[jira] [Commented] (SAMZA-252) Document stream reprocessing

["Chris Riccomini (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SAMZA-252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14026527#comment-14026527 ] 

Chris Riccomini commented on SAMZA-252:
---------------------------------------

I think we should bring this ticket into 0.7.0 as well. It's pretty much done. [~martinkl], are you blocked on anything from us?

> Document stream reprocessing
> ----------------------------
>
>                 Key: SAMZA-252
>                 URL: https://issues.apache.org/jira/browse/SAMZA-252
>             Project: Samza
>          Issue Type: Improvement
>          Components: docs
>    Affects Versions: 0.6.0
>            Reporter: Chris Riccomini
>            Assignee: Martin Kleppmann
>             Fix For: 0.7.0, 0.8.0
>
>         Attachments: SAMZA-252.1.patch
>
>
> A need with stream processing is to want to re-process prior messages at some later date. An example of this is having a stream processing job that is classifying messages in some way using a machine learning algorithm. At some point, the algorithm will be updated with a more accurate vector of weights. When this happens, usually you wish to re-process past messages to get more accurate results. Usually this is solved by running a parallel pipeline from Hadoop.
> We have thought extensively about this use case, and should document how to use Samza in a re-processing use case.



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