hyc@symas.com wrote:

Michael Ströder wrote:

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hyc@symas.com wrote:

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Generating a new contextCSN at startup is of questionable worth. We discussed this a bit 'way back in 2004 http://www.openldap.org/lists/openldap-devel/200408/msg00035.html Perhaps we should just not do it;

+1

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if a single-master provider starts up empty and a consumer tries to talk to it and both have an empty cookie, the provider should just respond "you're up to date".

Why not return an error to the consumer?

Typically if a consumer receives an error it will disconnect and retry later. There's not much point making the consumer reconnect - which may be costly for a TCP session. If it's a refreshAndPersist consumer, it just needs to hang on and wait for some real data to arrive.

Is the cost really that high compared to the rest of the initialization?

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Does the provider know whether it's running as single-master?

Generally yes. A single-master setup has serverID=0.

Hmm, this introduces more semantics on serverID. I have some doubts about corner-cases.

Maybe I misunderstood but IMO the issue was about changing a provider to a MMR replica which would need serverID!=0 anyway.

Ciao, Michael.