[Fedora-directory-users] multi-master limit
Enrico M. V. Fasanelli
Enrico.M.V.Fasanelli at le.infn.it
Wed Dec 5 22:14:04 UTC 2007
Dear Rich,
can you explain with some numbers on that?
How much RAM I need per each separate thread? How many replication
agreement in a server equipped with 2, 4, 8, 16 GB RAM?
How the avg. update rate influence these numbers? And the max update rate?
30 replication agreement per server is a medium value? large? huge? Too
much? Out of any hardware configuration?
Thank in advance.
Ciao,
Enrico
Rich Megginson wrote:
> Also important to keep in mind is your update rate - avg. updates per
> minute, max. updates per minute.
[...snips...]
> In Fedora DS, replication is supplier initiated, and will update as soon
> as possible by default. That is, as soon as the supplier receives the
> change, it will send it to the consumer. There are also programmatic
> ways to do it, but you usually don't need to.
[...snips...]
>> That means 4 is the highest number of masters we've tested
>> exhaustively. The protocol supports up to 2^32-2 masters, but you will
>> usually hit a practical limit in the number of replication
>> agreements. Each repl. agreement runs a separate thread, so you will
>> usually be
>> constrained by resources - available RAM, processors, etc.
[...snips...]
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