Replication and re-sharding of keys

[Simone Mosciatti]

Hi all,

I have a doubts about what happens in case of replication.

I haven't understood the semantic start/stop/step of RM_CreateCommand, that believe it is related to replication but I am not sure at all.

Also, suppose I am able to distribute my values on a redis cluster, what happens in case of re-sharding (a node, enter/leave the cluster and some key must move) ?
What function is called in order to move a custom key from one node to another?

Cheers,

Simone

[Dvir Volk]

If you create a custom data type, you should provide serialization and de-serialization callbacks for RDB. They are also used for migrating keys. In your case this probably means a full dump or load of the entire sqlite database. 

Re replication - you should use command based replication in your case, using RedisModule_Replicate or RedisModule_ReplicateVerbatim. 

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[Simone Mosciatti]

Hi Dvir,

Thanks, it completely makes sense and it's perfectly reasonable.

Thank you again :)

Cheers

Simone

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Da: Dvir Volk
Inviato: ‎18/‎12/‎2016 11:01
A: Simone Mosciatti; redis-module-devs
Oggetto: Re: Replication and re-sharding of keys