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From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CRUNCH-90) Object reuse is not accounted for in mapper fusion
Date Sat, 06 Oct 2012 12:45:02 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-90?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gabriel Reid updated CRUNCH-90:
-------------------------------

    Attachment: CRUNCH-90.patch

Patch to fix the issue, as well as tests that demonstrate it. If there are no objections,
I'll commit this shortly.
                
> 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
>         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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