Ruanhui

Results 13 issues of Ruanhui

This PR introduces a ScanRangeOptimizer to try to reduce unnecessary reading of data based on filters user set. For example, if user want to scan data where rowkey > 'hhh'...

**This PR tries to reimplement the log-roll procedure with proc-v2.** **Modifies the following things** **client side:** when request all rs to roll WAL writers, instead of calling `admin.execProcedure()`, now we...