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https://issues.apache.org/jira/browse/SPARK-7251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14522977#comment-14522977
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Chen Song commented on SPARK-7251:
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Can the key could be empty? If we allow the key could be zero, it's impossible
to deal the useless memory of the end page. Because I don't know if it's at the
end of the page or just the key is empty. Of couse I have to setMemory to zero.
> Perform sequential scan when iterating over entries in BytesToBytesMap
> ----------------------------------------------------------------------
>
> Key: SPARK-7251
> URL: https://issues.apache.org/jira/browse/SPARK-7251
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Josh Rosen
>
> In BytesToBytesMap, {{iterator()}} iterates in order of set bits in the
> bitmap, but it would be faster to iterate directly through the data pages,
> since this will result in less random memory access.
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