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From "Eli Reisman (JIRA)" <>
Subject [jira] [Commented] (GIRAPH-227) ArrayWritables and their sub-classes don't play well with
Date Sun, 01 Jul 2012 03:34:58 GMT


Eli Reisman commented on GIRAPH-227:

If I have missed something here, perhaps a JIRA to get someone more experienced to put up
a practice example or vertex showing best practices for using ArrayWritables successfully
with Giraph is in order. Again, my concern is without this, Giraph will not support multigraph
type <E> edge values so, basically no multigraph support without heavier code chages/API
changes. This seems unneeded when Hadoop already has ArrayWritable right there for us to use.
Has anyone tried them on Giraph and just not submitted a patch yet?


> ArrayWritables and their sub-classes don't play well with
> -------------------------------------------------------------------------
>                 Key: GIRAPH-227
>                 URL:
>             Project: Giraph
>          Issue Type: Bug
>          Components: graph, test
>    Affects Versions: 0.2.0
>            Reporter: Eli Reisman
>             Fix For: 0.2.0
> Twice now (GIRAPH-157 and GIRAPH-217) I have attempted to implement vertices that use
ArrayWritables (including subclassing as described in Hadoop docs, and the generic String[]
version with its own constructor). Although the code will compile and compute() can successfully
be unit tested, a real run breaks the code. Thanks to Sean Choi (also struggling with this)
for helping me figure out I'm not crazy, this is a real issue.
> A guick grep in Giraph reveals no one else is using them yet, so maybe thats why this
has gotten past us thus far. I am happy to take a hard look at GiraphJob (etc) and see if
i can figure a workaround, but this one might be above my pay grade. Help!
> Incidently, I used Sean's solution in 157 to simple output final data tuples as Text
vertex values, but this is wasteful and not good for bulk data processing. Could be something
about our output formats, but between us we have attempted several with no dice. If I have
just been a newbie and missed something, please let me know, otherwise I'm going to change
GIRAPH-217 to use Text output as well, and fix it again later when this issue is resolved.
> Thanks for your help!

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