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https://issues.apache.org/jira/browse/CASSANDRA-17402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500491#comment-17500491
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Jacek Lewandowski commented on CASSANDRA-17402:
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[~adelapena] yes, sorry for not pasting
[j8|https://app.circleci.com/pipelines/github/jacek-lewandowski/cassandra/181/workflows/5c75c903-9c0f-473a-ad31-7325f23af85d]
[j11|https://app.circleci.com/pipelines/github/jacek-lewandowski/cassandra/181/workflows/e4f860aa-d866-4776-b8c0-d3fe2df2db78]
> 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: 20m
> 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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