Wrong cunters values when RF > 1
--------------------------------
Key: CASSANDRA-3465
URL: https://issues.apache.org/jira/browse/CASSANDRA-3465
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 1.0.0
Environment: Amazon EC2 (cluster of 5 t1.micro), phpCassa 0.8.a.2
Reporter: Alain RODRIGUEZ
Priority: Critical
I have got a CF that contains many counters of some events. When I'm at RF = 1
and simulate 10 events, they are well counted.
However, when I switch to a RF = 3, my counter show a wrong value that
sometimes change when requested twice (it can return 7, then 5 instead of 10
all the time).
I first thought that it was a problem of CL because I seem to remember that I
read once that I had to use CL.One for reads and writes with counters. So I
tried with CL.One, without success...
/*-------------------------------------------------- CODE
-------------------------------------------------------*/
$servers = array("ec2-xxx-xxx-xxx-xxx.eu-west-1.compute.amazonaws.com",
"ec2-yyy-yyy-yyy-yyy.eu-west-1.compute.amazonaws.com",
"ec2-zzz-zzz-zzz-zzz.eu-west-1.compute.amazonaws.com",
"ec2-aaa-aaa-aaa-aaa.eu-west-1.compute.amazonaws.com",
"ec2-bbb-bbb-bbb-bbb.eu-west-1.compute.amazonaws.com");
$pool = new ConnectionPool("mykeyspace", $servers);
$stats_test = new ColumnFamily($pool, 'stats_test',
$read_consistency_level=cassandra_ConsistencyLevel::ONE,
$write_consistency_level=cassandra_ConsistencyLevel::ONE);
$time = date( 'YmdH', time());
for($i=0; $i<10; $i++){
for($c=1; $c<=3; $c++){
$stats_test->add($c, $time.':test');
}
$counts = $stats_test->multiget(array(1,2,3));
echo('Counter1: '.$counts[1][$time.':test']."\n");
echo('Counter2: '.$counts[2][$time.':test']."\n");
echo('Counter3: '.$counts[3][$time.':test']."\n\n");
}
/*-------------------------------- END OF CODE
-------------------------------------------------------------------------*/
/*-------------------------------------------------- OUTPUT
------------------------------------------------------------*/
Counter1: 1
Counter2: 1
Counter3: 1
Counter1: 2
Counter2: 2
Counter3: 2
Counter1: 3
Counter2: 3
Counter3: 3
Counter1: 3
Counter2: 4
Counter3: 4
Counter1: 4
Counter2: 5
Counter3: 3
Counter1: 5
Counter2: 6
Counter3: 3
Counter1: 6
Counter2: 7
Counter3: 4
Counter1: 4
Counter2: 8
Counter3: 7
Counter1: 5
Counter2: 9
Counter3: 8
Counter1: 8
Counter2: 4
Counter3: 9
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