[rabbitmq-discuss] problem about flow control and HA cluster

[bupt bupt]

hello everyone,
        I have read official document of rabbitmq, But I still have some
problem, Could you help me:
1. Can you give me an example(internet address is ok) about how to finish
flow control if the length of queue is too big or if the used memory and
disc near the threshold. Can you give me some client code(python or Java)
to help me use it.
2. I have read document about how to set up rabbitmq cluster by"
http://www.rabbitmq.com/clustering.html" But who is master and who is
cluster, It  doesn't tell us. which broker manage all the nodes in cluster?
I didn't see any mirror queue in this address, Can this cluster still be HA
cluster?
3. Is every message has length and size limit? what is the maximum size of
every message?
Thank you very much!
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