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https://issues.apache.org/jira/browse/GIRAPH-938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14088737#comment-14088737
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Igor Kabiljo commented on GIRAPH-938:
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https://reviews.facebook.net/D21261
> Allow fast working with primitives generically
> ----------------------------------------------
>
> Key: GIRAPH-938
> URL: https://issues.apache.org/jira/browse/GIRAPH-938
> Project: Giraph
> Issue Type: Improvement
> Components: lib
> Reporter: Igor Kabiljo
>
> Currently, there are generic classes that handle any types, but are slow and
> take a lot of memory. So there are a lot of primitive specific classes, that
> just copy the same code, with different types.
> That means both huge code duplication (which makes it easy to have bugs, and
> have versions out of sync), and there are always usecases with types that are
> not covered - and so fallback to very inefficient version.
> It is extremely expensive to use wrapped classes for making things work
> generically - Integer, Long, etc.
> But using IntWritable, LongWritable, etc isn't, because they are mutable, and
> we can have one reused object, which can be used as data transfer.
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