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https://issues.apache.org/jira/browse/CRUNCH-315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13857929#comment-13857929
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Micah Whitacre commented on CRUNCH-315:
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I would assume it would have to be serialized to disk. Most of the time in our
cases where we've needed a collection like that since the data size is
typically a lot smaller we've done mapside joins or injected that in memory
collection into the DoFn with custom serialization logic if needed.
> Empty collection
> ----------------
>
> Key: CRUNCH-315
> URL: https://issues.apache.org/jira/browse/CRUNCH-315
> Project: Crunch
> Issue Type: New Feature
> Reporter: Chao Shi
> Attachments: CRUNCH-315.patch
>
>
> As discussed in the mailing list [1] and [2], I'd like to add an empty
> collection feature. On the API side, I think we can add a new method in
> Pipeline to create an empty collection. The collection should be a subclass
> of PCollection and behaves like other normal PCollecitons. There are also
> some optimization points that Josh mentioned in [2].
> I haven't thought it clearly. Just put a ticket here and see if anyone else
> has a better idea.
> [1]
> http://mail-archives.apache.org/mod_mbox/crunch-dev/201312.mbox/%3CBLU0-SMTP1337A04FAC6B5F497F7473EADC10%40phx.gbl%3E
> [2]
> http://mail-archives.apache.org/mod_mbox/crunch-dev/201312.mbox/%3CCAH29n6MbSK9gapoC2DgVnhofjAobyasCuZh_0475DuSajV%3DCPg%40mail.gmail.com%3E
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