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From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-90) Object reuse is not accounted for in mapper fusion
Date Sat, 06 Oct 2012 12:43:03 GMT
Gabriel Reid created CRUNCH-90:
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             Summary: 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


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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