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https://issues.apache.org/jira/browse/GIRAPH-227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404875#comment-13404875
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Eli Reisman commented on GIRAPH-227:
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Fantastic, thanks! I will! I just posted a fix using Text as values in
GIRAPH-228 that works fine, but perhaps I could make an example vertex using
ArayListWritable as <E> value to show people how to make them work, and to
demonstrate that Giraph already supports multi graphs. Are there any easy
multigraph algorithms I could implement to give us a demo for the codebase?
Then we get 2 useful code examples for the price of one!
> ArrayWritables and their sub-classes don't play well with GiraphJob.run()
> -------------------------------------------------------------------------
>
> Key: GIRAPH-227
> URL: https://issues.apache.org/jira/browse/GIRAPH-227
> 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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