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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