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From horschi <hors...@gmail.com>
Subject Re: TTL and gc_grace_Seconds
Date Wed, 18 Sep 2013 14:42:45 GMT
Hi Christopher,

in 2.0 gc_grace should be capped by TTL anyway: see CASSANDRA-4917

cheers,
Christian



On Wed, Sep 18, 2013 at 4:29 PM, Christopher Wirt <chris.wirt@struq.com>wrote:

> I have a column family contains time series events, all columns have a 24
> hour TTL and gc_grace_seconds is currently 20 days. There is a TimeUUID in
> part of the key.****
>
> ** **
>
> It takes 15 days to repair the entire ring.****
>
> ** **
>
> Consistency is not my main worry. Speed is. We currently write to this CF
> at LOCAL_QUORUM and read at ONE.****
>
> ** **
>
> Is there any reason to have gc_grace_seconds higher than the TTL? Feels
> like I’m just wasting resources all over given my consistency and speed
> requirements. ****
>
> ** **
>
> ** **
>
> Second question.****
>
> Does anyone vary their read repair ratio throughout the day.. i.e. at peak
> turn off read repairs, turn to 0.7 for the grave yard shift.****
>
> ** **
>
> ** **
>
> Cheers,****
>
> Chris****
>

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