FrankChen021 opened a new pull request #9898:
URL: https://github.com/apache/druid/pull/9898


   ### Description
   
   Aliyun is the 3rd largest cloud infrastructure provider in the world, and 
the 1st in China. It provides its own storage solution known as OSS (Object 
Storage Service), which is very similar to Amazon S3 from the client interface 
perspective view.
   
   To support Aliyun OSS as a choice of deep storage is meaningful. It could 
enrich the ecosystem of druid, and could draw attentions of so many Aliyun 
customers.
   
   Because the interfaces between Amazon S3 and Aliyun OSS are very similar, 
the code in this PR is based on that of s3 extensions.
   
   I've tested this extensions in test environment based on 0.18.1 branch for 
several days, including ingestion/compact/kill segments, index task loges. All 
data are stored/retrieved/deleted successfully.
   
   <hr>
   
   This PR has:
   - [X] been self-reviewed.
      - [ ] using the [concurrency 
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
 (Remove this item if the PR doesn't have any relation to concurrency.)
   - [X] added documentation for new or modified features or behaviors.
   - [ ] added Javadocs for most classes and all non-trivial methods. Linked 
related entities via Javadoc links.
   - [ ] added or updated version, license, or notice information in 
[licenses.yaml](https://github.com/apache/druid/blob/master/licenses.yaml)
   - [ ] added comments explaining the "why" and the intent of the code 
wherever would not be obvious for an unfamiliar reader.
   - [X] added unit tests or modified existing tests to cover new code paths.
   - [ ] added integration tests.
   - [X] been tested in a test Druid cluster.
   
   <!-- Check the items by putting "x" in the brackets for the done things. Not 
all of these items apply to every PR. Remove the items which are not done or 
not relevant to the PR. None of the items from the checklist above are strictly 
necessary, but it would be very helpful if you at least self-review the PR. -->


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