I think this can be implemented more easily by specifying the value ttl in the redis map

See this pattern

The problem is we are using hash in this case and TTL is normally applied on the key and not on the fields, I will dig further to see if there is any way to achieve this for a filed in a key

here is a thread saying its not possible
https://stackoverflow.com/questions/16545321/how-to-expire-the-hset-child-key-in-redis

There is this PR that implemented expiration on hashes
redis/redis#13172
its available on version 7.2

What's preventing expiring the key ?

This is the key in our case

This is field:

see here:

I think solution 1 here, would make the trick

I think solution 1 here, would make the trick

I caanot access this

TLDR;

Set the TTL on the entire hash map key:

HINCRBY myhash field 1
EXPIRE myhash 60  # Set TTL of 60 seconds on the entire hash map

Essentially an inc followed by an expire operation

Actually this should be done only for *day* metrics, therefore the ones having /d/<date> in the key

There is this method for expiry. but it still only required key and not field

What's wrong with that?

What's wrong with that?

ok you are correct, if i use expiry it does work
I will develop it using this

@pditommaso I have added two test failing and success to show why expire with key wont work, because we need to evict the field in a key and not the whole key, i am using 1 second as ttl

failing test:

success test: where everything will be null

the problem is we are using redis hash, where we have to fields, key and field
expirying key does not help our use case

Considering this is not critical. I'd say to park until Redis 7.2 is available, so that we can use expired on the field

Hash expiration functionality will be available in jedis 5.2.0
https://github.com/redis/jedis/releases/tag/v5.2.0-beta4
and required redis 7.4

Hash expiration functionality has been added, but the jedis dependency is still in beta, once the final version is released. I will make this pr ready for review

Redis v 5.2.0 has been released
https://github.com/redis/jedis/releases/tag/v5.2.0

Now this PR needs Redis 7.4 or later