RedisTemplate执行lua脚本在Redis集群模式下报错EvalSha is not supported in cluster environment.

RedisTemplate执行lua脚本在Redis集群模式下报错EvalSha is not supported in cluster environment.

异常信息：

org.springframework.dao.InvalidDataAccessApiUsageException: EvalSha is not supported in cluster environment.
        at org.springframework.data.redis.connection.jedis.JedisClusterScriptingCommands.evalSha(JedisClusterScriptingCommands.java:83) ~[spring-data-redis-2.1.8.RELEASE.jar:2.1.8.RELEASE]
        at org.springframework.data.redis.connection.DefaultedRedisConnection.evalSha(DefaultedRedisConnection.java:1318) ~[spring-data-redis-2.1.8.RELEASE.jar:2.1.8.RELEASE]
        at org.springframework.data.redis.connection.DefaultStringRedisConnection.evalSha(DefaultStringRedisConnection.java:1729) ~[spring-data-redis-2.1.8.RELEASE.jar:2.1.8.RELEASE]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181]
        at org.springframework.data.redis.core.CloseSuppressingInvocationHandler.invoke(CloseSuppressingInvocationHandler.java:61) ~[spring-data-redis-2.1.8.RELEASE.jar:2.1.8.RELEASE]
        at com.sun.proxy.$Proxy196.evalSha(Unknown Source) ~[?:?]

执行方法，集群下报错：

public boolean unlock(String key, String value) {
    Long result = template.execute(redisScript, Arrays.asList(key),Arrays.asList(value));
    return RELEASE_SUCCESS.equals(result);
}

解决方案

原因：spring自带的执行脚本方法中，集群模式直接抛出不支持执行脚本的异常，所以只能拿到原redis的connection来执行脚本。

public boolean unlock(String key, String value) {
        //使用Lua脚本：先判断是否是自己设置的锁，再执行删除
        // 使用lua脚本删除redis中匹配value的key，可以避免由于方法执行时间过长而redis锁自动过期失效的时候误删其他线程的锁
        // spring自带的执行脚本方法中，集群模式直接抛出不支持执行脚本的异常，所以只能拿到原redis的connection来执行脚本

        List<String> keys = new ArrayList<>();
        keys.add(key);
        List<String> args = new ArrayList<>();
        args.add(value);

        Long result = template.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                Object nativeConnection = connection.getNativeConnection();
                // 集群模式和单机模式虽然执行脚本的方法一样，但是没有共同的接口，所以只能分开执行
                // 集群模式
                if (nativeConnection instanceof JedisCluster) {
                    return (Long) ((JedisCluster) nativeConnection).eval(UNLOCK_LUA, keys, args);
                }

                // 单机模式
                else if (nativeConnection instanceof Jedis) {
                    return (Long) ((Jedis) nativeConnection).eval(UNLOCK_LUA, keys, args);
                }
                return 0L;
            }
        });

        //返回最终结果
        return RELEASE_SUCCESS.equals(result);
    }

参考文档：

https://my.oschina.net/dengfuwei/blog/1600681