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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: Tomstones impact on repairs both anti-entropy and read repair
Date Wed, 16 Nov 2016 15:48:01 GMT
Hi,


> My question to the community is will tombstone cause issues in data
> consistency across the DCs.


It might, if your repairs are not succeeding for some reason or not running
fully (all the token ranges) within gc_grace_second (parameter at the table
level)

I wrote a blog post and talked about that at the summit, see:

http://thelastpickle.com/blog/2016/07/27/about-deletes-and-tombstones.html
https://www.youtube.com/watch?v=lReTEcnzl7Y

Let me know if you still have questions after reading / listening to this.

C*heers,
-----------------------
Alain Rodriguez - @arodream - alain@thelastpickle.com
France

The Last Pickle - Apache Cassandra Consulting
http://www.thelastpickle.com

2016-11-14 17:52 GMT+01:00 K F <kf200467@yahoo.com>:

> Hi Folks,
>
> I have a table that has lot of tombstones generated and has caused
> inconsistent data across various datacenters. we run anti-entropy repairs
> and also have read_repair_chance tuned-up during our non busy hours. But
> yet when we try to compare data residing in various replicas across DCs, we
> see inconsistency.
>
> My question to the community is will tombstone cause issues in data
> consistency across the DCs.
>
> Thanks.
>

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