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Date: Thu, 28 Mar 2013 22:09:27 +0800
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 <CAOQaoyEcoJy-vWhFTwNd98+=HLK3F6acckRBwo-X6+kj4+gwSA@mail.gmail.com>
Subject: Re: Vnodes - HUNDRED of MapReduce jobs
From: Alicia Leong <lccalicia@gmail.com>
To: user@cassandra.apache.org
Cc: cassandra-user@incubator.apache.org
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Thanks Cem for your confirmation on this.

I guess, Login > Create Issue at
https://issues.apache.org/jira/browse/CASSANDRA


On Thu, Mar 28, 2013 at 9:40 PM, cem <cayiroglu@gmail.com> wrote:

> Hi Alicia ,
>
> Cassandra input format creates mappers as many as vnodes. It is a known
> issue. You need to lower the number of vnodes :(
>
> I have a simple solution for that and ready to write a patch. Should I
> create a ticket about that? I don't know the procedure about that.
>
>  Regards,
> Cem
>
>
> On Thu, Mar 28, 2013 at 2:30 PM, Alicia Leong <lccalicia@gmail.com> wrote:
>
>> Hi All,
>>
>> I have 3 nodes of Cassandra 1.2.3 & edited the cassandra.yaml for vnodes.
>>
>> When I execute a M/R job .. the console showed HUNDRED of Map tasks.
>>
>> May I know, is the normal since is vnodes?  If yes, this have slow the
>> M/R job to finish/complete.
>>
>>
>> Thanks
>>
>
>

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<div dir=3D"ltr"><div style>Thanks Cem for your confirmation on this.</div>=
<br><div style>I guess, Login &gt; Create Issue at=A0<a href=3D"https://iss=
ues.apache.org/jira/browse/CASSANDRA">https://issues.apache.org/jira/browse=
/CASSANDRA</a><br>
</div><div style><br></div><div style><br></div></div><div class=3D"gmail_e=
xtra"><br><br><div class=3D"gmail_quote">On Thu, Mar 28, 2013 at 9:40 PM, c=
em <span dir=3D"ltr">&lt;<a href=3D"mailto:cayiroglu@gmail.com" target=3D"_=
blank">cayiroglu@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Hi=A0Alicia=A0,<div><br></div><div>Cassandra=
 input format creates mappers as many as vnodes. It is a known issue. You n=
eed to lower the number of vnodes :(</div>
<div><br></div><div>I have a simple solution for that and ready to write a =
patch. Should I create a ticket about that? I=A0don&#39;t=A0know the proced=
ure about that.</div>
<div><br></div><div>=A0Regards,</div><div>Cem =A0<div><div class=3D"h5"><br=
><br><div class=3D"gmail_quote">On Thu, Mar 28, 2013 at 2:30 PM, Alicia Leo=
ng <span dir=3D"ltr">&lt;<a href=3D"mailto:lccalicia@gmail.com" target=3D"_=
blank">lccalicia@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi All,<div><br></div><div>=
I have 3 nodes of Cassandra 1.2.3 &amp; edited the cassandra.yaml for vnode=
s.</div>

<div><br></div><div>When I execute a M/R job .. the console showed HUNDRED =
of Map tasks.</div>
<div><br></div><div>May I know, is the normal since is vnodes? =A0If yes, t=
his have slow the M/R job to finish/complete.</div><div><br></div><div><br>=
</div><div>Thanks=A0</div></div>
</blockquote></div><br></div></div></div>
</blockquote></div><br></div>

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