use adaptive_pipeline_task_serial_read_on_limit"}) | ||
| public long limitRowsForSingleInstance = 8192; |
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保持原来的值，10000就行了，万一有一些极限情况，上线后，直接性能下降了
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FE BE上参数不一样，都改成10000？
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run buildall |
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clang-tidy review says "All clean, LGTM! 👍" |
zhiqiang-hhhh
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clang-tidy review says "All clean, LGTM! 👍" |
TPC-H: Total hot run time: 38150 ms |
TPC-DS: Total hot run time: 193246 ms |
ClickBench: Total hot run time: 31.16 s |
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run buildall |
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clang-tidy review says "All clean, LGTM! 👍" |
TPC-H: Total hot run time: 38335 ms |
TPC-DS: Total hot run time: 193613 ms |
ClickBench: Total hot run time: 31.93 s |
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run buildall |
TPC-H: Total hot run time: 38507 ms |
TPC-DS: Total hot run time: 193612 ms |
ClickBench: Total hot run time: 32.91 s |
ClickBench: Total hot run time: 32.77 s |
yiguolei
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Sep 4, 2024
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… limit involved (apache#39927) For queries like `select * from tbl limit 100;`, we should limit the parallelism to 1. We already have strategies in our code, but we can not control its behavior. So add session variables to control them. Previous pr like apache#33888 apache#36535 already has done something similar, this pr integrates them.
This was referenced Oct 8, 2024
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Oct 9, 2024
enable_scan_node_run_serial is not working after #39927
eldenmoon
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Oct 10, 2024
enable_scan_node_run_serial is not working after apache#39927
cjj2010
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Oct 12, 2024
enable_scan_node_run_serial is not working after apache#39927
amorynan
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Oct 12, 2024
enable_scan_node_run_serial is not working after apache#39927
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Oct 16, 2024
# Versions - [x] dev - [x] 3.0 - [x] 2.1 - [ ] 2.0 # Languages - [x] Chinese - [x] English apache/doris#39927
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enable_scan_node_run_serial is not working after apache#39927
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… limit involved (apache#39927) For queries like `select * from tbl limit 100;`, we should limit the parallelism to 1. We already have strategies in our code, but we can not control its behavior. So add session variables to control them. Previous pr like apache#33888 apache#36535 already has done something similar, this pr integrates them.
yiguolei
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Oct 19, 2024
… limit involved (apache#39927) For queries like `select * from tbl limit 100;`, we should limit the parallelism to 1. We already have strategies in our code, but we can not control its behavior. So add session variables to control them. Previous pr like apache#33888 apache#36535 already has done something similar, this pr integrates them.
zhiqiang-hhhh
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Nov 8, 2024
… limit involved (apache#39927) For queries like `select * from tbl limit 100;`, we should limit the parallelism to 1. We already have strategies in our code, but we can not control its behavior. So add session variables to control them. Previous pr like apache#33888 apache#36535 already has done something similar, this pr integrates them.
zhiqiang-hhhh
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enable_scan_node_run_serial is not working after apache#39927
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zhiqiang-hhhh
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Dec 27, 2024
Related PR: apache#39927 apache#39927 introduced a new session var `adaptive_pipeline_task_serial_read_on_limit`, its implementation has flaw, reduce scanner parallelism should only happen when there is not conjunction. Since we can not estimate the filtration efficiency.
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Dec 27, 2024
Related PR: apache#39927 apache#39927 introduced a new session var `adaptive_pipeline_task_serial_read_on_limit`, its implementation has flaw, reduce scanner parallelism should only happen when there is not conjunction. Since we can not estimate the filtration efficiency.
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Jan 1, 2025
enable_scan_node_run_serial is not working after apache#39927
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For queries like
select * from tbl limit 100;, we should limit the parallelism to 1.We already have strategies in our code, but we can not control its behavior. So add session variables to control them.
Previous pr like #33888 #36535 already has done something similar, this pr integrates them.