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Subject: What is the preferred way to pass a small number of configuration
 parameters to a mapper or reducer
From: Kshiva Kps <kshivakps@gmail.com>
To: user@hadoop.apache.org
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Which one is current ..


What is the preferred way to pass a small number of configuration
parameters to a mapper or reducer?





*A.  *As key-value pairs in the jobconf object.

* *

*B.  *As a custom input key-value pair passed to each mapper or reducer.

* *

*C.  *Using a plain text file via the Distributedcache, which each mapper
or reducer reads.

* *

*D.  *Through a static variable in the MapReduce driver class (i.e., the
class that submits the MapReduce job).



*Answer: B*

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<span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:17.0pt;m=
argin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;line-height:115%;tex=
t-autospace:none"><span style=3D"background-color:rgb(255,255,255)"><span s=
tyle=3D"font-size:12pt;line-height:115%;font-family:&quot;Arial&quot;,&quot=
;sans-serif&quot;;color:black;background-image:none;background-repeat:repea=
t"><br>
</span></span></p><p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-rig=
ht:17.0pt;margin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;line-heig=
ht:115%;text-autospace:none"><span style=3D"background-color:rgb(255,255,25=
5)"><span style=3D"font-size:12pt;line-height:115%;font-family:&quot;Arial&=
quot;,&quot;sans-serif&quot;;color:black;background-image:none;background-r=
epeat:repeat">Which one is current ..<br>
</span></span></p><p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-rig=
ht:17.0pt;margin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;line-heig=
ht:115%;text-autospace:none"><span style=3D"background-color:rgb(255,255,25=
5)"><span style=3D"font-size:12pt;line-height:115%;font-family:&quot;Arial&=
quot;,&quot;sans-serif&quot;;color:black;background-image:none;background-r=
epeat:repeat"><br>
</span></span></p><p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-rig=
ht:17.0pt;margin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;line-heig=
ht:115%;text-autospace:none"><span style=3D"background-color:rgb(255,255,25=
5)"><span style=3D"font-size:12pt;line-height:115%;font-family:&quot;Arial&=
quot;,&quot;sans-serif&quot;;color:black;background-image:none;background-r=
epeat:repeat">What is the preferred way to pass
a small number of configuration parameters to a mapper or reducer?</span><s=
pan style=3D"font-size:12pt;line-height:115%;font-family:&quot;Times New Ro=
man&quot;,&quot;serif&quot;;background-image:none;background-repeat:repeat"=
></span></span></p>
<span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.000=
1pt;line-height:10.0pt;text-autospace:none"><span style=3D"background-color=
:rgb(255,255,255)"><span style=3D"font-size:12pt;font-family:&quot;Times Ne=
w Roman&quot;,&quot;serif&quot;;background-image:none;background-repeat:rep=
eat">=A0</span></span></p>
<span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.000=
1pt;line-height:14.05pt;text-autospace:none"><span style=3D"background-colo=
r:rgb(255,255,255)"><span style=3D"font-size:12pt;font-family:&quot;Times N=
ew Roman&quot;,&quot;serif&quot;;background-image:none;background-repeat:re=
peat">=A0</span></span></p>
<span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;marg=
in-bottom:0cm;margin-left:15.0pt;margin-bottom:.0001pt;text-align:justify;t=
ext-justify:inter-ideograph;line-height:normal;text-autospace:none"><span s=
tyle=3D"background-color:rgb(255,255,255)"><b><span style=3D"font-size:12pt=
;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black;backgroun=
d-image:none;background-repeat:repeat"><span style>A.<span style=3D"font:7.=
0pt &quot;Times New Roman&quot;">=A0 </span></span></span></b><span style=
=3D"font-size:12pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;col=
or:black;background-image:none;background-repeat:repeat">As key-value pairs=
 in the jobconf object. </span></span></p>
<span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.000=
1pt;line-height:2.2pt;text-autospace:none"><span style=3D"background-color:=
rgb(255,255,255)"><b><span style=3D"font-size:12pt;font-family:&quot;Arial&=
quot;,&quot;sans-serif&quot;;color:black;background-image:none;background-r=
