store/copr: support retry for mpp query (#26462)

[ti-srebot]

cherry-pick #26462 to release-5.1
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/26480

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/26480:release-5.1-8db91a082ccc

---

What problem does this PR solve?

Problem Summary:
In production enviroument, we have sometimes observed that grpc server refuse to serve even though the server replies the IsAlive successfully. This only happens when we kill TiFlash forcely and restart it again. The unsteady time is usually short and TiFlash will serve normal after tens of seconds. We have to introduce a retry mechanism to work it around.

What is changed and how it works?

What's Changed:
We will retry MPPDispatch and MPPEstablishConnection requests after meeting i/o error, util the max backoff time has been reached.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

• store/copr: support retry for mpp query

[ti-srebot]

/run-all-tests

[ti-srebot]

@hanfei1991 you're already a collaborator in bot's repo.

[fzhedu]

/LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• fzhedu
• lysu

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[fzhedu]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 9d83390

[zhouqiang-cl]

/merge

[ti-chi-bot]

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