错误描述：在访问高峰期的时候，kylin会挂掉，查看日志如下，但不知道如何操作，请问能帮我看一下吗。这个问题已经困扰很久了。
日志：
严重: The web application [/kylin] created a ThreadLocal with key of type
[java.lang.ThreadLocal] (value [java.lang.ThreadLocal@6cc63032]) and a value of
type [org.apache.kylin.rest.msg.Message] (value
[org.apache.kylin.rest.msg.Message@3ad18e2f]) but failed to remove it when the
web application was stopped. Threads are going to be renewed over time to try
and avoid a probable memory leak.
三月 01, 2019 9:50:52 上午 org.apache.catalina.loader.WebappClassLoaderBase
checkThreadLocalMapForLeaks
严重: The web application [/kylin] created a ThreadLocal with key of type
[java.lang.ThreadLocal] (value [java.lang.ThreadLocal@76397470]) and a value of
type [org.apache.kylin.common.util.ImplementationSwitch] (value
[org.apache.kylin.common.util.ImplementationSwitch@26f33af5]) but failed to
remove it when the web application was stopped. Threads are going to be renewed
over time to try and avoid a probable memory leak.
三月 01, 2019 9:50:52 上午 org.apache.coyote.AbstractProtocol stop
信息: Stopping ProtocolHandler ["http-bio-7070"]
三月 01, 2019 9:50:52 上午 org.apache.coyote.AbstractProtocol stop
信息: Stopping ProtocolHandler ["ajp-bio-9009"]
