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https://issues.apache.org/jira/browse/CASSANDRA-2148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthew F. Dennis updated CASSANDRA-2148:
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Attachment: (was: 2148-cassandra-0.7.txt)
> system CFs default to large memtable throughputs on large heaps
> ---------------------------------------------------------------
>
> Key: CASSANDRA-2148
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2148
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Matthew F. Dennis
> Assignee: Matthew F. Dennis
> Fix For: 0.7.2
>
> Attachments: 2148-cassandra-0.7.txt
>
>
> The default memtableThroughputInMB is calculated now based on the heap size.
> Most people running with a large heap in production explicitly set it for
> their memtable(s). However, the the CFs in the system keyspace still default
> to the calculated value which on a large heap can be quite large.
> HintsColumnFamily is really the only problematic one though as the others are
> flushed afters changes to them.
> we should:
> 1) set the throughput on the hints CF to a reasonable max and min value -
> min(256, max(32, normalDefault/2))
> 2) set the throughput on the other system CFs to some small constant value
> (just as a safety); 8M sounds good
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