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From: kurt greaves <kurt@instaclustr.com>
Date: Tue, 19 Sep 2017 04:34:50 +0000
Message-ID: <CAPbVhuO5Ww3GMH92Qu_86bYEEVPZDkvxQOXouYbyqt9EouTesQ@mail.gmail.com>
Subject: Re: ConsitencyLevel and Mutations : Behaviour if the update of the
 commitlog fails
To: User <user@cassandra.apache.org>
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archived-at: Tue, 19 Sep 2017 04:35:38 -0000

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> =E2=80=8BDoes the coordinator "cancel" the mutation on the "committed" no=
des (and
> how)?

No. Those mutations are applied on those nodes.

>  Is it an heuristic case where two nodes have the data whereas they
> shouldn't and we hope that HintedHandoff will replay the mutation ?

Yes. But really you should make sure you recover from this error in your
client. Hinted handoff might work, but you have no way of knowing if it has
taken place so if ALL is important you should retry/resolve the failed
query accordingly.

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<div dir=3D"ltr"><br><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=E2=
=80=8BDoes the coordinator &quot;cancel&quot; the mutation on the &quot;com=
mitted&quot; nodes (and how)?=C2=A0</blockquote><div>No. Those mutations ar=
e applied on those nodes.</div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left=
:1ex">=C2=A0<span style=3D"font-size:12.8px">Is it an heuristic case where =
two nodes have the data whereas they shouldn&#39;t and we hope that HintedH=
andoff will replay the mutation ?</span></blockquote><div><span style=3D"fo=
nt-size:12.8px">Yes. But really you should make sure you recover from this =
error in your client. Hinted handoff might work, but you have no way of kno=
wing if it has taken place so if ALL is important you should retry/resolve =
the failed query accordingly.</span></div></div>

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