qupeng

> This PR is so big @lonng It has been split into 3 PRs now. Line of code reduces from 4K to 2.5K now. I guess it can be reviewed...

/run-leak-test /run-verify

/run-all-tests

/run-verify

/run-leak-test

There are lots of log about "delete data in range because of stale", which is implemented with `delete_files_in_range`. I guess it's a known problem.How about running the test without dropping...

I guess it can be closed now?

/close

/remove-label affects-6.0

/remove-label affects-6.1