Thank you to all who replied so far, thank you Ben for the links you provided!
________________________________ From: Ben Slater <ben.sla...@instaclustr.com> Sent: Friday, March 9, 2018 12:12:09 AM To: user@cassandra.apache.org Subject: Re: Amazon Time Sync Service + ntpd vs chrony It is important to make sure you are using the same NTP servers across your cluster - we used to see relatively frequent NTP issues across our fleet using default/public NTP servers until (back in 2015) we implemented our own NTP pool (see https://www.instaclustr.com/apache-cassandra-synchronization/ which references some really good and detailed posts from logentries.com<http://logentries.com> on the potential issues). Cheers Ben On Fri, 9 Mar 2018 at 02:07 Michael Shuler <mich...@pbandjelly.org<mailto:mich...@pbandjelly.org>> wrote: As long as your nodes are syncing time using the same method, that should be good. Don't mix daemons, however, since they may sync from different sources. Whether you use ntpd, openntp, ntpsec, chrony isn't really important, since they are all just background daemons to sync the system clock. There is nothing Cassandra-specific. -- Kind regards, Michael On 03/08/2018 04:15 AM, Kyrylo Lebediev wrote: > Hi! > > Recently Amazon announced launch of Amazon Time Sync Service > (https://aws.amazon.com/blogs/aws/keeping-time-with-amazon-time-sync-service/) > and now it's AWS-recommended way for time sync on EC2 instances > (https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-time.html). > It's stated there that chrony is faster / more precise than ntpd. > > Nothing to say correct time sync configuration is very important for any > C* setup. > > Does anybody have positive experience using crony, Amazon Time Sync > Service with Cassandra and/or combination of them? > Any concerns regarding chrony + Amazon Time Sync Service + Cassandra? > Are there any chrony best-practices/custom settings for C* setups? > > Thanks, > Kyrill > --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org<mailto:user-unsubscr...@cassandra.apache.org> For additional commands, e-mail: user-h...@cassandra.apache.org<mailto:user-h...@cassandra.apache.org> -- Ben Slater Chief Product Officer [https://cdn2.hubspot.net/hubfs/2549680/Instaclustr-Navy-logo-new.png]<https://www.instaclustr.com/> [http://cdn2.hubspot.net/hubfs/184235/dev_images/signature_app/facebook_sig.png]<https://www.facebook.com/instaclustr> [http://cdn2.hubspot.net/hubfs/184235/dev_images/signature_app/twitter_sig.png] <https://twitter.com/instaclustr> [http://cdn2.hubspot.net/hubfs/184235/dev_images/signature_app/linkedin_sig.png] <https://www.linkedin.com/company/instaclustr> Read our latest technical blog posts here<https://www.instaclustr.com/blog/>. This email has been sent on behalf of Instaclustr Pty. Limited (Australia) and Instaclustr Inc (USA). This email and any attachments may contain confidential and legally privileged information. If you are not the intended recipient, do not copy or disclose its content, but please reply to this email immediately and highlight the error to the sender and then immediately delete the message.
