How to write/override own key slot hashing algoritm in lettuce ?

[sagars...@gmail.com]

how to write/override own key slot hashing algoritm in lettuce?

I have 500 keys of which 100 keys's value is large in volume/size. Issue that I am facing is one of my 3 shard is utilizing 10 gb data and other 2 shards are using 1 gb each.

I want to  distrubute big size keys equally across shards for which I believe I need to override existing hashslot alogrithm.

Can someone help me how to do that?

[Mark Paluch]

This is not a Lettuce issue, this is a Cluster configuration/sharding issues. Redis requires the client to compute a slot hash and then clients determine a shard by the calculated slot hash. If the client would route a command to a different shard, then Redis rejects execution and redirects to the appropriate shard.

The only things to do are: Reconfigure your cluster or use slot hash tags enclosed in {…}. See Redis docs for further details.

Cheers, 

Mark

[Sagar Sitap]

Yup this is not Lettice issue. I want to know if there is a way by which slot hash calulation algorithm can be overriden in lettuce. 

As you said clients (lettuce in this case) determine a shard by the calculated slot hash, is there a way?

yeah I checked slot hash tags, it will make sure same hash tags keys will go in same shards but that will not solve my problem.

E.g. 

hash tags = "aa"  suppose there are 4 keys of each 10 mb data so 40 mb total goes in shard 1

hash tags = "bb" for this hash tag it is possible that redis end up putting keys in same shard as above.

please correct me if I am wrong

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Thanks,

Sagar Sitap