最近线上服务器过一段时间时不时的就报redis连接失败，导致整个系统崩溃，这是什么原因呢？项目有使用netty
2022-08-13 22:55:47 [XNIO-1 task-5] ERROR io.undertow.request - UT005023: Exception handling request to /spotorder-system/ac/order/orderInfo/toSettleAccounts
org.redisson.client.RedisTimeoutException: Unable to acquire connection! RedissonPromise [promise=ImmediateEventExecutor$ImmediatePromise@23d9c994(failure: java.util.concurrent.CancellationException)]Increase connection pool size. Node source: NodeSource [slot=0, addr=null, redisClient=null, redirect=null, entry=null], command: (GET), params: [citylife-system:login_tokens:91ce1d28-65ec-49b1-9f7b-39014c5231fe] after 0 retry attempts
at org.redisson.command.RedisExecutor$2.run(RedisExecutor.java:187)
at io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:669)
at io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:744)
at io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:469)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)
