Migrate incremental data via parsing and filtering data

[tisonkun]

Report https://github.com/apache/incubator-kvrocks/runs/7034653085?check_suite_focus=true#step:10:687

[git-hulk]

This test case spent almost 30s on my local machine and it should be even slower in CI environment. So we can increase the wait time from 50s => 100s if has no idea. Do guys
have any thoughts about this case? @ChrisZMF @ShooterIT @caipengbo

[tisonkun]

It's a valid workaround. However, it's better to make the waiting determinately - is it possible?

[git-hulk]

It's a valid workaround. However, it's better to make the waiting determinately - is it possible?

Yes, can check the migrate finished status which we're doing at line: slotmigrate.tcl#L513, we can remove the time limit.

[git-hulk]

@tisonkun removed the time limit, can help to take a look again.

[caipengbo]

Is there any way we can reduce the waiting time?  I think this test case is taking too long.

[git-hulk]

Maybe we can test whether increase the pipeline size can help or not