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https://issues.apache.org/jira/browse/CASSANDRA-17402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500725#comment-17500725
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Andres de la Peña commented on CASSANDRA-17402:
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[~jlewandowski] it looks good, could you please prepare a PR for trunk? There
could be some divergence there due to CASSANDRA-16896.
> Unshared heap size excluding data calculation is broken
> -------------------------------------------------------
>
> Key: CASSANDRA-17402
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17402
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Memtable
> Reporter: Jacek Lewandowski
> Assignee: Jacek Lewandowski
> Priority: Normal
> Fix For: 4.1, 4.0.x
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Unshared heap size excluding data calculation is broken.
> For example, it does not takes into consideration whether the buffers are
> on-heap or off-heap - empty offheap buffer is 64-bytes while empty heap
> buffer is 48-bytes.
> It matters especially when we have offheap buffers-based memtables.
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