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From Jonathan Ellis <>
Subject Re: Cassandra client - clock sync
Date Tue, 13 Jul 2010 13:28:03 GMT
You should use ntp in daemon mode, not as a one-time fix.

On Tue, Jul 13, 2010 at 2:45 AM, Narendra Sharma
<> wrote:
> Hi,
> We have an application that uses Cassandra to store data. The application is
> deployed on multiple nodes that are part of an application cluster. We are
> at present using single Cassandra node. We have noticed few errors in
> application and our analysis revealed that the root cause was that the clock
> on different application nodes was off by few miliseconds (approx 3.5 ms).
> AFAIK all the application nodes using Cassandra should have clock synched.
> Is this understanding correct? If yes, what is the recommended way to keep
> the clocks in sync? Even if we use NTP the clocks go out of sync after few
> hours. Should we write a cron job to sync time every N minutes or hours?
> What is the recommendation in production? How are other Cassandra users
> handling the clock sync in production environment?
> Thanks,
> Naren

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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