[jira] [Commented] (GIRAPH-938) Allow fast working with primitives generically

["Igor Kabiljo (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GIRAPH-938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14088737#comment-14088737 ] 

Igor Kabiljo commented on GIRAPH-938:
-------------------------------------

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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