[jira] [Commented] (CRUNCH-320) Materialize several PObject & PCollection objects in parallel (deferred materialization)

["Josh Wills (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CRUNCH-320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13864418#comment-13864418 ] 

Josh Wills commented on CRUNCH-320:
-----------------------------------

Is that not already the case? You can get a reference to the materialized collection (Iterable<T>) or the PObject, but we don't actually create it until you call iterator() on the Iterable<T> or getValue() on the PObject. You should be able to line up a bunch of materialized collections/PObjects, call run(), and then retrieve the materialized data immediately by calling iterator()/getValue() as appropriate.

> Materialize several PObject & PCollection objects in parallel (deferred materialization)
> ----------------------------------------------------------------------------------------
>
>                 Key: CRUNCH-320
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-320
>             Project: Crunch
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jason Gauci
>            Assignee: Josh Wills
>
> Currently, Crunch blocks and materializes PCollections (through foo.materialize()) and PObjects (through foo.getValue()) on demand, but it would be a significant performance improvement if we could mark several of these objects as to be materialized, and then materialize all of them in parallel as part of a pipeline.run() call.



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