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https://issues.apache.org/jira/browse/CASSANDRA-5521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13644229#comment-13644229
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Jonathan Ellis commented on CASSANDRA-5521:
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Seems inefficient to make the "get pair" the unit of fetching memory, since
usually you want the key or the position but not both. (You wouldn't have to
change the signature of getKey either, if you just fetched the key into a
byte[] directly instead of wrapping half of it.)
What's the upgrade path? Would prefer "automatically rebuilds old summaries"
to "user has to manually blow away summaries or it dies trying to start."
> 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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