Josh Wills created CRUNCH-437:
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Summary: Fix Crunch Spark duplicate value aggregation
Key: CRUNCH-437
URL: https://issues.apache.org/jira/browse/CRUNCH-437
Project: Crunch
Issue Type: Bug
Reporter: Josh Wills
The current Crunch-on-Spark mapside combiner uses a Multimap of key-value pairs
to cache values for local aggregation. This is awesome, except it means that
identical key-value outputs before a shuffle will only have one copy in the
Multimap, which means that the aggregation counts may not be correct. We should
fix it to use a proper Map<K, List<V>> to ensure that duplicate values are
aggregated correctly.
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