title: What are the unusable scenarios of TDengine?
body: <p>I was testing the brain split brain issue of TDengine these days with different configurations which prevents me from continuing to deploy cluster. In order to reduce the possibility of encountering bottlenecks, the unusable scenarios of TDengine are necessary to declare in advance. So I want to know what situation will cause the TDengine cluster core dump or unavailable except split brain or master selection failure? How can TDengine cluster effectively ensure high availability?</p>