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From "Avery Ching (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (GIRAPH-112) Use elements() properly in LongDoubleFloatDoubleVertex
Date Thu, 22 Dec 2011 08:34:30 GMT

     [ https://issues.apache.org/jira/browse/GIRAPH-112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Avery Ching resolved GIRAPH-112.
--------------------------------

    Resolution: Fixed
      Assignee: Avery Ching

Thanks for the report and reviews.
                
> Use elements() properly in LongDoubleFloatDoubleVertex
> ------------------------------------------------------
>
>                 Key: GIRAPH-112
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-112
>             Project: Giraph
>          Issue Type: Bug
>          Components: graph
>    Affects Versions: 0.70.0
>         Environment: Any
>            Reporter: Yuanyuan Tian
>            Assignee: Avery Ching
>             Fix For: 0.70.0
>
>         Attachments: GIRAPH-112.patch
>
>   Original Estimate: 5m
>  Remaining Estimate: 5m
>
> I found a bug in LongDoubleFloatDoubleVertex.write(DataOutput out) when running a small
graph algorithm. The symptom is that a vertex read from a different worker becomes junk after
the RPC communication. And the source of the problem is the writing of the messages in LongDoubleFloatDoubleVertex.write(DataOutput
out):
> for(double msg : messageList.elements()) {
>    out.writeDouble(msg);
> }
> Here messageList.elements() will returns all the elements currently stored in the mahout
DoubleArrayList, even including invalid elements between size and capacity. Therefore, the
write() function will write a bunch of invalid messages, which will cause error when reading
them back in readfields().
> The following is a simple solution:
> double[] elements=messageList.elements();
> for(int i=0; i<messageList.size(); i++) {
>    out.writeDouble(elements[i]);
> }

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