Question ask: How to know the changefeed task is completed?

[mahjonp]

I'm going to bench the performance of CDC. I populate some data into the upstream TiDB cluster and after it's finished, I run cdc cli, and get some info like:

create changefeed detail &{SinkURI:root@tcp(127.0.0.1:3306)/test Opts:map[] CreateTime:2019-12-09 21:11:09.219849281 -0500 EST m=+0.017868850 StartTs:413114580074496000 TargetTs:0 Info:<nil>}

The sync task is running on cli server, so How do I know data is synced?

[amyangfei]

Add a ctrl command in #169
We can start a changefeed with a target-ts, and check the checkpoint-ts of replication status of this changefeed by

➜  ./bin/cdc ctrl --cmd=query-cf-status --changefeed-id=a2339fed-d360-4726-bd42-f2f0c08daa44
{"sink-uri":"root@tcp(127.0.0.1:3306)/test","resolved-ts":413128531400720385,"checkpoint-ts":413128528739696641}