Spring Boot Redis Cluster 实战干货

添加配置信息

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spring.redis:
database: 0 # Redis数据库索引(默认为0)
#host: 192.168.1.8
#port: 6379
password: 123456
timeout: 10000 # 连接超时时间(毫秒)
pool:
max-active: 8 # 连接池最大连接数(使用负值表示没有限制)
max-idle: 8 # 连接池中的最大空闲连接
max-wait: -1 # 连接池最大阻塞等待时间(使用负值表示没有限制)
min-idle: 0 # 连接池中的最小空闲连接
cluster:
nodes:
- 192.168.1.8:9001
- 192.168.1.8:9002
- 192.168.1.8:9003

只需要添加3个master节点,3个slave节点不需要添加。

你要做的也只有这些配置了,其他的spring boot都自动配置好了。

现在就可以像使用单机一样使用集群,redis会自动按key分片到不同的集群实例。

遇到的问题

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Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
at redis.clients.util.Pool.getResource(Pool.java:53)
at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226)
at redis.clients.jedis.JedisSlotBasedConnectionHandler.getConnectionFromSlot(JedisSlotBasedConnectionHandler.java:66)
at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:116)
at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:141)
at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:141)
at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:141)
at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:141)
at redis.clients.jedis.JedisClusterCommand.runBinary(JedisClusterCommand.java:60)
at redis.clients.jedis.BinaryJedisCluster.set(BinaryJedisCluster.java:77)
at org.springframework.data.redis.connection.jedis.JedisClusterConnection.set(JedisClusterConnection.java:618)
... 36 more
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused: connect
at redis.clients.jedis.Connection.connect(Connection.java:207)
at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767)
at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106)
at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868)
at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)
at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
at redis.clients.util.Pool.getResource(Pool.java:49)
... 46 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at redis.clients.jedis.Connection.connect(Connection.java:184)
... 53 more

尝试往redis写数据的时候,报不能获取连接异常,跟踪了半天代码,发现连接的是127.0.0.1,而不是配置的192.168.1.8,这就奇怪了,继续跟踪代码发现是往redis服务器获取的返回的集群实例列表,真是坑!

image

源码:

redis.clients.jedis.Jedis#clusterSlots

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@Override
public List<Object> clusterSlots() {
checkIsInMultiOrPipeline();
client.clusterSlots();
return client.getObjectMultiBulkReply();
}

就是这里获取返回的集群列表,返回的就是127.0.0.1,而不是配置的192.168.1.8。

最后修改各个集群节点的配置文件redis.conf,添加:

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bind 192.168.1.8

重启集群节点之后,读写正常。