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https://issues.apache.org/jira/browse/CASSANDRA-2006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008087#comment-13008087
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Stu Hood commented on CASSANDRA-2006:
-------------------------------------
HBase accomplishes this by keeping a threshold of heap usage for Memtables, and
flushing the largest when the threshold is crossed: similar to the safety
threshold that jbellis added recently.
> Serverwide caps on memtable thresholds
> --------------------------------------
>
> Key: CASSANDRA-2006
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2006
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Stu Hood
> Fix For: 0.8
>
>
> By storing global operation and throughput thresholds, we could eliminate the
> "many small memtables" problem caused by having many CFs. The global
> threshold would be set in the config file, to allow different classes of
> servers to have different values configured.
> Operations occurring in the memtable would add to the global counters, in
> addition to the memtable-local counters. When a global threshold was
> violated, the memtable in the system that was using the largest fraction of
> it's local threshold would be flushed. Local thresholds would continue to act
> as they always have.
> The result would be larger sstables, safer operation with multiple CFs and
> per node tuning.
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