Stephen O'Donnell created HDDS-5292:
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             Summary: Introduce WritableContainerInterface to SCM
                 Key: HDDS-5292
                 URL: https://issues.apache.org/jira/browse/HDDS-5292
             Project: Apache Ozone
          Issue Type: Improvement
          Components: SCM
            Reporter: Stephen O'Donnell
            Assignee: Stephen O'Donnell


When implementing EC, we need to allocate blocks to containers on EC pipelines 
as well as Ratis pipelines (the current code path). The class 
`BlockManager.allocateBlock(...)` currently does this work.

To allow EC implementation to progress more smoothly, I would like to have 
BlockManager user a new interface to obtain a container for a block, namely the 
WritableContainerProvider interface.

This change is just a refactor to add the interface. Existing functionality is 
unchanged.



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