Bogus MemoryMeter liveRatio calculations
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Key: CASSANDRA-4065
URL: https://issues.apache.org/jira/browse/CASSANDRA-4065
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 1.0.8
Reporter: Daniel Doubleday
Priority: Minor
I get strange cfs.liveRatios.
A couple of mem meter runs seem to calculate bogus results:
{noformat}
Tue 09:14:48 dd@blnrzh045:~$ grep 'setting live ratio to maximum of 64 instead
of' /var/log/cassandra/system.log
WARN [MemoryMeter:1] 2012-03-20 08:08:07,253 Memtable.java (line 193) setting
live ratio to maximum of 64 instead of Infinity
WARN [MemoryMeter:1] 2012-03-20 08:08:09,160 Memtable.java (line 193) setting
live ratio to maximum of 64 instead of Infinity
WARN [MemoryMeter:1] 2012-03-20 08:08:13,274 Memtable.java (line 193) setting
live ratio to maximum of 64 instead of Infinity
WARN [MemoryMeter:1] 2012-03-20 08:08:22,032 Memtable.java (line 193) setting
live ratio to maximum of 64 instead of Infinity
WARN [MemoryMeter:1] 2012-03-20 08:12:41,057 Memtable.java (line 193) setting
live ratio to maximum of 64 instead of 67.11787351054079
WARN [MemoryMeter:1] 2012-03-20 08:13:50,877 Memtable.java (line 193) setting
live ratio to maximum of 64 instead of 112.58547951925435
WARN [MemoryMeter:1] 2012-03-20 08:15:29,021 Memtable.java (line 193) setting
live ratio to maximum of 64 instead of 193.36945063589877
WARN [MemoryMeter:1] 2012-03-20 08:17:50,716 Memtable.java (line 193) setting
live ratio to maximum of 64 instead of 348.45008340969434
{noformat}
Because meter runs never decrease liveRatio in Memtable (Which seems strange to
me. If past calcs should be included for any reason wouldn't averaging make
more sense?):
{noformat}
cfs.liveRatio = Math.max(cfs.liveRatio, newRatio);
{noformat}
Memtables are flushed every couple of secs:
{noformat}
ColumnFamilyStore.java (line 712) Enqueuing flush of
Memtable-BlobStore@935814661(1874540/149963200 serialized/live bytes, 202 ops)
{noformat}
Even though a saner liveRatio has been calculated after the bogus runs:
{noformat}
INFO [MemoryMeter:1] 2012-03-20 08:19:55,934 Memtable.java (line 198)
CFS(Keyspace='SmeetBlob', ColumnFamily='BlobStore')
liveRatio is 64.0 (just-counted was 2.97165811895841). calculation took
124ms for 58 columns
{noformat}
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