lightning: make pre-check output message clearer (#30439)

[ti-srebot]

cherry-pick #30439 to release-5.3
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/30888

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

git push [email protected]:ti-srebot/tidb.git pr/30888:release-5.3-eb6c89d6d404

---

What problem does this PR solve?

Issue Number: close #30395

Problem Summary:

What is changed and how it works?

• make tidb-lightning storage size check output message clearer
• Only write the critical message into error message

The check result is adjusted as follow:

local disk space may not enough to finish import, estimate sorted data size is 249.5GiB, but local available is 58.35GiB, please set `tikv-importer.disk-quota` to a smaller value than 58.35GiB or change `mydumper.sorted-kv-dir` to another disk with enough space to finish imports

Return error change:

tidb lightning encountered error:  tidb-lightning pre-check failed: local disk space may not enough to finish import, estimate sorted data size is 249.5GiB, but local available is 58.35GiB, please set `tikv-importer.disk-quota` to a smaller value than 58.35GiB or change `mydumper.sorted-kv-dir` to another disk with enough space to finish imports

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

make tidb-lightning pre-check output message clearer

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• kennytm
• lichunzhu

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[ti-srebot]

/run-all-tests

[ti-srebot]

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

[sleepymole]

need fix imports

[lichunzhu]

LGTM

[lichunzhu]

/merge

[ti-chi-bot]

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

Commit hash: 61fb532

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

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[lichunzhu]

/run-check_dev