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From "Josh Wills (JIRA)" <>
Subject [jira] [Commented] (CRUNCH-278) Improvements to MapsideJoin code
Date Thu, 10 Oct 2013 19:21:42 GMT


Josh Wills commented on CRUNCH-278:

Roger on the additional docs for ReadableSourceBundle.

Your assessment of where I was thinking of taking it is correct. My thought was that doing
it might require an API change to to take a TaskInputOutputContext
(or something similar) so that the DoFns that were contained in the ReadableSourceBundle could
have a proper setContext/initialize performed before they were called: what do you think of
having the more complex API available now, even if we don't actually set it up to use the
DoFns (which I agree w/you on: it will have some additional complexity involved to make it
work correctly.)

> Improvements to MapsideJoin code
> --------------------------------
>                 Key: CRUNCH-278
>                 URL:
>             Project: Crunch
>          Issue Type: Bug
>          Components: Core, MapReduce Patterns
>            Reporter: Josh Wills
>            Assignee: Josh Wills
>         Attachments: CRUNCH-278.patch
> The fact that we have special-case code in the MapsideJoinStrategy for the in-memory
and MR-based Pipeline instances has always bugged me, so I set out to eliminate the distinction
between the two impls by creating a new interface, ReadableSourceBundle<T>, that encapsulates
the MR and in-memory specific logic for doing mapside joins in order to remove the special-case
code in MapsideJoinStrategy and hopefully make other implementations that use our mapside-join
patterns much easier to test.

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