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Message-ID: <1365755432.10219.YahooMailNeo@web190701.mail.sg3.yahoo.com>
Date: Fri, 12 Apr 2013 16:30:32 +0800 (SGT)
From: Sai Sai <saigraph@yahoo.in>
Reply-To: Sai Sai <saigraph@yahoo.in>
Subject: Re: Will HDFS refer to the memory of NameNode & DataNode or is it a
 separate machine
To: "user@hadoop.apache.org" <user@hadoop.apache.org>
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A few basic questions:=0A=0AWill HDFS refer to the memory of NameNode & Dat=
aNode or is it a separate machine.=0A=0A=0AFor NameNode, DataNode and other=
s there is a process associated with each of em.=0ABut no process is for HD=
FS, wondering why? I understand that fsImage has the meta data of the HDFS,=
 so when NameNode or DataNode or JobTracker/TT needs to get file info will =
they just look into the fsImage.=0A=0AWhen we put a file in HDFS is it poss=
ible to look/find in which node (NN/DN) it physically sits.=0A=0AAny help i=
s appreciated.=0AThanks=0ASai
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ti=
mes new roman, new york, times, serif;font-size:12pt"><div>A few basic ques=
tions:</div><div><br></div><div style=3D"color: rgb(0, 0, 0); font-size: 16=
px; font-family: 'times new roman', 'new york', times, serif; background-co=
lor: transparent; font-style: normal; ">Will HDFS refer to the memory of Na=
meNode &amp; DataNode or is it a separate machine.<br></div><div style=3D"c=
olor: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new y=
ork', times, serif; background-color: transparent; font-style: normal; "><b=
r></div><div style=3D"color: rgb(0, 0, 0); font-size: 16px; font-family: 't=
imes new roman', 'new york', times, serif; background-color: transparent; f=
ont-style: normal; ">For NameNode, DataNode and others there is a process a=
ssociated with each of em.</div><div style=3D"color: rgb(0, 0, 0); font-siz=
e: 16px; font-family: 'times new roman', 'new york', times, serif;
 background-color: transparent; font-style: normal; ">But no process is for=
 HDFS, wondering why? I understand that fsImage has the meta data of the HD=
FS, so when NameNode or DataNode or JobTracker/TT needs to get file info wi=
ll they just look into the fsImage.</div><div style=3D"color: rgb(0, 0, 0);=
 font-size: 16px; font-family: 'times new roman', 'new york', times, serif;=
 background-color: transparent; font-style: normal; "><br></div><div style=
=3D"color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', '=
new york', times, serif; background-color: transparent; font-style: normal;=
 ">When we put a file in HDFS is it possible to look/find in which node (NN=
/DN) it physically sits.</div><div style=3D"color: rgb(0, 0, 0); font-size:=
 16px; font-family: 'times new roman', 'new york', times, serif; background=
-color: transparent; font-style: normal; "><br></div><div style=3D"color: r=
gb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york',
 times, serif; background-color: transparent; font-style: normal; ">Any hel=
p is appreciated.</div><div style=3D"color: rgb(0, 0, 0); font-size: 16px; =
font-family: 'times new roman', 'new york', times, serif; background-color:=
 transparent; font-style: normal; ">Thanks</div><div style=3D"color: rgb(0,=
 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times,=
 serif; background-color: transparent; font-style: normal; ">Sai</div>  </d=
iv></body></html>
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