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https://issues.apache.org/jira/browse/CRUNCH-598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15210610#comment-15210610
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Josh Wills commented on CRUNCH-598:
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[~desmit] what do you imagine as a fix here? A constructor argument for
DefaultJoinStrategy (and possibly ShardedJoinStrategy?)
> 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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