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Subject: Re: High read latency after data volume increased
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Date: Fri, 9 Jan 2015 09:03:11 -0500
To: "user@cassandra.apache.org" <user@cassandra.apache.org>
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Hello

  You may not be experiencing versioning issues.   Do you know if compaction=
 is keeping up with your workload?  The behavior described in the subject is=
 typically associated with compaction falling behind or having a suboptimal c=
ompaction strategy configured.   What does the output of nodetool cfhistogra=
ms <keyspace> <table> look like for a table that is experiencing this issue?=
  Also, what type of disks are you using on the nodes?

Sent from my iPad

> On Jan 9, 2015, at 8:55 AM, Brian Tarbox <briantarbox@gmail.com> wrote:
>=20
> C* seems to have more than its share of "version x doesn't work, use versi=
on y " type issues....
>=20
>> On Thu, Jan 8, 2015 at 2:23 PM, Robert Coli <rcoli@eventbrite.com> wrote:=

>>> On Thu, Jan 8, 2015 at 11:14 AM, Roni Balthazar <ronibalthazar@gmail.com=
> wrote:
>>> We are using C* 2.1.2 with 2 DCs. 30 nodes DC1 and 10 nodes DC2.
>>=20
>> https://engineering.eventbrite.com/what-version-of-cassandra-should-i-run=
/
>>=20
>> 2.1.2 in particular is known to have significant issues. You'd be better o=
ff running 2.1.1 ...
>>=20
>> =3DRob
>=20
>=20
>=20
> --=20
> http://about.me/BrianTarbox

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>Hello</div><div><br></div><div>&nbsp; Y=
ou may not be experiencing versioning issues. &nbsp; Do you know if compacti=
on is keeping up with your workload? &nbsp;The behavior described in the sub=
ject is typically associated with compaction falling behind or having a subo=
ptimal compaction strategy configured. &nbsp; What does the output of nodeto=
ol cfhistograms &lt;keyspace&gt; &lt;table&gt; look like for a table that is=
 experiencing this issue? &nbsp;Also, what type of disks are you using on th=
e nodes?<br><br>Sent from my iPad</div><div><br>On Jan 9, 2015, at 8:55 AM, B=
rian Tarbox &lt;<a href=3D"mailto:briantarbox@gmail.com">briantarbox@gmail.c=
om</a>&gt; wrote:<br><br></div><blockquote type=3D"cite"><div><div dir=3D"lt=
r">C* seems to have more than its share of "version x doesn't work, use vers=
ion y " type issues....</div><div class=3D"gmail_extra"><br><div class=3D"gm=
ail_quote">On Thu, Jan 8, 2015 at 2:23 PM, Robert Coli <span dir=3D"ltr">&lt=
;<a href=3D"mailto:rcoli@eventbrite.com" target=3D"_blank">rcoli@eventbrite.=
com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"marg=
in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">=
<div class=3D"gmail_extra"><div class=3D"gmail_quote"><span class=3D"">On Th=
u, Jan 8, 2015 at 11:14 AM, Roni Balthazar <span dir=3D"ltr">&lt;<a href=3D"=
mailto:ronibalthazar@gmail.com" target=3D"_blank">ronibalthazar@gmail.com</a=
>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px=
 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);bord=
er-left-style:solid;padding-left:1ex">We are using C* 2.1.2 with 2 DCs. 30 n=
odes DC1 and 10 nodes DC2.<br></blockquote><div><br></div></span><div><a hre=
f=3D"https://engineering.eventbrite.com/what-version-of-cassandra-should-i-r=
un/" target=3D"_blank">https://engineering.eventbrite.com/what-version-of-ca=
ssandra-should-i-run/</a></div><div><br></div><div>2.1.2 in particular is kn=
own to have significant issues. You'd be better off running 2.1.1 ...</div><=
div><br></div><div>=3DRob</div><div>&nbsp;</div></div></div></div>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=3D=
"gmail_signature"><a href=3D"http://about.me/BrianTarbox" target=3D"_blank">=
http://about.me/BrianTarbox</a></div>
</div>
</div></blockquote></body></html>=

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