How to fix 'No way to dispatch this command to Redis Cluster because keys have different slots' in Spring - spring

Question

I need to use Redis Cluster in Spring. But I'm getting the following error when I use mget or del on a list of keys: 'No way to dispatch this command to Redis Cluster because keys have different slots'. Showing a part of my Component code using JedisCluster.
It works when I use single key operations but not with multiple keys.
/* Component Code */
public class RedisServiceManager {
#Value("${redis.hosts}")
String hosts;
#Autowired
JedisPoolConfig jedisPoolConfig;
private JedisCluster jedisCluster;
#PostConstruct
private void init() {
List<String> redisHosts = Arrays.asList(hosts.split(","));
Set<HostAndPort> jedisClusterNode = new HashSet<HostAndPort>();
redisHosts.forEach(redisHost -> {
jedisClusterNode.add(new HostAndPort(redisHost, 6379));
});
jedisCluster = new JedisCluster(jedisClusterNode, jedisPoolConfig);
}
// This works
public String getValueForKey(String key) {
try {
return jedisCluster.get(key);
} catch (Exception e) {
return null;
}
}
// This works
public void delKey(String cacheKey) {
try {
jedisCluster.del(cacheKey);
} catch (Exception e) {
}
}
// This doesn't work
public List<String> getValuesForAllKeys(String... keys) {
try {
return jedisCluster.mget(keys);
} catch (Exception e) {
return new ArrayList<>();
}
}
// This doesn't work
public void delAllKeys(String... keys) {
try {
jedisCluster.del(keys);
} catch (Exception e) {
}
}
}
Can someone help with this?

Answer 1

This is not a bug or an issue, but is the way how redis cluster works. You can find more details in the cluster documentation. But don't worry: there is a "trick": you can use hash as described here