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https://issues.apache.org/jira/browse/CASSANDRA-5521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13646583#comment-13646583
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Jonathan Ellis commented on CASSANDRA-5521:
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As Pavel notes, the most important use of getKey is the one in binarySearch.
But here we only care about the comparison, we don't actually need the artifact
of a ByteBuffer. So why not compare directly without creating a buffer first?
No buffer at all is even cheaper than a native buffer.
(This would also mean that we only need to look at as many bytes as it takes
before the first difference is found.)
> move IndexSummary off heap
> --------------------------
>
> Key: CASSANDRA-5521
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5521
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Vijay
> Fix For: 2.0
>
>
> IndexSummary can still use a lot of heap for narrow-row sstables. (It can
> also contribute to memory fragmentation because of the large arrays it
> creates.)
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