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From: Alain RODRIGUEZ <arodrime@gmail.com>
Date: Wed, 16 Nov 2016 16:48:01 +0100
Message-ID: <CA+VSrLoReq=pO0Rp6-eP4nrbN2_A4PEFuOrMek7RhwcmZX+0Zw@mail.gmail.com>
Subject: Re: Tomstones impact on repairs both anti-entropy and read repair
To: user@cassandra.apache.org, K F <kf200467@yahoo.com>
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archived-at: Wed, 16 Nov 2016 15:48:36 -0000

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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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<div dir=3D"ltr"><div>Hi,</div><div>=C2=A0</div><blockquote class=3D"gmail_=
quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,=
204);padding-left:1ex"><span style=3D"color:rgb(0,0,0);font-family:verdana,=
helvetica,sans-serif;font-size:13px">My question to the community is will t=
ombstone cause issues in data consistency across the DCs.</span></blockquot=
e><div><br></div><div>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)</div><div><br></div><div>I wrote a blog post=
 and talked about that at the summit, see:</div><div><br></div><div><div st=
yle=3D"font-size:12.8px"><a href=3D"http://thelastpickle.com/blog/2016/07/2=
7/about-deletes-and-tombstones.html" target=3D"_blank">http://thelastpickle=
.com/blog/<wbr>2016/07/27/about-deletes-and-<wbr>tombstones.html</a><br></d=
iv><div style=3D"font-size:12.8px"><a href=3D"https://www.youtube.com/watch=
?v=3DlReTEcnzl7Y" target=3D"_blank">https://www.youtube.com/watch?<wbr>v=3D=
lReTEcnzl7Y</a></div></div><div style=3D"font-size:12.8px"><br></div><div s=
tyle=3D"font-size:12.8px">Let me know if you still have questions after rea=
ding / listening to this.</div><div style=3D"font-size:12.8px"><br></div><d=
iv style=3D"font-size:12.8px">C*heers,</div><div><div><span style=3D"font-s=
ize:12.8px">-----------------------</span></div><div><span style=3D"font-si=
ze:12.8px">Alain Rodriguez - @arodream - <a href=3D"mailto:alain@thelastpic=
kle.com">alain@thelastpickle.com</a></span></div><div><span style=3D"font-s=
ize:12.8px">France</span></div><div><span style=3D"font-size:12.8px"><br></=
span></div><div><span style=3D"font-size:12.8px">The Last Pickle - Apache C=
assandra Consulting</span></div><div><span style=3D"font-size:12.8px"><a hr=
ef=3D"http://www.thelastpickle.com">http://www.thelastpickle.com</a></span>=
</div></div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote"=
>2016-11-14 17:52 GMT+01:00 K F <span dir=3D"ltr">&lt;<a href=3D"mailto:kf2=
00467@yahoo.com" target=3D"_blank">kf200467@yahoo.com</a>&gt;</span>:<br><b=
lockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px =
#ccc solid;padding-left:1ex"><div><div style=3D"color:#000;background-color=
:#fff;font-family:verdana,helvetica,sans-serif;font-size:13px"><div id=3D"m=
_4181975993583792143yui_3_16_0_ym19_1_1479141514810_9636">Hi Folks,</div><d=
iv id=3D"m_4181975993583792143yui_3_16_0_ym19_1_1479141514810_9582"><br></d=
iv><div id=3D"m_4181975993583792143yui_3_16_0_ym19_1_1479141514810_9583">I =
have a table that has lot of tombstones generated and has caused inconsiste=
nt data across various datacenters. we run anti-entropy repairs and also ha=
ve read_repair_chance tuned-up during our non busy hours. But yet when we t=
ry to compare data residing in various replicas across DCs, we see inconsis=
tency.</div><div id=3D"m_4181975993583792143yui_3_16_0_ym19_1_1479141514810=
_9583"><br></div><div id=3D"m_4181975993583792143yui_3_16_0_ym19_1_14791415=
14810_9583">My question to the community is will tombstone cause issues in =
data consistency across the DCs.</div><div id=3D"m_4181975993583792143yui_3=
_16_0_ym19_1_1479141514810_9583"><br></div><div id=3D"m_4181975993583792143=
yui_3_16_0_ym19_1_1479141514810_9583">Thanks.</div></div></div></blockquote=
></div><br></div>

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