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https://issues.apache.org/jira/browse/BEAM-6756?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on BEAM-6756 started by Shehzaad Nakhoda.
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> Support lazy iterables in schemas
> ---------------------------------
>
>                 Key: BEAM-6756
>                 URL: https://issues.apache.org/jira/browse/BEAM-6756
>             Project: Beam
>          Issue Type: Sub-task
>          Components: sdk-java-core
>            Reporter: Reuven Lax
>            Assignee: Shehzaad Nakhoda
>            Priority: Major
>
> The iterables returned by GroupByKey and CoGroupByKey are lazy; this allows a 
> runner to page data into memory if the full iterable is too large. We 
> currently don't support this in Schemas, so the Schema Group and CoGroup 
> transforms materialize all data into memory. We should add support for this.



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