w41ter opened a new pull request, #45061:
URL: https://github.com/apache/doris/pull/45061

   ### What problem does this PR solve?
   
   Issue Number: close #xxx
   
   Related PR: #xxx
   
   Problem Summary:
   
   
   Downloading small files is too slow and might cause the clone tablet task to 
time out. This PR supports a batch downloading API to speed up the downloading 
of small files.
   
   Before
   
   ```
   succeed to copy tablet 10088, total file size: 19256126 B, cost: 78674 ms, 
rate: 0.244758 MB/s
   ```
   
   After
   
   ```
   succeed to copy tablet 30157, total files: 20006, total file size: 19311624 
B, cost: 4016 ms, rate: 4.80867 MB/s
   ```
   
   ### Release note
   
   None
   
   ### Check List (For Author)
   
   - Test <!-- At least one of them must be included. -->
       - [ ] Regression test
       - [x] Unit Test
       - [ ] Manual test (add detailed scripts or steps below)
       - [ ] No need to test or manual test. Explain why:
           - [ ] This is a refactor/code format and no logic has been changed.
           - [x] Previous test can cover this change.
           - [ ] No code files have been changed.
           - [ ] Other reason <!-- Add your reason?  -->
   
   - Behavior changed:
       - [x] No.
       - [ ] Yes. <!-- Explain the behavior change -->
   
   - Does this need documentation?
       - [x] No.
       - [ ] Yes. <!-- Add document PR link here. eg: 
https://github.com/apache/doris-website/pull/1214 -->
   
   ### Check List (For Reviewer who merge this PR)
   
   - [ ] Confirm the release note
   - [ ] Confirm test cases
   - [ ] Confirm document
   - [ ] Add branch pick label <!-- Add branch pick label that this PR should 
merge into -->
   
   


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