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https://issues.apache.org/jira/browse/MAHOUT-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13673114#comment-13673114
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Robin Anil commented on MAHOUT-1238:
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Also I see test failures. Dont change the behavior of getNumNonDefaultElement,
instead try to correct the serialization code to write the correct size.
> VectorWritable's bug with VectorView of sparse vectors
> ------------------------------------------------------
>
> Key: MAHOUT-1238
> URL: https://issues.apache.org/jira/browse/MAHOUT-1238
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Affects Versions: 0.7, 0.8
> Reporter: Maysam Yabandeh
> Assignee: Robin Anil
> Labels: reduce, test
> Fix For: 0.7, 0.8
>
> Attachments: MAHOUT-1238.patch
>
>
> VectorWritable raises an exception if it is used on a VectorView of a sparse
> vector. The reason is that the sparse vector writes only the non-zero
> elements, while VectorView's implementation of getNumNondefaultElements()
> returns the size of the entire data. Later when reading the vector,
> VectorWritable expects reading more items that was written.
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