Release v0.6.0

⭐ New Features

• [Feature]: Add membership change mechanism for CUPR consensus Protocol (Read design doc #306 for more details)
• [Feature]: Implement cluster server and client #464, #465
• [Feature]: Implement the graceful shutdown feature.
• [Feature]: Implement the xlinctl to communicate with the xline cluster. Currently, the xlinectl covers functionalities:
  • Compaction and member command: Implemented in pr #484
  • Txn, watch and lock command: Implemented in pr #428
  • Role command: Implemented in pr #427
  • User command: Implemented in pr #426
  • Snapshot and auth command: Implemented in pr #425
  • Delete and lease command: Implemented in pr #424

🪲 Bug Fixes

• [Bug]: benchmark client cannot connect to server #462
• [Bug]: remove stop in simulation tests #458
• [Bug]: execute out of order #454
• [Bug]: check the password on leader #435
• [Bug]: remove recovery of uncommitted pool #419
• [Bug]: CURP TLA+ quorum size calculation & property check #418
• [Bug]: fix propose doesn't handle SyncedError #407

🛠️ Refactor

• [Refactor]: reduce code duplication #407
• [Refactor]: Take into account the interleaving states of a request broadcast in TLA+ #429
• [Refactor]: Refine the bench client implementation #496
• [Refactor]: Simplified the error handling logic #480
• [Refactor]: Improve readability of bootstrap errors #432
• [Refactor]: Imporve command serialization in execution and after-sync #421, #422

❤️ Contributors

• @EAimTY
• @MarkGaox
• @Kikkon

Note：
Known issue: If the cluster is shut down immediately after adding a member, the leader node may not shut down properly, continuously trying to send entries to the shut-down new node. Read issue #526 for more details.