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New Features
Support forwarding requests in a network partition environment #3431
Support using joint consensus to change region members and enhance the availability #2860
Improvements
Reduce the redundant scheduling issues caused by fluctuations of node capacity (always near the waterline) and caused by PD's store-limit configuration value set too large. This is achieved by introducing a new set of scheduling calculation formulas enabled via the region-score-formula-version = v2 configuration item. #3269
Enable the cross-Region merge feature by modifying enable-cross-table-merge = true to reduce the number of empty Regions. #3129
Improve the performance of checking scheduling constraints and the performance of fixing the unhealthy Regions in a large cluster #3155
Reduce the heartbeat overhead when cluster exist many pending-peers or down-peers change #3462
Reduce the unnecessary balance about the empty regions #3344
Bug Fixes
Fix the bug that the isolation level is wrong when the store lacks the label #3474
Fix the bug that pd can not replicate region after deployed #3516
Fix the bug that gets TSO cannot work well in a network partition environment #3501
Fix the bug that the isolation level is wrong when the store lacks label #3474
Fix the bug that the regions in split-cache are becoming the target of merge #3454
