Shao Hou Kun comments

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Shao Hou Kun

gh-ost may lose data when performing DDL on mysql with semi-sync replication enabled

https://github.com/github/gh-ost/pull/1054 No need to use lock. And add a heartbeat between the `addDMLEventsListener` and `ReadMigrationRangeValues` to fix this bug.

If MySQL two-phase commit is time-consuming, it will cause gh-ost to lose data.

👍

How to set the log file path?

我能说中文吗？ T.T，请问怎么打开日志文件呀？