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Posted to issues@systemml.apache.org by "Mike Dusenberry (JIRA)" <ji...@apache.org> on 2016/09/11 00:37:20 UTC

[jira] [Updated] (SYSTEMML-906) Use of `df.first` in MLContextUtil is a Bottleneck

     [ https://issues.apache.org/jira/browse/SYSTEMML-906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mike Dusenberry updated SYSTEMML-906:
-------------------------------------
    Summary: Use of `df.first` in MLContextUtil is a Bottleneck  (was: Use of `df.first` in MLContext is a Bottleneck)

> Use of `df.first` in MLContextUtil is a Bottleneck
> --------------------------------------------------
>
>                 Key: SYSTEMML-906
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-906
>             Project: SystemML
>          Issue Type: Improvement
>            Reporter: Mike Dusenberry
>
> The use of {{dataframe.first()}} at {{MLContextUtil.java:497}} causes a severe bottleneck if the input DataFrame is a lazy result of a compute-intensive chain.  We should change this to use {{dataframe.schema}}, and then iterate over the types in the schema.
> cc [~deron]



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