cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Erik Hansen (JIRA)" <j...@apache.org>
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
                 URL: https://issues.apache.org/jira/browse/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.

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

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



--
This message was sent by Atlassian JIRA
(v6.2#6252)

Mime
View raw message