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https://issues.apache.org/jira/browse/CASSANDRA-21472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18097158#comment-18097158
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Caleb Rackliffe commented on CASSANDRA-21472:
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4.0 patch LGTM
> MemtableReclaimMemory AssertionError: Negative released is possible in case
> of non-leaf-only B-tree update
> ----------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-21472
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21472
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Local/Memtable
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 4.0.x, 5.0.x, 6.x, 7.x
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> we have asymmetry in BTree heap usage measurement: when we remove a complex
> column we measure heap size for inner BTree cells using
> org.apache.cassandra.utils.btree.BTree#sizeOnHeapOf which includes size maps.
> When we update a BTree by adding elements into it then we do not include size
> maps.
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