GitHub user lhotari added a comment to the discussion: Replacing Apache JClouds 
with Apache OpenDAL in the tiered-storage module

It seems that Hadoop Cloud Storage could be a Java based alternative. The 
abstraction is the Hadoop FileSystem abstraction:
https://hadoop.apache.org/docs/current/api/org/apache/hadoop/fs/FileSystem.html

There are multiple implementations of the abstraction. It's not only S3, Azure 
and GCS, but many others.
* S3: 
https://hadoop.apache.org/docs/current/api/org/apache/hadoop/fs/s3native/NativeS3FileSystem.html
* GCS: https://issues.apache.org/jira/browse/HADOOP-19343 ([will be released in 
3.5.0 very 
soon](https://lists.apache.org/thread/4ro2lhqtt6zwg77lfmgkmqkjtkr5x5vk))
* Azure: 
https://hadoop.apache.org/docs/current/api/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystemStore.html

The 3.5.0 release will improve how the cloud storage modules are distributed: 
https://issues.apache.org/jira/browse/HADOOP-19696

GitHub link: 
https://github.com/apache/pulsar/discussions/25093#discussioncomment-15297365

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