Mutation messages dropped

["Raveendran, Varsha IN BLR STS" <va...@siemens.com>]

Hello,

I am writing around 10Million records continuously into a single node Cassandra (2.0.5) .
In the Cassandra log file I see an entry "272 MUTATION messages dropped in last 5000ms" . Does this mean that 272 records were not written successfully?

Thanks,
Varsha

Re: Mutation messages dropped

[Paulo Ricardo Motta Gomes <pa...@chaordicsystems.com>]

It means asynchronous write mutations were dropped, but if the writes are
completing without TimedOutException, then at least ConsistencyLevel
replicas were correctly written. The remaining replicas will eventually be
fixed by hinted handoff, anti-entropy (repair) or read repair.

More info: http://wiki.apache.org/cassandra/FAQ#dropped_messages

Please note that 1 mutation != 1 record. For instance, if 1 row has N
columns, than a record write for that row will have N mutations AFAIK
(please correct me if I'm wrong).

On Fri, May 9, 2014 at 8:52 AM, Raveendran, Varsha IN BLR STS <
varsha.raveendran@siemens.com> wrote:

>  Hello,
>
> I am writing around 10Million records continuously into a single node
> Cassandra (2.0.5) .
> In the Cassandra log file I see an entry “*272 MUTATION messages dropped
> in last 5000ms*” . Does this mean that 272 records were not written
> successfully?
>
> Thanks,
> Varsha
>
>



-- 
*Paulo Motta*

Chaordic | *Platform*
*www.chaordic.com.br <http://www.chaordic.com.br/>*
+55 48 3232.3200

Re: Mutation messages dropped

[Chris Lohfink <cl...@blackbirdit.com>]

Shameless plug: http://www.evidencebasedit.com/guide-to-cassandra-thread-pools/#droppable

On May 15, 2014, at 7:37 PM, Mark Reddy <ma...@boxever.com> wrote:

> Yes, please see http://wiki.apache.org/cassandra/FAQ#dropped_messages for further details.
> 
> 
> Mark
> 
> 
> On Fri, May 9, 2014 at 12:52 PM, Raveendran, Varsha IN BLR STS <va...@siemens.com> wrote:
> Hello,
>  
> I am writing around 10Million records continuously into a single node Cassandra (2.0.5) .
> In the Cassandra log file I see an entry “272 MUTATION messages dropped in last 5000ms” . Does this mean that 272 records were not written successfully?
>  
> Thanks,
> Varsha
>  
> 

Re: Mutation messages dropped

[Mark Reddy <ma...@boxever.com>]

Yes, please see http://wiki.apache.org/cassandra/FAQ#dropped_messages for
further details.


Mark


On Fri, May 9, 2014 at 12:52 PM, Raveendran, Varsha IN BLR STS <
varsha.raveendran@siemens.com> wrote:

>  Hello,
>
> I am writing around 10Million records continuously into a single node
> Cassandra (2.0.5) .
> In the Cassandra log file I see an entry “*272 MUTATION messages dropped
> in last 5000ms*” . Does this mean that 272 records were not written
> successfully?
>
> Thanks,
> Varsha
>
>