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https://issues.apache.org/jira/browse/FLINK-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Metzger updated FLINK-2396:
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Component/s: (was: Core)
Runtime / Operators
> Review the datasets of dynamic path and static path in iteration.
> -----------------------------------------------------------------
>
> Key: FLINK-2396
> URL: https://issues.apache.org/jira/browse/FLINK-2396
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Operators
> Reporter: Chengxiang Li
> Assignee: Chengxiang Li
> Priority: Major
>
> Currently Flink would cached dataset in static path as it assumes that
> dataset stay the same during the iteration, but this assumption does not
> always be true. Take sampling for example, the iteration data set is
> something like the weight vector of model and there is another training
> dataset from which to take a small sample to update the weight vector in each
> iteration (e.g. Stochastic Gradient Descent), we expect sampled dataset is
> different in each iteration, but Flink would cache the sampled dataset as it
> in static path.
> We should review how Flink identify dynamic path and static path, and support
> add sampled dataset in above example to dynamic path.
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