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From Jun Rao <jun...@gmail.com>
Subject Re: Guarantees
Date Sat, 14 Jul 2012 18:32:38 GMT
The pipeline is supposed to recover from the network outage. There could be
bugs, especially in the ZK-based producer since it's relatively new.

Thanks,

Jun

On Thu, Jul 12, 2012 at 7:08 PM, graham sanderson <graham@vast.com> wrote:

> Hi, so I happened to be going to demo a prototype built with kafka in a
> borrowed large room which I discovered had insufficient/flaky wireless. Was
> using zookeeper config, and getting lots of timeouts etc. Since this was
> the first time I had used kafka and I hadn't done any off path testing, my
> first course of action was to find a hard wire, which I did and all the
> timeouts disappeared. The demo was great. Note that even with the flaky
> wireless, messages generally still seemed to be getting delivered, but not
> always as far as I could tell (or perhaps with high latency - was more
> focused on having a working demo than debugging)
>
> I'm using 0.7 atm, though I'm not sure if that matters.
>
> My somewhat question is, given a simple scenario using kafka/zookeeper
> (prior to all the exciting fault tolerance work going on right now):
>
> 1) Lets say I have zookeeper server, kafka server, producer, and consumer
> running on a perfect network. And I successfully send a message from
> producer to consumer
> 2) All JVMs stay up, however I lose network connectivity between some or
> all of them for some time
> 3) The network becomes perfect again.
> 4) I wait for some time for everyone to reconnect/re-negociate to their
> best ability
>
> Following that, should I expect a new message from the producer to reach
> the consumer, or can the system get into a broken state?… I swear I saw
> such a message not delivered, but I can't say for sure… I can certainly
> investigate further by trying to reproduce again and wading thru the many
> logged errors, but if someone already knows the answer that'd be awesome!
>
> Thanks,
>
> Graham.
>
>

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