[jira] [Created] (RATIS-1582) Add notify install snapshot finished event to trigger cleanup of snapshot

["Xu Shao Hong (Jira)" <ji...@apache.org>]

Xu Shao Hong created RATIS-1582:
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             Summary: Add notify install snapshot finished event to trigger cleanup of snapshot
                 Key: RATIS-1582
                 URL: https://issues.apache.org/jira/browse/RATIS-1582
             Project: Ratis
          Issue Type: Improvement
          Components: snapshot
            Reporter: Xu Shao Hong
            Assignee: Xu Shao Hong


Currently, the notify install snapshot would not inform when the whole progress is done

From the Ozone side, the statemachine's notifyInstallSnapshotFromLeader is a single request and process. It is fine before we find out that the installation of snapshot could get stuck due to the whole RocksDB replacement each time (the leader could have purged the raft log during transferring the snapshot and thus triggers another snapshot installation when the previous install request is done). To solve this, we come up with the incremental snapshot idea, which could transfer the incremental part of RocksDB in the next install request, and needs to preserve the checkpoints. 



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