[GitHub] [incubator-kvrocks] PragmaTwice commented on issue #315: Support Watch/Unwatch

["PragmaTwice (via GitHub)" <gi...@apache.org>]

PragmaTwice commented on issue #315:
URL: https://github.com/apache/incubator-kvrocks/issues/315#issuecomment-1442063019

   Consider some implemenation methods from scratch:
   
   **by snapshots:**
   It seems to be more "elegant", but is more heavy: make snapshots by each watched key many affect many details in rocksdb.
   And it has some different behavior than redis:
   ```
   set a 1
   watch a
   set a 1
   multi
   get a
   exec
   ```
   Redis will return nil, while the snapshot method will continue to execute this redis txn.
   
   **by command & key tracing:**
   It seems a little complicated but more clean and has more less influence on storage.
   
   I will try the second way these days, but maybe slow since I have lots of other things to do.
   
   @git-hulk @ShooterIT @caipengbo 


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