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From "Matthew F. Dennis (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-2148) system CFs default to large memtable throughputs on large heaps
Date Wed, 09 Feb 2011 21:11:57 GMT
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


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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