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From Boris Yen <yulin...@gmail.com>
Subject Re: Efficiency of Cross Data Center Replication...?
Date Sun, 20 Nov 2011 12:01:45 GMT
A quick question, what if DC2 is down, and after a while it comes back on.
how does the data get sync to DC2 in this case? (assume hint is disable)

Thanks in advance.

On Thu, Nov 17, 2011 at 10:46 AM, Jeremiah Jordan <
jeremiah.jordan@morningstar.com> wrote:

> Pretty sure data is sent to the coordinating node in DC2 at the same time
> it is sent to replicas in DC1, so I would think 10's of milliseconds after
> the transport time to DC2.
>
> On Nov 16, 2011, at 3:48 PM, ehershey@gmail.com wrote:
>
> On a related note - assuming there are available resources across the
> board (cpu and memory on every node, low network latency, non-saturated
> nics/circuits/disks), what's a reasonable expectation for timing on
> replication? Sub-second? Less than five seconds?
>
> Ernie
>
> On Wed, Nov 16, 2011 at 4:00 PM, Brian Fleming <bigbrianfleming@gmail.com>wrote:
>
>> Great - thanks Jake
>>
>> B.
>>
>> On Wed, Nov 16, 2011 at 8:40 PM, Jake Luciani <jakers@gmail.com> wrote:
>>
>>> the former
>>>
>>>
>>> On Wed, Nov 16, 2011 at 3:33 PM, Brian Fleming <
>>> bigbrianfleming@gmail.com> wrote:
>>>
>>>>
>>>> Hi All,
>>>>
>>>> I have a question about inter-data centre replication : if you have 2
>>>> Data Centers, each with a local RF of 2 (i.e. total RF of 4) and write to
a
>>>> node in DC1, how efficient is the replication to DC2 - i.e. is that data
:
>>>>  - replicated over to a single node in DC2 once and internally
>>>> replicated
>>>>  or
>>>>  - replicated explicitly to two separate nodes?
>>>>
>>>> Obviously from a LAN resource utilisation perspective, the former would
>>>> be preferable.
>>>>
>>>> Many thanks,
>>>>
>>>> Brian
>>>>
>>>>
>>>
>>>
>>> --
>>> http://twitter.com/tjake
>>>
>>
>>
>
>

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