On Mon, Nov 10, 2014 at 12:46 PM, Duncan Sands <duncan.sa...@gmail.com> wrote:
> Hi Paulo, > > On 10/11/14 15:18, Paulo Ricardo Motta Gomes wrote: > >> Hey, >> >> We've seen a considerable increase in the number of dropped mutations >> after a >> major upgrade from 1.2.18 to 2.0.10. I initially thought it was due to >> the extra >> load incurred by upgradesstables, but the dropped mutations continue even >> after >> all sstables are upgraded. >> > > are the clocks on all your nodes synchronized with each other? > > Ciao, Duncan. > Yes, the servers are synchronized via NTP. Cheers! > > >> Additional info: Overall (read, write and range) latency improved with the >> upgrade, which is great, but I don't understand why dropped mutations has >> increased. I/O and CPU load is pretty much the same, number of completed >> tasks >> is the only metric that increased together with dropped mutations. >> >> I also noticed that the number of "all time blocked" FlushWriter >> operations is >> about 5% of completed operations, don't know if this is related, but in >> case it >> helps out... >> >> Anyone has a clue on what could that be? Or what should we monitor to >> find out? >> Any help or JIRA pointers would be kindly appreciated. >> >> Cheers, >> >> -- >> *Paulo Motta* >> >> Chaordic | /Platform/ >> _www.chaordic.com.br <http://www.chaordic.com.br/>_ >> +55 48 3232.3200 >> > > -- *Paulo Motta* Chaordic | *Platform* *www.chaordic.com.br <http://www.chaordic.com.br/>* +55 48 3232.3200
