swamirishi commented on PR #7988:
URL: https://github.com/apache/ozone/pull/7988#issuecomment-2866488435
@ivanandikashopee Amongst the snapshot operation GetSnapshotInfo,
ListSnapshots, ListSnapshotDiffJobs are relatively lightweight operations and
only SnapshotDiff is actually an expensive operation. I don't really like the
idea of client dictating which OM should run the snapshotDiff operation. The
leader should dictate this. The leader can perform the following operation on
each and every snapshot diff operation:
1. Client asks leader to run a snapshot diff operation.
2. Let us add a command like CheckSnapshotDiif command on OM with request
and response of the following structure.
```
Request :
volumeName
bucketName
sourceSnapshot
targetSnapshot
Response:
omEndpoint
totalNumberOfSnapshotDiffOpsInQueue(optional) // only to be returned
when running on follower
hasOp (true if the snapshot diff is already in progress or results
are already computed)
snapshotsExists(true if both source and target snapshot exist
otherwise false)[Snapshots need not have been created on the follower]
```
This operation when run on leader where the leader figures out if it has
already computed snapshot diff in it's own local system if yes then returns
it's own endpoint as the response. Otherwise the leader should hit the same
command on the follower where it checks if any of the followers has done
performed this operation which as a response should also return the total
number of snapshotDiff operations in the follower's own queue.
If the snapshot diff is already being computed in some node then the leader
can just return the endpoint of the follower. Otherwise based on the
totalNumberOfSnapshotDiffOpsInQueue in the responses sent by the followers the
leader can just load balance the snapshot diff operation and return the om
endpoint where this operation is supposed to run.
3. Now given that the client has the endpoint, it can run the snapshotDiff
command on the particular endpoint and can poll the particular om for the
snapshot diff result.
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