Hemant Kumar created HDDS-7952:
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             Summary: Change Snapdiff API response  
                 Key: HDDS-7952
                 URL: https://issues.apache.org/jira/browse/HDDS-7952
             Project: Apache Ozone
          Issue Type: Sub-task
            Reporter: Hemant Kumar


Snapshot diff API is synchronous API and diff report generation could long 
time. It is possible the client request timeout before diff report gets 
generated.

To solve this, client submits the request, we can spawn a background thread to 
generate the diff and return the client that job has been queued and wait for 
sometime before retrying.

For this, we need to add Job Status and wait time in the 
[SnapshotDiffResponse|https://github.com/apache/ozone/blob/6560e2f606879dfee82e3bdcc6f94b2e802b881a/hadoop-ozone/interface-client/src/main/proto/OmClientProtocol.proto#L1741]
 and set these when generating the response for it in *SnapshotDiffManager*.



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