Details
Description
Now the scanner id is a long number from 1 to max in a region server. Each new scanner will have a scanner id.
If a client has a scanner whose id is x, when the RS restart and the scanner id is also incremented to x or a little larger, there will be a scanner id collision.
So the scanner id should now be same during each time the RS restart. We can add the start timestamp as the highest several bits in scanner id uint64.
And because HBASE-18121 is not easy to fix and there are many clients with old version. We can also encode server host:port into the scanner id.
So we can use ServerName.
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HBASE-18121 Scanner id should be reset when ScannerCallable reload the location
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