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From: Omer Holzinger <omer.holz@gmail.com>
Date: Tue, 5 Aug 2014 13:18:44 -0400
Message-ID: 
 <CAD5WQtqzGievXtQPW7kEEdYT6L1c9s8=JWyJA4ZAMGWSG0P_wg@mail.gmail.com>
Subject: graph reduceByKey
To: user@spark.apache.org
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--047d7bb708a89973ac04ffe50ec7
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Hey all!

I'm a total beginner with spark / hadoop / graph computation so please
excuse my beginner question.

I've created a graph, using graphx. Now, for every vertex, I want to get
all its second degree neighbors.
so if my graph is:
v1 --> v2
v1 --> v4
v1 --> v6

I want to get something like:
v2 --> v4
v2 --> v6
v4 --> v2
v4 --> v6
v6 --> v2
v6 --> v4

Does anyone have advice on what will be the best way to do that over a
graph instance?
I attempted to do it using mapReduceTriplets but I need the reduce function
to work like reduceByKey, which I wasn't able to do.

Thank you.

  -- Omer

--047d7bb708a89973ac04ffe50ec7
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small;colo=
r:rgb(0,0,153)">Hey all!</div><div class=3D"gmail_default" style=3D"font-si=
ze:small;color:rgb(0,0,153)"><br></div><div class=3D"gmail_default" style=
=3D"font-size:small;color:rgb(0,0,153)">

I&#39;m a total beginner with spark / hadoop / graph computation so please =
excuse my beginner question.</div><div class=3D"gmail_default" style=3D"fon=
t-size:small;color:rgb(0,0,153)"><br></div><div class=3D"gmail_default" sty=
le=3D"font-size:small;color:rgb(0,0,153)">

I&#39;ve created a graph, using graphx. Now, for every vertex, I want to ge=
t all its second degree neighbors.</div><div class=3D"gmail_default" style=
=3D"font-size:small;color:rgb(0,0,153)">so if my graph is:</div><div class=
=3D"gmail_default" style=3D"font-size:small;color:rgb(0,0,153)">

v1 --&gt; v2</div><div class=3D"gmail_default" style=3D"font-size:small;col=
or:rgb(0,0,153)">v1 --&gt; v4</div><div class=3D"gmail_default" style=3D"fo=
nt-size:small;color:rgb(0,0,153)">v1 --&gt; v6</div><div class=3D"gmail_def=
ault" style=3D"font-size:small;color:rgb(0,0,153)">

<br></div><div class=3D"gmail_default" style=3D"font-size:small;color:rgb(0=
,0,153)">I want to get something like:</div><div class=3D"gmail_default" st=
yle=3D"font-size:small;color:rgb(0,0,153)">v2 --&gt; v4</div><div class=3D"=
gmail_default" style=3D"font-size:small;color:rgb(0,0,153)">

v2 --&gt; v6</div><div class=3D"gmail_default" style=3D"font-size:small;col=
or:rgb(0,0,153)">v4 --&gt; v2</div><div class=3D"gmail_default" style=3D"fo=
nt-size:small;color:rgb(0,0,153)">v4 --&gt; v6</div><div class=3D"gmail_def=
ault" style=3D"font-size:small;color:rgb(0,0,153)">

v6 --&gt; v2</div><div class=3D"gmail_default" style=3D"font-size:small;col=
or:rgb(0,0,153)">v6 --&gt; v4</div><div class=3D"gmail_default" style=3D"fo=
nt-size:small;color:rgb(0,0,153)"><br></div><div class=3D"gmail_default" st=
yle=3D"font-size:small;color:rgb(0,0,153)">

Does anyone have advice on what will be the best way to do that over a grap=
h instance?<br></div><div class=3D"gmail_default" style=3D"font-size:small;=
color:rgb(0,0,153)">I attempted to do it using=C2=A0mapReduceTriplets but I=
 need the reduce function to work like reduceByKey, which I wasn&#39;t able=
 to do.</div>

<div class=3D"gmail_default" style=3D"font-size:small;color:rgb(0,0,153)"><=
br></div><div class=3D"gmail_default" style=3D"font-size:small;color:rgb(0,=
0,153)">Thank you.</div><div class=3D"gmail_default" style=3D"font-size:sma=
ll;color:rgb(0,0,153)">

<br></div><div class=3D"gmail_default" style=3D"font-size:small;color:rgb(0=
,0,153)">=C2=A0 -- Omer</div><div class=3D"gmail_default" style=3D"font-siz=
e:small;color:rgb(0,0,153)"><br></div><div class=3D"gmail_default" style=3D=
"font-size:small;color:rgb(0,0,153)">

<br></div></div>

--047d7bb708a89973ac04ffe50ec7--