playground: exit faster

[nexustar]

What problem does this PR solve?

• fix Inccorect results of cluster_info/cluster_config memtables #1894

What is changed and how it works?

Check List

Tests

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

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• AstroProfundis

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[codecov-commenter]

Codecov Report

Merging #1893 (8650fa6) into master (47d9f8b) will decrease coverage by 10.36%.
The diff coverage is 61.29%.

❗ Current head 8650fa6 differs from pull request most recent head 449ec51. Consider uploading reports for the commit 449ec51 to get more accurate results

@@             Coverage Diff             @@
##           master    #1893       +/-   ##
===========================================
- Coverage   52.13%   41.78%   -10.36%     
===========================================
  Files         307      306        -1     
  Lines       35387    35376       -11     
===========================================
- Hits        18448    14779     -3669     
- Misses      14751    18611     +3860     
+ Partials     2188     1986      -202     

Flag	Coverage Δ
cluster	32.13% <ø> (-8.39%)	⬇️
tiup	14.45% <ø> (+0.09%)	⬆️
unittest	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/playground/main.go	45.44% <16.67%> (ø)
components/playground/playground.go	49.59% <72.00%> (ø)
components/dm/ansible/worker.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/meta/err.go	0.00% <0.00%> (-76.19%)	⬇️
pkg/cluster/api/error.go	0.00% <0.00%> (-75.00%)	⬇️
pkg/crypto/rand/passwd.go	0.00% <0.00%> (-75.00%)	⬇️
pkg/cluster/operation/systemd.go	0.00% <0.00%> (-75.00%)	⬇️
pkg/telemetry/node_info.go	0.00% <0.00%> (-70.73%)	⬇️
pkg/cluster/manager/check.go	0.67% <0.00%> (-68.12%)	⬇️
pkg/cluster/task/limits.go	0.00% <0.00%> (-65.22%)	⬇️
... and 110 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 47d9f8b...449ec51. Read the comment docs.

[AstroProfundis]

will it be possible to remain as zombie process if it hangs on kill?

[nexustar]

Entire terminate function are in a goroutine and there are another wait goroutine.

[AstroProfundis]

/merge

[ti-chi-bot]

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

Commit hash: 449ec51