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https://issues.apache.org/jira/browse/SYSTEMML-2155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-2155.
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Resolution: Fixed
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.1
> Recompute nnz on spark checkpoints for large matrices
> -----------------------------------------------------
>
> Key: SYSTEMML-2155
> URL: https://issues.apache.org/jira/browse/SYSTEMML-2155
> Project: SystemML
> Issue Type: Task
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Priority: Major
> Fix For: SystemML 1.1
>
>
> Operations over large matrices with dimensions > max integer, are always
> forced to spark which implies missing nnz information due to lazy evaluation
> in spark. This task aims to proactively recompute the nnz for such large
> matrices (which are often ultra-sparse) to improve size propagation during
> recompilation and repeated access.
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