Zipkin start和redis start兼容性问题

• Spring boot 版本: 2.2.1.RELEASE
• Spring cloud 版本 : Hoxton.RC1

项目中同时使用了

• spring-cloud-starter-zipkin
• spring-boot-starter-data-redis

<dependency>
    <groupId>org.springframework.cloudgroupId>
    <artifactId>spring-cloud-starter-zipkinartifactId>
dependency>
<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-data-redisartifactId>
dependency>

在编码中有多个Service同时注入了RedisTemplate redisTemplate导致在Tomcat启动时报错，导致无法运行。

错误如下

[ main] o.a.c.loader.WebappClassLoaderBase : The web application
[ROOT] appears to have started a thread named [lettuce-eventExecutorLoop-1-1] but has failed to stop it. This is very likely to create a memory leak.
Stack trace of thread:
sun.misc.Unsafe.park(Native Method)`

…

Caused by: org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis; nested exception is io.lettuce.core.RedisException: Cannot retrieve initial cluster partitions from initial URIs [RedisURI [host=‘172.31.214.234’, port=6380], RedisURI [host=‘172.31.214.234’, port=6381], RedisURI [host=‘172.31.214.235’, port=6380], RedisURI [host=‘172.31.214.235’, port=6381], RedisURI [host=‘172.31.214.236’, port=6380], RedisURI [host=‘172.31.214.236’, port=6381]

最终原因是Redis 客户端lettuce无法连接上Redis导致该报错。

解决

移除spring-boot-starter-data-redis中对lettuce的引用，加入jedis的依赖。

<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-data-redisartifactId>
    <exclusions>
        <exclusion>
            <groupId>io.lettucegroupId>
            <artifactId>lettuce-coreartifactId>
        exclusion>
    exclusions>
dependency>
<dependency>
    <groupId>redis.clientsgroupId>
    <artifactId>jedisartifactId>
dependency>

当我移除spring-cloud-starter-zipkin 之后再次启动项目发现启动成功，spring-boot-starter-data-redis默认使用lettuce作为Redis的客户端，因此推断为spring-cloud-starter-zipkin 可能和lettuce有兼容性问题。

因此尝试把lettuce换为jedis，问题解决。

参考

[1]. 简书 . heichong . Spring boot - data-redis与jedis关系. https://www.jianshu.com/p/c7b4cd47ad65