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Date: Mon, 6 Jun 2011 13:08:30 -0700 (PDT)
From: Ayon Sinha <ayonsinha@yahoo.com>
Reply-To: Ayon Sinha <ayonsinha@yahoo.com>
Subject: Re: Changing dfs.block.size
To: "hdfs-user@hadoop.apache.org" <hdfs-user@hadoop.apache.org>
In-Reply-To: <BANLkTinK9S_nGXGJ=MUEPd=Sa0hb0AV3+g@mail.gmail.com>
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=A0Do newly created files get the default blocksize and old files remain th=
e same? Yes=0A=0AIs there a way to change the blocksize of existing files? =
I have done this using copy-out and copy back in script. Couldn't find a sh=
ort-cut analogous to setrep.=0A=0A=A0=0A-Ayon=0ASee My Photos on Flickr=0AA=
lso check out my Blog for answers to commonly asked questions.=0A=0A=0A=0A_=
_______________________________=0AFrom: J. Ryan Earl <oss@jryanearl.us>=0AT=
o: hdfs-user@hadoop.apache.org=0ASent: Monday, June 6, 2011 12:09 PM=0ASubj=
ect: Changing dfs.block.size=0A=0A=0AHello,=0A=0ASo I have a question about=
 changing dfs.block.size in $HADOOP_HOME/conf/hdfs-site.xml. =A0I understan=
d that when files are created, blocksizes can be modified from default. =A0=
What happens if you modify the blocksize of an existing HDFS site? =A0Do ne=
wly created files get the default blocksize and old files remain the same? =
=A0Is there a way to change the blocksize of existing files; I'm assuming y=
ou could write MapReduce job to do it, but any build in facilities?=0A=0ATh=
anks,=0A-JR
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ar=
ial, helvetica, sans-serif;font-size:10pt"><div><span><meta charset=3D"utf-=
8"><span class=3D"Apple-style-span" style=3D"font-family: 'times new roman'=
, 'new york', times, serif; font-size: 16px; ">&nbsp;Do newly created files=
 get the default blocksize and old files remain the same? Yes</span><br></s=
pan></div><div><span><span class=3D"Apple-style-span" style=3D"font-family:=
 'times new roman', 'new york', times, serif; font-size: 16px; "><meta char=
set=3D"utf-8">Is there a way to change the blocksize of existing files? I h=
ave done this using copy-out and copy back in script. Couldn't find a short=
-cut analogous to setrep.<br></span></span></div><div>&nbsp;</div><div>-Ayo=
n<br><a rel=3D"nofollow" target=3D"_blank" href=3D"http://www.flickr.com/ph=
otos/ayonsinha/">See My Photos on Flickr</a><br><a rel=3D"nofollow" target=
=3D"_blank" href=3D"http://dailyadvisor.blogspot.com">Also check out my Blo=
g for answers to
 commonly asked questions.</a><br><br></div><div style=3D"font-size: 10pt; =
font-family: arial, helvetica, sans-serif; "><div style=3D"font-size: 12pt;=
 font-family: 'times new roman', 'new york', times, serif; "><font size=3D"=
2" face=3D"Arial"><hr size=3D"1"><b><span style=3D"font-weight:bold;">From:=
</span></b> J. Ryan Earl &lt;oss@jryanearl.us&gt;<br><b><span style=3D"font=
-weight: bold;">To:</span></b> hdfs-user@hadoop.apache.org<br><b><span styl=
e=3D"font-weight: bold;">Sent:</span></b> Monday, June 6, 2011 12:09 PM<br>=
<b><span style=3D"font-weight: bold;">Subject:</span></b> Changing dfs.bloc=
k.size<br></font><br>=0A<div id=3D"yiv239458888">Hello,<div><br></div><div>=
So I have a question about changing dfs.block.size in $HADOOP_HOME/conf/hdf=
s-site.xml. &nbsp;I understand that when files are created, blocksizes can =
be modified from default. &nbsp;What happens if you modify the blocksize of=
 an existing HDFS site? &nbsp;Do newly created files get the default blocks=
ize and old files remain the same? &nbsp;Is there a way to change the block=
size of existing files; I'm assuming you could write MapReduce job to do it=
, but any build in facilities?</div>=0A<div><br></div><div>Thanks,</div><di=
v>-JR</div><div><br></div><div><br></div>=0A</div><br><br></div></div></div=
></body></html>
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