ugust 2013 20:30
To: user@cassandra.apache.org
Subject: Re: Counters and replication
On 5 August 2013 20:04, Christopher Wirt wrote:
Hello,
Question about counters, replication and the ReplicateOnWriteStage
I've recently turned on a new CF which uses a counter column.
We have a three DC setu
We've seen high CPU in tests on stress tests with counters. With our
workload, we had some hot counters (e.g. ones with 100s increments/sec)
with RF = 3, which caused the load to spike and replicate on write tasks to
back up on those three nodes. Richard already gave a good overview of why
this hap
On 5 August 2013 20:04, Christopher Wirt wrote:
> Hello,
>
> ** **
>
> Question about counters, replication and the ReplicateOnWriteStage
>
> ** **
>
> I’ve recently turned on a new CF which uses a counter column.
>
> ** **
>
> We have a three DC setup running Cassandra 1.2.4 with vN
Dne 25.5.2012 2:41, Edward Capriolo napsal(a):
Also it does not sound like you have run anti entropy repair. You
should do that when upping rf.
i run entropy repairs and it still does not fix counters. I have some
reports from users with same problem but nobody discovered repeatable
scenario.
Also it does not sound like you have run anti entropy repair. You should do
that when upping rf.
On Monday, May 21, 2012, Radim Kolar wrote:
> Dne 26.3.2012 19:17, aaron morton napsal(a):
>>
>> Can you describe the situations where counter updates are lost or go
backwards ?
>>
>> Do you ever get T
Dne 26.3.2012 19:17, aaron morton napsal(a):
Can you describe the situations where counter updates are lost or go
backwards ?
Do you ever get TimedOutExceptions when performing counter updates ?
we got few timeouts per day but not much, less then 10. I do not think
that timeouts will be root c
Can you describe the situations where counter updates are lost or go backwards ?
Do you ever get TimedOutExceptions when performing counter updates ?
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 24/03/2012, at 6:34 PM, Radim Kolar wrot
I still have wrong results (I simulated an event 5 times and it was
counted 3 times by some counters 4 or 5 times by others.
I have also wrong results with counters in 1.0.8, many times updates to
counter column are just lost and sometimes counters are going backwards
even if our app uses only
Most welcome, hopefully the bug is easy to find and kill :)
On Tue, Nov 8, 2011 at 3:28 AM, Alain RODRIGUEZ wrote:
> Sylvain, here is my ticket, but I guess you already know it since you are
> the assignee :) -->https://issues.apache.org/jira/browse/CASSANDRA-3465
> Riyad, Thanks for your help.
Sylvain, here is my ticket, but I guess you already know it since you are
the assignee :) -->https://issues.apache.org/jira/browse/CASSANDRA-3465
Riyad, Thanks for your help.
Alain
2011/11/7 Riyad Kalla
> Alain thank you for all the clarification, I understand exactly what you
> meant now... an
Alain thank you for all the clarification, I understand exactly what you
meant now... and as a result am just as confused as you are :)
What version of Cassandra are you using? Can you share the important parts
of your config? (you double checked that your replication factor is set on
all 3 to "3"
This sound like a bug 'a priori'. Do you mind opening a ticket at
https://issues.apache.org/jira/browse/CASSANDRA?
It will help if you can specify which version you are using and the
exact procedure you did that leads to that.
If know how to reproduce, that would be even better.
--
Sylvain
On Mon
I retried it after restarting all the servers.
I still have wrong results (I simulated an event 5 times and it was counted
3 times by some counters 4 or 5 times by others.
What I meant by "but now every request returns me always the same count
value..." will be easier to explain with an example :
Alain,
When you tried CL.All was that only after you had made the change of
ReplicationFactor=3 and restarted all the servers?
If you hadn't restarted the servers with the new RF, I am not sure that
CL.All would have the intended effect.
Also, I wasn't sure what you meant by "but know every requ
I've tried with CL.All, but it doesn't wotk better. I still have strange
values (between 4 and 10 events counted instead of 10) but know every
request returns me always the same count value...
It's very strange.
Any other idea ?
Alain
2011/11/7 Riyad Kalla
> Alain,
>
> Try using a CL of 3 or
Alain,
Try using a CL of 3 or "ALL" and see if that the problem goes away.
Your replication factor (as I just learned) dictates how many nodes each
piece of data is replicated to; by using a RF of 3 you are saying
"replicate all my data to all my nodes" (in this case counters).
This doesn't happ
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