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From "Philip O'Toole" <phi...@loggly.com>
Subject Re: storing last processed offset, recovery of failed message processing etc.
Date Mon, 09 Dec 2013 20:31:52 GMT
We use Zookeeper, as is standard with Kafka.

Our systems are idempotent, so we only store offsets when the message is
fully processed. If this means we occasionally replay a message due to some
corner-case, or simply a restart, it doesn't matter.


On Mon, Dec 9, 2013 at 12:28 PM, S Ahmed <sahmed1020@gmail.com> wrote:

> I was hoping people could comment on how they handle the following
> scenerios:
> 1. Storing the last successfully processed messageId/Offset.  Are people
> using mysql, redis, etc.?  What are the tradeoffs here?
> 2. How do you handle recovering from an error while processesing a given
> event?
> There are various scenerioes for #2, like:
> 1. Do you mark the start of processing a message somewhere, and then update
> the status to complete and THEN update the last messaged processed for #1?
> 2. Do you only mark the status as complete, and not the start of processing
> it?  I guess this depends of there are intermediate steps and processing
> the entire message again would result in some duplicated work right?

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