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List: cassandra-user
Subject: =?UTF-8?B?UmU6IOWbnuWkje+8miBkYXRhIGxvc3MgaW4gZGlmZmVyZW50IERD?=
From: Reynald Bourtembourg <reynald.bourtembourg () esrf ! fr>
Date: 2017-09-28 16:51:55
Message-ID: 9084988f-ae34-ed0f-fce6-71f55c36af7b () esrf ! fr
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Do you mean how often we should run repairs in this situation (write at
CL=EACH_QUORUM and CL=LOCAL_QUORUM)?
I don't consider myself as an expert in this domain, so I will let the
real experts answer to this question...
You can also refer to this mailing list history (many threads on this
snbject) and to the recommendations in the documentation:
http://cassandra.apache.org/doc/latest/operating/repair.html#usage-and-best-practices
Kind regards
Reynald
On 28/09/2017 14:49, Jacob Shadix wrote:
> How often are you running repairs?
>
> -- Jacob Shadix
>
> On Thu, Sep 28, 2017 at 7:53 AM, Reynald Bourtembourg
> <reynald.bourtembourg@esrf.fr <mailto:reynald.bourtembourg@esrf.fr>>
> wrote:
>
> Hi,
>
> You can write with CL=EACH_QUORUM and read with CL=LOCAL_QUORUM to
> get strong consistency.
>
> Kind regards,
> Reynald
>
>
> On 28/09/2017 13:46, Peng Xiao wrote:
>> even with CL=QUORUM,there is no guarantee to be sure to read the
>> same data in DC2,right?
>> then multi DCs looks make no sense?
>>
>>
>> ------------------ 原始邮件 ------------------
>> *发件人:* "DuyHai Doan";<doanduyhai@gmail.com>
>> <mailto:doanduyhai@gmail.com>;
>> *发送时间:* 2017年9月28日(星期四) 下午5:45
>> *收件人:* "user"<user@cassandra.apache.org>
>> <mailto:user@cassandra.apache.org>;
>> *主题:* Re: data loss in different DC
>>
>> If you're writing into DC1 with CL = LOCAL_xxx, there is no
>> guarantee to be sure to read the same data in DC2. Only repair
>> will help you
>>
>> On Thu, Sep 28, 2017 at 11:41 AM, Peng Xiao <2535053@qq.com
>> <mailto:2535053@qq.com>> wrote:
>>
>> Dear All,
>>
>> We have a cluster with one DC1:RF=3,another DC DC2:RF=1 only
>> for ETL,but we found that sometimes we can query records in
>> DC1,while not able not find the same record in DC2 with
>> local_quorum.How it happens?
>> Could anyone please advise?
>> looks we can only run repair to fix it.
>>
>> Thanks,
>> Peng Xiao
>>
>>
>
>
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Do you mean how often we should run repairs in this situation (write
at CL=EACH_QUORUM and CL=LOCAL_QUORUM)?<br>
<br>
I don't consider myself as an expert in this domain, so I will let
the real experts answer to this question...<br>
You can also refer to this mailing list history (many threads on
this snbject) and to the recommendations in the documentation:<br>
<a class="moz-txt-link-freetext" \
href="http://cassandra.apache.org/doc/latest/operating/repair.html#usage-and-best-prac \
tices">http://cassandra.apache.org/doc/latest/operating/repair.html#usage-and-best-practices</a><br>
<br>
Kind regards<br>
Reynald<br>
<br>
<br>
<div class="moz-cite-prefix">On 28/09/2017 14:49, Jacob Shadix
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CA+u9BE7mPfo=PKQXGB7VbJCNhJ=Fp5wCXg6wf1by05iz+dd6rw@mail.gmail.com">
<div dir="ltr">How often are you running repairs?</div>
<div class="gmail_extra"><br clear="all">
<div>
<div class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr"><span
style="font-size:12.8000001907349px">-- Jacob
Shadix </span><br>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<div class="gmail_quote">On Thu, Sep 28, 2017 at 7:53 AM,
Reynald Bourtembourg <span dir="ltr"><<a
href="mailto:reynald.bourtembourg@esrf.fr" target="_blank"
moz-do-not-send="true">reynald.bourtembourg@esrf.fr</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> Hi,<br>
<br>
You can write with CL=EACH_QUORUM and read with
CL=LOCAL_QUORUM to get strong consistency.<br>
<br>
Kind regards,<br>
Reynald
<div>
<div class="h5"><br>
<br>
<div class="m_-6166422026026731157moz-cite-prefix">On
28/09/2017 13:46, Peng Xiao wrote:<br>
</div>
<blockquote type="cite">
<div>even with CL=QUORUM,there is no guarantee to be
sure to read the same data in DC2,right?</div>
<div>then multi DCs looks make no sense?</div>
<div>
<div><br>
</div>
<div><br>
</div>
<div style="font-size:12px;font-family:Arial
Narrow;padding:2px 0 2px 0">------------------ 原始邮件 \
------<wbr>------------</div> <div
style="font-size:12px;background:#efefef;padding:8px">
<div><b>发件人:</b> "DuyHai Doan";<a
class="m_-6166422026026731157moz-txt-link-rfc2396E"
href="mailto:doanduyhai@gmail.com"
target="_blank" \
moz-do-not-send="true"><doanduyhai@gmail.com></a>;</div> <div><b>发送时间:</b> \
2017年9月28日(星期四) 下午5:45</div> <div><b>收件人:</b> "user"<a
class="m_-6166422026026731157moz-txt-link-rfc2396E"
href="mailto:user@cassandra.apache.org"
target="_blank" \
moz-do-not-send="true"><user@cassandra.<wbr>apache.org></a>;</div>
<div><b>主题:</b> Re: data loss in different DC</div>
</div>
<div><br>
</div>
<div dir="ltr">If you're writing into DC1 with CL
= LOCAL_xxx, there is no guarantee to be sure to
read the same data in DC2. Only repair will help
you</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Sep 28, 2017 at
11:41 AM, Peng Xiao <span dir="ltr"><<a
href="mailto:2535053@qq.com"
target="_blank" \
moz-do-not-send="true">2535053@qq.com</a>></span> wrote:<br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex">
<div>Dear All,</div>
<div><br>
</div>
<div>We have a cluster with one
DC1:RF=3,another DC DC2:RF=1 only for
ETL,but we found that sometimes we can
query records in DC1,while not able not
find the same record in DC2 with
local_quorum.How it happens?</div>
<div>Could anyone please advise?</div>
<div>looks we can only run repair to fix it.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Peng Xiao</div>
</blockquote>
</div>
<br>
</div>
</div>
</blockquote>
<br>
</div>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
</body>
</html>
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