Shuo-Jia opened a new issue #892:
URL: https://github.com/apache/incubator-pegasus/issues/892
## Feature Request
Duplication has some shortcoming：
- **It depends remote filesystem to sync the checkpoint:**
It leads to complexity in use, which make you have to support HDFS
or FDS, and must start duplicate in three steps: update checkpoint in master,
restore checkpoint in follower and start sync plog data in master.
- **The synchronization of plog data only sends a single mutation at each
RPC:**
The rate of sync is slow and cause the plog pile up in sometimes.
The issue request will hope enhance it:
- Use `learn` to replace `backup-restore` to sync checkpoint
- Use `batch-send` to replace `single-send` to sync plog
- Connect the above two processes to automate them, and the establishment of
duplication can be completed with one command
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