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planner: log the reason why the sample-rate is chosen when analyzing table #45936

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qw4990 opened this issue Aug 9, 2023 · 0 comments · Fixed by #45938
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planner: log the reason why the sample-rate is chosen when analyzing table #45936

qw4990 opened this issue Aug 9, 2023 · 0 comments · Fixed by #45938
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affects-7.1 This bug affects the 7.1.x(LTS) versions. sig/planner SIG: Planner type/enhancement The issue or PR belongs to an enhancement.

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qw4990 commented Aug 9, 2023

Enhancement

The optimizer chose the wrong sample rate to analyze a big table and then caused TiDB OOM, but now we cannot know why this wrong sample rate is chosen from the log.
It's better to log the reason why the sample rate is chosen for this table when analyzing:
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@qw4990 qw4990 added type/enhancement The issue or PR belongs to an enhancement. sig/planner SIG: Planner labels Aug 9, 2023
@qw4990 qw4990 mentioned this issue Aug 9, 2023
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@qw4990 qw4990 added the affects-7.1 This bug affects the 7.1.x(LTS) versions. label Aug 10, 2023
ti-chi-bot bot pushed a commit that referenced this issue Aug 10, 2023
@qw4990
planner: log the reason why the sample-rate is chosen when analyzing …
6fb20c9 
…table (#45938)

close #45936
@ti-chi-bot ti-chi-bot mentioned this issue Aug 10, 2023
Merged
12 tasks
ti-chi-bot bot pushed a commit that referenced this issue Oct 16, 2023
@ti-chi-bot
planner: log the reason why the sample-rate is chosen when analyzing …
6de161e 
…table (#45938) (#45968)

close #45936
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affects-7.1 This bug affects the 7.1.x(LTS) versions. sig/planner SIG: Planner type/enhancement The issue or PR belongs to an enhancement.
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planner: log the reason why the sample-rate is chosen when analyzing table qw4990/tidb
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