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https://issues.apache.org/jira/browse/SPARK-20109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-20109.
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Resolution: Fixed
Fix Version/s: 2.3.0
Issue resolved by pull request 17459
[https://github.com/apache/spark/pull/17459]
> Need a way to convert from IndexedRowMatrix to Dense Block Matrices
> -------------------------------------------------------------------
>
> Key: SPARK-20109
> URL: https://issues.apache.org/jira/browse/SPARK-20109
> Project: Spark
> Issue Type: New Feature
> Components: MLlib
> Affects Versions: 2.1.0
> Reporter: John Compitello
> Priority: Minor
> Fix For: 2.3.0
>
>
> The current implementation of toBlockMatrix on IndexedRowMatrix is
> insufficient. It is implemented by first converting the IndexedRowMatrix to a
> CoordinateMatrix, then converting that CoordinateMatrix to a BlockMatrix. Not
> only is this slower than it needs to be, it also means that the created
> BlockMatrix ends up being backed by instances of SparseMatrix, which a user
> may not want. Users need an option to convert from IndexedRowMatrix to
> BlockMatrix that backs the BlockMatrix with local instances of DenseMatrix.
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