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https://issues.apache.org/jira/browse/CRUNCH-90?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471356#comment-13471356
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Josh Wills commented on CRUNCH-90:
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Will take a look this evening and see if I can come up with a fix.
> Object reuse is not accounted for in mapper fusion
> --------------------------------------------------
>
> Key: CRUNCH-90
> URL: https://issues.apache.org/jira/browse/CRUNCH-90
> Project: Crunch
> Issue Type: Bug
> Reporter: Gabriel Reid
> Assignee: Gabriel Reid
> Fix For: 0.4.0
>
> Attachments: CRUNCH-90.patch
>
>
> When multiple DoFns are run over the same output (i.e. in the case of mapper
> fusion), the same value object is passed to multiple underlying DoFns. If the
> state of that value object is changed by one DoFn, other DoFns are called
> with the updated object.
> This is a situation that can happen quite easily when the input of a DoFn is
> simply updated and then emitted. In general, this bug will only affect values
> whose type is the same as the underlying serialization type.
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