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Posted to user@cassandra.apache.org by "wxn002@zjqunshuo.com" <wx...@zjqunshuo.com> on 2016/11/18 09:41:30 UTC
Is it a must to run Cassandra repair in scheduled time
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?
Cheers,
-Simon Wu
Re: Is it a must to run Cassandra repair in scheduled time
Posted by Paulo Motta <pa...@gmail.com>.
This is an informative piece on (anti-entropy) repairs:
https://cassandra-zone.com/understanding-repairs/
2016-11-18 8:12 GMT-02:00 wxn002@zjqunshuo.com <wx...@zjqunshuo.com>:
> Thanks Ben for the response. It's very helpfull and it's really what I
> want.
>
>
> *From:* Ben Dalling <b....@locp.co.uk>
> *Date:* 2016-11-18 18:07
> *To:* user <us...@cassandra.apache.org>
> *Subject:* Re: Is it a must to run Cassandra repair in scheduled time
> Hi Simon,
>
> See http://www.datastax.com/dev/blog/repair-in-cassandra 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 at
> https://lostechies.com/ryansvihla/2015/09/25/cassandras-repair-should-be-
> called-required-maintenance/
>
> Best wishes,
>
> Ben
>
> On 18 November 2016 at 09:41, wxn002@zjqunshuo.com <wx...@zjqunshuo.com>
> 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?
>>
>> Cheers,
>> -Simon Wu
>>
>
Re: Is it a must to run Cassandra repair in scheduled time
Posted by "wxn002@zjqunshuo.com" <wx...@zjqunshuo.com>.
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 http://www.datastax.com/dev/blog/repair-in-cassandra 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 at https://lostechies.com/ryansvihla/2015/09/25/cassandras-repair-should-be-called-required-maintenance/
Best wishes,
Ben
On 18 November 2016 at 09:41, wxn002@zjqunshuo.com <wx...@zjqunshuo.com> 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?
Cheers,
-Simon Wu
Re: Is it a must to run Cassandra repair in scheduled time
Posted by Ben Dalling <b....@locp.co.uk>.
Hi Simon,
See http://www.datastax.com/dev/blog/repair-in-cassandra 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 at
https://lostechies.com/ryansvihla/2015/09/25/cassandras-repair-should-be-called-required-maintenance/
Best wishes,
Ben
On 18 November 2016 at 09:41, wxn002@zjqunshuo.com <wx...@zjqunshuo.com>
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?
>
> Cheers,
> -Simon Wu
>