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From Alex Karasulu <>
Subject Re: Replication heads-up
Date Sat, 30 Jul 2011 10:50:45 GMT
Thanks for the update!


On Fri, Jul 29, 2011 at 7:40 PM, Emmanuel Lecharny <> wrote:
> Hi guys,
> we are working with Kiran to test replication thoroughly. So far, it's going
> pretty well.
> We have fixed a couple of potential race conditions, and it seems that the
> initial update is pretty much covered :
> * one producer is loaded with 1000 entries
>  - a consumer is correctly getting those 1000 entries
>  - a consumer gets the 1000 entries, then one entry is added on the
> producer, and it gets replicated into the consumer
>  - a consumer gets around 200 entries before being brutally stopped, then
> restarted, and gets back the 1000 entries
>  - 4 consumers are started altogether, and are correctly updated
> What is missing is a test where the provider is brutally stopped in the
> middle of the replication, then restarted, to see if the consumer correctly
> reconnect to get back the missing entries.
> The next steps will be to see what's going on with multiple operations
> (delete/move/rename/modify/moveAndRename) when having multiple consumers.
> Kiran alrady added the tests for those operations, and they work.
> One thing that could be done later would be to build a scenario where we
> load a server with some random data, and apply some random operations on it
> (add/delete/move/rename/modify+moveAndRename), with more than one consumer
> connected to it, and after some time (say, one or two days), check that the
> consumers and the provider are all in sync. That would be something we
> should run on a separate platform, because it would be totally overkilling
> if done as tests. I'll see with Apache infra if we can use some of the
> servers they have.
> The next step will be to implement the MMR mode (right now, we only have
> MSR), which means the producer will also be a consumer. That also implies we
> implement the conflict resolution engine.
> Thanks !
> --
> Regards,
> Cordialement,
> Emmanuel Lécharny

Best Regards,
-- Alex

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