nathanlo-hrt opened a new pull request, #3015:
URL: https://github.com/apache/kvrocks/pull/3015

   Currently `CommandExec` will try and call `CommitTxn` even if the write 
batch is empty. Also, RocksDB will reject write batch commits on read-only DBs 
even if they're empty.
   
   This means that MULTI/EXEC transactions silently fail:
   ```
   MULTI 
   +OK
   GET a
   +QUEUED
   EXEC
   *1
   -ERR Not implemented: Not supported operation in read only mode.
   ```
   
   With my change, this will succeed on read-only DBs.
   ```
   MULTI
   +OK
   GET a
   +QUEUED
   EXEC
   *1
   $1
   b
   ```
   and the usual read-only permission checking will still work properly.
   ```
   MULTI
   +OK
   SET a b
   +QUEUED
   EXEC
   *1
   -ERR Not implemented: Not supported operation in read only mode.
   ```


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