pingcap / pingcap/tiflash

execution summary may error

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Dominant language
C++
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Description

[2021/09/11 08:44:23.553 +08:00] [ERROR] [select_result.go:299] ["invalid cop task execution summaries length"] [conn=1049623] [expected=26] [received=19]
[2021/09/11 08:44:23.592 +08:00] [ERROR] [select_result.go:299] ["invalid cop task execution summaries length"] [conn=1049623] [expected=26] [received=19]
[2021/09/11 08:44:23.596 +08:00] [ERROR] [select_result.go:299] ["invalid cop task execution summaries length"] [conn=1049623] [expected=26] [received=19]
[2021/09/11 08:44:23.599 +08:00] [ERROR] [select_result.go:299] ["invalid cop task execution summaries length"] [conn=1049623] [expected=26] [received=19]
[2021/09/11 08:44:23.604 +08:00] [ERROR] [select_result.go:299] ["invalid cop task execution summaries length"] [conn=1049623] [expected=26] [received=19]
[2021/09/11 08:44:23.608 +08:00] [ERROR] [select_result.go:299] ["invalid cop task execution summaries length"] [conn=1049623] [expected=26] [received=19]
[2021/09/11 08:44:23.609 +08:00] [ERROR] [select_result.go:299] ["invalid cop task execution summaries length"] [conn=1049623] [expected=26] [received=19]

in another user, the execution summary on tidb is also not right.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start at select_result.go:299, where the invalid cop task execution summaries length error is reported, and compare the expected and received counts in the provided logs. Trace how execution summaries are produced and consumed between TiFlash and TiDB; done means the summary is correct and the length error no longer occurs.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
databases
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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