Ryan-Git

For mysql, even in RC isolation level, perform replace on table with unique index has a big chance to generate dead lock. We have to support update sql engine in...

MySQL2TiDB better support gh-ost

2

TiDB supports online schema change natively while MySQL often leverages tools like gh-ost. For task syncing from MySQL to TiDB, we'd better come up with a solution. @xialuo1990 could you...

There are some use cases where parsing binlog is the bottleneck, such as syncing from severals hours/days ago after dumping big uninterested table. Throughput is around 40 to 50 thousands...

this closes #251

support gh-ost & pt-osc in DDL execution.

the mysql_replace engine's performance of huge transaction full of deletions(e.g. delete * from big_table) is bad (on our sandbox TiDB cluster, 5k row/sec with 200 connections) .