obj storage: optimize azure reader

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #56606

Problem Summary:

What changed and how does it work?

replace open reader on every read by open reader once and read

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

read one 250M file, before 17s, after 395ms

• No need to test

  • I checked and no code files have been changed.

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @D3Hunter. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 41 lines in your changes missing coverage. Please review.

Project coverage is 57.0563%. Comparing base (0fca61c) to head (c63efc8).
Report is 16 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56852         +/-   ##
=================================================
- Coverage   73.3131%   57.0563%   -16.2568%     
=================================================
  Files          1636       1786        +150     
  Lines        453635     640498     +186863     
=================================================
+ Hits         332574     365445      +32871     
- Misses       100683     249937     +149254     
- Partials      20378      25116       +4738     

Flag	Coverage Δ
integration	39.3712% <0.0000%> (?)
unit	72.5032% <0.0000%> (-0.0184%)	⬇️

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

Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	63.0887% <0.0000%> (+17.0465%)	⬆️

[GMHDBJD]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: GMHDBJD, lance6716

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Needs approval from an approver in each of these files:

• br/pkg/storage/OWNERS [GMHDBJD,lance6716]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-27 04:58:12.979307144 +0000 UTC m=+153005.818462689: ☑️ agreed by lance6716.
• 2024-10-27 05:55:04.25276754 +0000 UTC m=+156417.091923071: ☑️ agreed by GMHDBJD.

[D3Hunter]

/cherry-pick release-8.1-20241024-v8.1.1

[ti-chi-bot]

@D3Hunter: new pull request created to branch release-8.1-20241024-v8.1.1: #56853.

In response to this:

/cherry-pick release-8.1-20241024-v8.1.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #56938.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #56940.