Get Data From Redis in batch RedisTemplate

Question

I am using RedisTemplate in my spring boot application and I am able to read using singleKey.

String valueJson = (String) redisTemplate.opsForValue().get(setKey(someId));

I have now a List of "someId" like "List someIds" and I want to get the data of all Ids. Of course I can iterate on the list and hit redis with indivisual keys, but I dont want that, instead I want provide the whole list to get the response in one go.

Please help.

Depending on the underlying data type, there are bulk commands like MGET, HMGET to read multiple keys (strings) or entries from a hash. Otherwise, like Thomas wrote, use pipelining to issue multiple commands and synchronize at the end. — mp911de
– mp911de, Commented Feb 1, 2017 at 15:53

Thomas Lehoux · Accepted Answer · 2017-02-01 09:30:47Z

12

You need to use pipelining: https://redis.io/topics/pipelining

List<Object> results = redisTemplate.executePipelined(
  new RedisCallback<Object>() {
    public Object doInRedis(RedisConnection connection) throws DataAccessException {
      StringRedisConnection stringRedisConn = (StringRedisConnection)connection;
      for(String id:someIds) 
        stringRedisConn.get(id);

    return null;
  }
});

Or in Java 8:

List<Object> results = redisTemplate.executePipelined((RedisCallback<Object>) connection -> {
    StringRedisConnection stringRedisConn = (StringRedisConnection) connection;

    someIds.forEach(id -> {
        stringRedisConn.get(id);
    });

    return null;
});

The results List will contain all that you want.

answered Feb 1, 2017 at 9:30

Thomas Lehoux

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1 Comment

wst Over a year ago

Worth to not that, at the moment (ver 2.9.0), while trying to execute pipelined with a cluster, Jedis will throw: UnsupportedOperationException: Pipeline is currently not supported for JedisClusterConnection.

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