Eli Reisman created GIRAPH-227:
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Summary: 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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