Stefan De Smit created CRUNCH-598:
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Summary: scaleFactor for JoinStrategy
Key: CRUNCH-598
URL: https://issues.apache.org/jira/browse/CRUNCH-598
Project: Crunch
Issue Type: Improvement
Reporter: Stefan De Smit
Priority: Minor
the scaleFactor method has a big influence on planner.
For joins, there currently isn't a clean way to set this, while it often is required, as a
join can have a big multiply factor.
for the DefaultJoinStrategy, it's possible to add a custom JoinFn with proper scaleFactor,
or just extend the default InnerJoinFn with a scaleFactor.
For the ShardedJoinStrategy, this isn't possible, while it often is needed more (as ShardedJoin
is especially handy for 1 to really many).
For the default ConstantShardingStrategy, it might make sense to use the numShards also as
scalingFactor for left side. as that's kind of what happens: emit every left entry numShards
times.
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