Could not get a resource from the pool； nested exception is io.lettuce.core.RedisConnectionException

记录一次redis连接报错：

Caused by: org.springframework.data.redis.connection.PoolException: Could not get a resource from the pool; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to 10.55.55.55:6379
	at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.getConnection(LettucePoolingConnectionProvider.java:109)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.getConnection(LettuceConnectionFactory.java:1417)
	... 60 common frames omitted
Caused by: io.lettuce.core.RedisConnectionException: Unable to connect to 10.16.10.82:32405
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:78)
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:56)
	at io.lettuce.core.AbstractRedisClient.getConnection(AbstractRedisClient.java:234)
	at io.lettuce.core.RedisClient.connect(RedisClient.java:207)
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.lambda$getConnection$1(StandaloneConnectionProvider.java:115)
	at java.util.Optional.orElseGet(Optional.java:267)
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.getConnection(StandaloneConnectionProvider.java:115)
	at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.lambda$null$0(LettucePoolingConnectionProvider.java:97)
	at io.lettuce.core.support.ConnectionPoolSupport$RedisPooledObjectFactory.create(ConnectionPoolSupport.java:209)
	at io.lettuce.core.support.ConnectionPoolSupport$RedisPooledObjectFactory.create(ConnectionPoolSupport.java:199)
	at org.apache.commons.pool2.basePooledObjectFactory.makeObject(basePooledObjectFactory.java:58)
	at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:889)
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:424)
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:349)
	at io.lettuce.core.support.ConnectionPoolSupport$1.borrowObject(ConnectionPoolSupport.java:122)
	at io.lettuce.core.support.ConnectionPoolSupport$1.borrowObject(ConnectionPoolSupport.java:117)
	at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.getConnection(LettucePoolingConnectionProvider.java:103)
	... 61 common frames omitted

看日志错误信息发现ip 端口等都没有问题，检查redis服务发现也是打开的。

只能再去检查项目配置文件，redis配置如下

spring:
    # redis 配置
    redis:
        # 地址
        host: 10.55.55.55
        # 端口，默认为6379
        port: 6379
        # 密码
        password: 
        # 连接超时时间
        timeout: 10
        lettuce:
            pool:
                # 连接池中的最小空闲连接
                min-idle: 0
                # 连接池中的最大空闲连接
                max-idle: 5
                # 连接池的最大数据库连接数
                max-active: 5
                # #连接池最大阻塞等待时间（使用负值表示没有限制）
                max-wait: -1

发现同事把timeout值设置的过小，timeout：10，应该是还没建立完连接就断开了。所以才会报Could not get a resource from the pool这个错误。

后来把该值修改3000，再次启动,成功！