api/java/src/main/java/com/navercorp/redis/cluster/spring/DefaultSessionOfHashListOperations.java
public Set<HK> keys(H key, HK field) {
        final byte[] rawKey = rawKey(key);
        final byte[] rawHashKey = rawHashKey(field);

        Set<byte[]> rawElementNames = execute(new RedisCallback<Set<byte[]>>() {
            public Set<byte[]> doInRedis(RedisConnection connection) throws DataAccessException {
                return ((RedisClusterConnection) connection).slKeys(rawKey, rawHashKey);
            }
        }, true);

        return deserializeHashKeys(rawElementNames);
    }
public Set<HK> keys(H key, HK field) {
        final byte[] rawKey = rawKey(key);
        final byte[] rawHashKey = rawHashKey(field);

        Set<byte[]> rawElementNames = execute(new RedisCallback<Set<byte[]>>() {
            public Set<byte[]> doInRedis(RedisConnection connection) throws DataAccessException {
                return ((RedisClusterConnection) connection).slKeys(rawKey, rawHashKey);
            }
        }, true);

        return deserializeHashKeys(rawElementNames);
    }
/*
@see SessionOfHashListOperations#keys(java.lang.Object, java.lang.Object)