Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/5836#issuecomment-98549632
To address your comment from JIRA:
> 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.
We should handle this corner case. One approach might be to store a
negative value for the record length. We should add a test case to
BytesToBytesMapSuite that tries storing empty keys and values.
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