Radim Kolar created CASSANDRA-4243:
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             Summary: skip liveratio calc if memtable has 0 columns
                 Key: CASSANDRA-4243
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4243
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.10
            Reporter: Radim Kolar
            Priority: Minor


liveratio calc should do nothing if memtable has 0 columns. I did manual flush 
before this:

WARN [MemoryMeter:1] 2012-05-10 13:21:19,430 Memtable.java (line 181) setting 
live ratio to maximum of 64 instead of Infinity
INFO [MemoryMeter:1] 2012-05-10 13:21:19,431 Memtable.java (line 186) 
CFS(Keyspace='rapidshare', ColumnFamily='resultcache') liveRatio is 64.0 
(just-counted was 64.0).  calculation took 1ms for 0 columns

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