On 25 Jan 2012, at 12:06, Bela Ban wrote:
>
>
> On 1/25/12 12:58 PM, Mircea Markus wrote:
>>
>> On 25 Jan 2012, at 09:42, Bela Ban wrote:
>>
>>>
>>>
>>> On 1/25/12 9:51 AM, Dan Berindei wrote:
>>>
>>>> Slightly related, I wonder if Manik's comment is still true:
>>>>
>>>> if at all possible, try not to use JGroups' ANYCAST for now.
>>>> Multiple (parallel) UNICASTs are much faster.)
>>>>
>>>> Intuitively it shouldn't be true, unicasts+FutureCollator do basically
>>>> the same thing as anycast+GroupRequest.
>>>
>>>
>>> No, parallel unicasts will be faster, as an anycast to A,B,C sends the
>>> unicasts sequentially
>> Thanks, very good to know that.
>>
>> I'm a a bit confused by the jgroups terminology though :-)
>> My understanding of the term ANYCAST is that the message is sent to *one* of
>> the A,B,C. But from what I read here it is sent to A, B and C - that's what
>> I know as MULTICAST.
>
>
> No, here's the definition:
> * anycast: message sent to a subset S of members N. The message is sent
> to all members in S as sequential unicasts. S <= N
> * multicast: cluster-wide message, sent to all members N of a cluster.
> This can be done via UDP (IP multicast) or TCP
> * IP multicast: the network level datagram packet with a class D address
> as destination
> * broadcast: IP packet sent to all hosts on a given range same host,
> subnet or higher)
Thanks for the clarification Bela. I've been using wikipedia[1] as a reference
and the terms have a slightly different meaning there.
[1] http://en.wikipedia.org/wiki/Anycast#Addressing_methodologies
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