Sometimes, the client need to locate non-continuous key ranges. Current PD has no good solution for this requirement.
There are 2 workaround:
Use GetRegion to load region one by one, check if the ranges are drained eachtime.
Use ScanRegion to load (ranges[0].start, ranges[len(ranges)-1].end), which can cause unexpected traffics (imagine the ranges[0] is the first row and ranges[len(ranges)-1] is the last row of a large table).
Thus a interface BatchScanRegions is required.
It returns multi regions like ScanRegion, but accept a key range slice parameters. The returned regions are guaranteed to cover the given ranges if limitation is not reached.
Development Task
Sometimes, the client need to locate non-continuous key ranges. Current PD has no good solution for this requirement.
There are 2 workaround:
GetRegionto load region one by one, check if the ranges are drained eachtime.ScanRegionto load(ranges[0].start, ranges[len(ranges)-1].end), which can cause unexpected traffics (imagine the ranges[0] is the first row and ranges[len(ranges)-1] is the last row of a large table).Thus a interface
BatchScanRegionsis required.It returns multi regions like
ScanRegion, but accept a key range slice parameters. The returned regions are guaranteed to cover the given ranges if limitation is not reached.