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From "Erik Hansen (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-6944) liveRatio jumps to max when Memtable is empty
Date Thu, 27 Mar 2014 20:51:16 GMT
Erik Hansen created CASSANDRA-6944:

             Summary: liveRatio jumps to max when Memtable is empty
                 Key: CASSANDRA-6944
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: SUSE Linux Enterprise 11 (64-bit)
            Reporter: Erik Hansen
            Priority: Minor

liveRatio calculation on an empty memtable results in a value of Infinity since memtable.currentSize=0.
 Infinity then gets capped at the liveRatio max of 64.

WARN [MemoryMeter:1] 2014-03-19 09:26:59,483 (line 441) setting live ratio to
maximum of 64.0 instead of Infinity
INFO [MemoryMeter:1] 2014-03-19 09:26:59,485 (line 452) CFS(Keyspace='system',
ColumnFamily='compactions_in_progress') liveRatio is 64.0 (just-counted was 64.0).  calculation
took 7ms for 0 cells

Jumping liveRatio to the max value based on an empty Memtable leads to more frequent flushing
than may be necessary.

CASSANDRA-4243 previously addressed this issue, but was resolved as fixed by CASSANDRA-3741.
 It does not appear this issue has been fixed as of 2.0.5

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