epeat:repeat">=A0</span></b></span></p>
<span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;marg=
in-bottom:0cm;margin-left:15.0pt;margin-bottom:.0001pt;text-align:justify;t=
ext-justify:inter-ideograph;line-height:normal;text-autospace:none"><span s=
tyle=3D"background-color:rgb(255,255,255)"><b><span style=3D"font-size:12pt=
;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black;backgroun=
d-image:none;background-repeat:repeat"><span style>B.<span style=3D"font:7.=
0pt &quot;Times New Roman&quot;">=A0 </span></span></span></b><span style=
=3D"font-size:12pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;col=
or:black;background-image:none;background-repeat:repeat">As a custom input =
key-value pair passed to
each mapper or reducer. </span></span></p><span style=3D"background-color:r=
gb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.000=
1pt;line-height:2.2pt;text-autospace:none"><span style=3D"background-color:=
rgb(255,255,255)"><b><span style=3D"font-size:12pt;font-family:&quot;Arial&=
quot;,&quot;sans-serif&quot;;color:black;background-image:none;background-r=
epeat:repeat">=A0</span></b></span></p>
<span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;marg=
in-bottom:0cm;margin-left:15.0pt;margin-bottom:.0001pt;text-align:justify;t=
ext-justify:inter-ideograph;line-height:normal;text-autospace:none"><span s=
tyle=3D"background-color:rgb(255,255,255)"><b><span style=3D"font-size:12pt=
;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black;backgroun=
d-image:none;background-repeat:repeat"><span style>C.<span style=3D"font:7.=
0pt &quot;Times New Roman&quot;">=A0 </span></span></span></b><span style=
=3D"font-size:12pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;col=
or:black;background-image:none;background-repeat:repeat">Using a plain text=
 file via the
Distributedcache, which each mapper or reducer reads. </span></span></p><sp=
an style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.000=
1pt;line-height:2.2pt;text-autospace:none"><span style=3D"background-color:=
rgb(255,255,255)"><b><span style=3D"font-size:12pt;font-family:&quot;Arial&=
quot;,&quot;sans-serif&quot;;color:black;background-image:none;background-r=
epeat:repeat">=A0</span></b></span></p>
<span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:35.0pt;m=
argin-bottom:0cm;margin-left:0cm;margin-bottom:.0001pt;text-align:justify;t=
ext-justify:inter-ideograph;text-indent:0cm;line-height:115%;text-autospace=
:none">
<span style=3D"background-color:rgb(255,255,255)"><b><span style=3D"font-si=
ze:12pt;line-height:115%;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;color:black;background-image:none;background-repeat:repeat"><span style>=
D.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=A0 </span></span>=
</span></b><span style=3D"font-size:12pt;line-height:115%;font-family:&quot=
;Arial&quot;,&quot;sans-serif&quot;;color:black;background-image:none;backg=
round-repeat:repeat">Through a static variable in the
MapReduce driver class (i.e., the class that submits the MapReduce job). </=
span></span></p><span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.000=
1pt;line-height:13.65pt;text-autospace:none"><span style=3D"background-colo=
r:rgb(255,255,255)"><span style=3D"font-size:12pt;font-family:&quot;Times N=
ew Roman&quot;,&quot;serif&quot;;background-image:none;background-repeat:re=
peat">=A0</span></span></p>
<span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.000=
1pt;line-height:normal;text-autospace:none"><span style=3D"background-color=
:rgb(255,255,255)"><b><span style=3D"font-size:12pt;font-family:&quot;Arial=
&quot;,&quot;sans-serif&quot;;color:black;background-image:none;background-=
repeat:repeat">Answer: B</span></b><span style=3D"font-size:12pt;font-famil=
y:&quot;Times New Roman&quot;,&quot;serif&quot;;background-image:none;backg=
round-repeat:repeat"></span></span></p>
<span style=3D"background-color:rgb(255,255,255)">

</span><p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.000=
1pt;line-height:4.2pt;text-autospace:none"><span style=3D"background-color:=
rgb(255,255,255)"><span style=3D"font-size:12pt;font-family:&quot;Times New=
 Roman&quot;,&quot;serif&quot;;background-image:none;background-repeat:repe=
at">=A0</span></span></p>
<span style=3D"background-color:rgb(255,255,255)">

</span>

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