Master Slave Replication, time between synch

[Salvatore Aurnia]

I use replication mechanism to have a living master through sentinel, but I do not care data synchronization between master and slave. Can I disable it? Can I set the interval between two sync?

I can use diskless replication and set repl-diskless-sync-delay to a large number to avoid it. Is it correct?

Thanks.

[The Real Bill]

That isn't how replication works in Redis. Once a slave is synced to its master the master will be streaming all changes to data as they happen. The flat parameter you mentioned has to do with multiple slaves to the same master. Redis does not periodically sync data, it does it at time of change.

You might want to revisit your setup and requirements. If you don't care about having current data, then don't use master and slave replication. Instead just copy over or pull down the RDB from the master and then start the wholly independent Redis server with that RDB. Just be sure to stop the server before copying in the new file.

[Salvatore Aurnia]

I have to have an active master and to use "Sentinel" to promote a
slave to master in case of problems. Through sentinel with a script I
can configure clients to use new master.

2016-09-16 18:09 GMT+02:00 The Real Bill <ucn...@gmail.com>:
> That isn't how replication works in Redis. Once a slave is synced to its master the master will be streaming all changes to data as they happen. The flat parameter you mentioned has to do with multiple slaves to the same master. Redis does not periodically sync data, it does it at time of change.
>
> You might want to revisit your setup and requirements. If you don't care about having current data, then don't use master and slave replication. Instead just copy over or pull down the RDB from the master and then start the wholly independent Redis server with that RDB. Just be sure to stop the server before copying in the new file.
>

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[Bill Anderson]

Sure, but the that nothing to do with “delaying" replication. In fact, you don’t want replication to be anything but current when using sentinel. You don’t want your slave to be behind because you didn’t think it necessary to keep it current. Replication in Redis happens as changes are made. This is exactly what you want: an up-to-date slave, not one which has old data. If you had that you would lose comparatively a lot of data on a failover.

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