cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "" <>
Subject Re: Is it a must to run Cassandra repair in scheduled time
Date Fri, 18 Nov 2016 10:12:44 GMT
Thanks Ben for the response. It's very helpfull and it's really what I want.
From: Ben Dalling
Date: 2016-11-18 18:07
To: user
Subject: Re: Is it a must to run Cassandra repair in scheduled time
Hi Simon,

See for a good explanation.  Basically
repair is not a good word because it suggests it is fixing something that is broken.  This
is not the case.  It ensures the consistency across your cluster.  Not running repairs is
a VERY BAD THING.  Key things to check are how long do your repairs take and do they affect
the operation of your cluster.  Decide how often and when to run them based on this.  The
general rule of thumb is to run them within the gc_grace_seconds.  Another good article is
Cassandra’s “Repair” Should Be Called “Required Maintenance” which is available

Best wishes,


On 18 November 2016 at 09:41, <> wrote:
Hi All,
I'm new to Cassandra and from the mail chain seemed repair is an important thing to do. To
avoid trouble in putting Cassandra in production environment, I have some questions.
1. What exactly does Cassandra repair do?
2. I saw someone do repair in scheduled time, daily or weekly. Is it a must to do this?
3. In which cases do I need to do repair?

-Simon Wu
View raw message