masteryhx opened a new pull request, #5172:
URL: https://github.com/apache/hadoop/pull/5172

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   ### Description of PR
   
   In our application, different components have their own suitable buffer size 
to download.
   
   But currently, AliyunOSSFileSystem#open(Path path, int bufferSize) just get 
downloadPartSize from configuration.
   
   We cannnot use different value for different components in our programs.
   
   I think we should the method should use the buffer size from the paramater.
   
   AliyunOSSFileSystem#open(Path path) could have default value as current 
default downloadPartSize.
   
   ### How was this patch tested?
   Added method TestAliyunOSSInputStream#testConfiguration to test.
   
   ### For code changes:
   
   - [ ] Does the title or this PR starts with the corresponding JIRA issue id 
(e.g. 'HADOOP-17799. Your PR title ...')?
   - [ ] Object storage: have the integration tests been executed and the 
endpoint declared according to the connector-specific documentation?
   - [ ] If adding new dependencies to the code, are these dependencies 
licensed in a way that is compatible for inclusion under [ASF 
2.0](http://www.apache.org/legal/resolved.html#category-a)?
   - [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`, 
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