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https://issues.apache.org/jira/browse/CASSANDRA-21472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18091252#comment-18091252
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Dmitry Konstantinov commented on CASSANDRA-21472:
-------------------------------------------------

Some of the changes are actually followups of previous ones, for example: this 
part 
https://github.com/apache/cassandra/pull/4900/changes#diff-24bf23a6435f78db7cf54aaf773f97c6355653443746a4750bec1cd01c0d4eddR663
 is the same as 
https://github.com/apache/cassandra/commit/40f9ca60f103783aa481bc9a91b92fd55b4ea625#diff-a321a5f04d8455a5441328c0cb175fd55a31b39e20f43fd99d3f9c57927f120dR144
 

> 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
>          Time Spent: 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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