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 <CAGZOQ8NcvSrSZ79CDAxJ5akYd+JZgbRDOasH_1GMOZ+f9xJpBA@mail.gmail.com>
Subject: change cache path
From: Mohit Vadhera <project.linux.proj@gmail.com>
To: "<user@hadoop.apache.org>" <user@hadoop.apache.org>
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--047d7b34308896599304da9c313b
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Hi,

I want to change cache path because i don't have much space in my root /
fs. I want to change path for hadoop cache files to be create on external
drives. It is standalone hadoop cluster and it is running more than a year.
I want the changes so that it should not effect the running machine. I
don't want to format hdfs also. Below is the configuration. Can i give any
path and restart the services ?

<configuration>
  <property>
    <name>dfs.replication</name>
    <value>1</value>
  </property>
  <!-- Immediately exit safemode as soon as one DataNode checks in.
       On a multi-node cluster, these configurations must be removed.  -->
  <property>
    <name>dfs.safemode.extension</name>
    <value>0</value>
  </property>
  <property>
     <name>dfs.safemode.min.datanodes</name>
     <value>1</value>
  </property>
  <property>
     <name>hadoop.tmp.dir</name>
     <value>/var/lib/hadoop-hdfs/cache/${user.name}</value>
  </property>
  <property>
     <name>dfs.namenode.name.dir</name>
     <value>/var/lib/hadoop-hdfs/cache/${user.name}/dfs/name</value>
  </property>
  <property>
     <name>dfs.namenode.checkpoint.dir</name>
     <value>/var/lib/hadoop-hdfs/cache/${user.name
}/dfs/namesecondary</value>
  </property>
  <property>
     <name>dfs.datanode.data.dir</name>
<!--     <value>/var/lib/hadoop-hdfs/cache/${user.name}/dfs/data</value> -->
  <value>/mnt/san1/hdfs/${user.name}/dfs/data,/mnt/san2/hdfs/${user.name
}/dfs/data,/mnt/san3/hdfs/${user.name}/dfs/data,/mnt/san4/hdfs/${user.name
}/dfs/data</value>
  </property>
  <property>
      <name>dfs.permissions.supergroup</name>
      <value>hadmin</value>
  </property>
</configuration>

Thanks,

--047d7b34308896599304da9c313b
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><div>Hi,<br><br></div>I want to change cache path bec=
ause i don&#39;t have much space in my root / fs. I want to change path for=
 hadoop cache files to be create on external drives. It is standalone hadoo=
p cluster and it is running more than a year. I want the changes so that it=
 should not effect the running machine. I don&#39;t want to format hdfs als=
o. Below is the configuration. Can i give any path and restart the services=
 ?<br>
<br>&lt;configuration&gt;<br>=A0 &lt;property&gt;<br>=A0=A0=A0 &lt;name&gt;=
dfs.replication&lt;/name&gt;<br>=A0=A0=A0 &lt;value&gt;1&lt;/value&gt;<br>=
=A0 &lt;/property&gt;<br>=A0 &lt;!-- Immediately exit safemode as soon as o=
ne DataNode checks in.<br>
=A0=A0=A0=A0=A0=A0 On a multi-node cluster, these configurations must be re=
moved.=A0 --&gt;<br>=A0 &lt;property&gt;<br>=A0=A0=A0 &lt;name&gt;dfs.safem=
ode.extension&lt;/name&gt;<br>=A0=A0=A0 &lt;value&gt;0&lt;/value&gt;<br>=A0=
 &lt;/property&gt;<br>=A0 &lt;property&gt;<br>
=A0=A0=A0=A0 &lt;name&gt;dfs.safemode.min.datanodes&lt;/name&gt;<br>=A0=A0=
=A0=A0 &lt;value&gt;1&lt;/value&gt;<br>=A0 &lt;/property&gt;<br>=A0 &lt;pro=
perty&gt;<br>=A0=A0=A0=A0 &lt;name&gt;hadoop.tmp.dir&lt;/name&gt;<br>=A0=A0=
=A0=A0 &lt;value&gt;/var/lib/hadoop-hdfs/cache/${<a href=3D"http://user.nam=
e">user.name</a>}&lt;/value&gt;<br>
=A0 &lt;/property&gt;<br>=A0 &lt;property&gt;<br>=A0=A0=A0=A0 &lt;name&gt;d=
fs.namenode.name.dir&lt;/name&gt;<br>=A0=A0=A0=A0 &lt;value&gt;/var/lib/had=
oop-hdfs/cache/${<a href=3D"http://user.name">user.name</a>}/dfs/name&lt;/v=
alue&gt;<br>=A0 &lt;/property&gt;<br>
=A0 &lt;property&gt;<br>=A0=A0=A0=A0 &lt;name&gt;dfs.namenode.checkpoint.di=
r&lt;/name&gt;<br>=A0=A0=A0=A0 &lt;value&gt;/var/lib/hadoop-hdfs/cache/${<a=
 href=3D"http://user.name">user.name</a>}/dfs/namesecondary&lt;/value&gt;<b=
r>=A0 &lt;/property&gt;<br>
=A0 &lt;property&gt;<br>=A0=A0=A0=A0 &lt;name&gt;dfs.datanode.data.dir&lt;/=
name&gt;<br>&lt;!--=A0=A0=A0=A0 &lt;value&gt;/var/lib/hadoop-hdfs/cache/${<=
a href=3D"http://user.name">user.name</a>}/dfs/data&lt;/value&gt; --&gt;<br=
>=A0 &lt;value&gt;/mnt/san1/hdfs/${<a href=3D"http://user.name">user.name</=
a>}/dfs/data,/mnt/san2/hdfs/${<a href=3D"http://user.name">user.name</a>}/d=
fs/data,/mnt/san3/hdfs/${<a href=3D"http://user.name">user.name</a>}/dfs/da=
ta,/mnt/san4/hdfs/${<a href=3D"http://user.name">user.name</a>}/dfs/data&lt=
;/value&gt;<br>
=A0 &lt;/property&gt;<br>=A0 &lt;property&gt;<br>=A0=A0=A0=A0=A0 &lt;name&g=
t;dfs.permissions.supergroup&lt;/name&gt;<br>=A0=A0=A0=A0=A0 &lt;value&gt;h=
admin&lt;/value&gt;<br>=A0 &lt;/property&gt;<br>&lt;/configuration&gt;<br><=
br></div>Thanks,<br><br>
</div>

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