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https://issues.apache.org/jira/browse/CASSANDRA-3168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-3168:
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Attachment: 3168.txt
patch to remove allocator.size() from getLiveSize calculation. also adds note
about arena allocation to NEWS.
> Arena allocation causes excessive flushing on small heaps
> ---------------------------------------------------------
>
> Key: CASSANDRA-3168
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3168
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 1.0
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Fix For: 1.0
>
> Attachments: 3168.txt
>
>
> adding allocator.size() to Memtable.getLiveSize has two problems:
> 1) it double-counts allocated parts of regions
> 2) it makes the size of an empty memtable the size of a single region
> (2) is a particular problem because flushing a nearly-empty memtable will not
> actually free up much memory -- we just trade one almost-empty region, for
> another. In testing, I even saw this happening to the low-traffic system
> tables like LocationInfo.
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