[Bug] 当并发创建会话时，EngineRef判断当前引擎数量为空时，会不会导致并发创建引擎？ #1951
Description
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Describe the bug
当并发创建会话时，EngineRef判断当前引擎数量为空时，会不会导致并发创建引擎？
getServerHost(zkClient, engineSpace).getOrElse {
create(zkClient, extraEngineLog)
}
这段代码在并发上是不是有问题？
Affects Version(s)
1.5.0
Kyuubi Server Log Output
No response
Kyuubi Engine Log Output
No response
Kyuubi Server Configurations
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Kyuubi Engine Configurations
No response
Additional context
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Are you willing to submit PR?
- Yes I am willing to submit a PR!