StackExchange.Redis: Batch access for multiple hashes

Question

So I need to access in bulk many different hashes (in StackExchange.Redis, I have different RedisKey's).

What is the best (fastest) way to do it? For example, for these two possible implementations, is either correct? Which one works better?

1.

List<Task<HashEntry[]>> list = new List<Task<HashEntry[]>>();
List<RedisKey> keys; //Previously initialized list of keys
foreach (var key in keys)
{
    var task = db.HashGetAllAsync(key);
    list.Add(task);
}
await Task.WhenAll(list);

List<Task<HashEntry[]>> list = new List<Task<HashEntry[]>>();
List<RedisKey> keys; //Previously initialized list of keys
IBatch batch = db.CreateBatch();
foreach (var key in keys)
{
    var task = batch.HashGetAllAsync(key);
    list.Add(task);
}
batch.Execute();

Marc Gravell · Accepted Answer · 2015-02-18 14:08:41Z

3

On performance: have you timed them?

Other than that: both work, and have different trade-offs; the latter is synchronous, for example - bit benefits from avoiding all of the TPL overheads and complications. You might also want to consider a third option - a Lua script that accepts and array of keys as input and invokes HGETALL for each.

answered Feb 18, 2015 at 14:08

Marc Gravell

1.1m273 gold badges2.6k silver badges3k bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Santiago Cerón Uribe Over a year ago

Hello. I tried the three of them ... oddly (for me) the winner (and sometimes by a large margin) was "pipelining" (calling HashGetAllAsync multiple times and awaiting). I say oddly because reading on the internet, Lua seemed to be a superior solution. Maybe I am using a bad script? I am using a similar script to the one posted here link.

Collectives™ on Stack Overflow

StackExchange.Redis: Batch access for multiple hashes

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related