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https://issues.apache.org/jira/browse/CASSANDRA-6806?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benedict resolved CASSANDRA-6806.
---------------------------------

    Resolution: Won't Fix

This is a minor improvement, and it is likely we will deliver a new memtable 
data structure after CASSANDRA-7447, so wont' fixing

> In AtomicBTreeColumns, construct list of unwinds after a race lazily
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-6806
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6806
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Benedict
>            Priority: Minor
>             Fix For: 3.0
>
>
> Currently we store these in a List, but this is wasteful. We can construct 
> them lazily from a diff between the original and partially constructed 
> replacement BTree. The UpdaterFunction could define a method to be passed 
> such a collection in the event of an early abort.



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