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From "Sylvain Lebresne (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3465) Wrong counters values when RF > 1
Date Tue, 08 Nov 2011 17:07:51 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13146402#comment-13146402
] 

Sylvain Lebresne commented on CASSANDRA-3465:
---------------------------------------------

Haven't been able to reproduce yet, even with more counters and more iterations. I didn't
phpcassa though (but I tried mimicking the test as best as possible), so it could be worth
making sure this doesn't come from that.

Did you look at the logs of the nodes after the test to see if there was anything wrong in
there. Otherwise, if you can try enabling debug logs on each of the nodes, running your test
above (with CL.QUORUM or CL.ALL, *not* CL.ONE) and attach the resulting logs.
                
> Wrong counters 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
>            Assignee: Sylvain Lebresne
>            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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