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 <CAO3KVEdZ_Vyo-5FE8XSsmcx-5kz-Px8qQ1fhdcqEXPKUtkdYHQ@mail.gmail.com>
Subject: hadoop cares about /etc/hosts ?
From: Cipher Chen <cipher.chen2012@gmail.com>
To: user@hadoop.apache.org
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--089e0149396428de0e04e5f1b9a9
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

Hi everyone,
  I have solved a configuration problem due to myself in hadoop cluster
mode.

I have configuration as below:

  <property>
    <name>fs.default.name</name>
    <value>hdfs://master:54310</value>
  </property>

a
=E2=80=8Bnd the hosts file:=E2=80=8B


/etc/hosts:
127.0.0.1       localhost
=E2=80=8B=E2=80=8B
=E2=80=8B=E2=80=8B
192.168.6.10    localhost
=E2=80=8B###=E2=80=8B

192.168.6.10    tulip master
192.168.6.5     violet slave

=E2=80=8Ba
=E2=80=8Bnd when i was trying to start-dfs.sh, namenode failed to start.=E2=
=80=8B


=E2=80=8Bnamenode log hinted that:
13/09/09 17:09:02 INFO namenode.NameNode: Namenode up at: localhost/
192.168.6.10:54310
...
13/09/09 17:09:10 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:54310. Already tried 0 time(s); retry policy is
RetryUpToMaximumCountWithF>
13/09/09 17:09:11 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:54310. Already tried 1 time(s); retry policy is
RetryUpToMaximumCountWithF>
13/09/09 17:09:12 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:54310. Already tried 2 time(s); retry policy is
RetryUpToMaximumCountWithF>
13/09/09 17:09:13 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:54310. Already tried 3 time(s); retry policy is
RetryUpToMaximumCountWithF>
13/09/09 17:09:14 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:54310. Already tried 4 time(s); retry policy is
RetryUpToMaximumCountWithF>
13/09/09 17:09:15 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:54310. Already tried 5 time(s); retry policy is
RetryUpToMaximumCountWithF>
13/09/09 17:09:16 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:54310. Already tried 6 time(s); retry policy is
RetryUpToMaximumCountWithF>
13/09/09 17:09:17 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:54310. Already tried 7 time(s); retry policy is
RetryUpToMaximumCountWithF>
13/09/09 17:09:18 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:54310. Already tried 8 time(s); retry policy is
RetryUpToMaximumCountWithF>
13/09/09 17:09:19 INFO ipc.Client: Retrying connect to server: localhost/
127.0.0.1:54310. Already tried 9 time(s); retry policy is
RetryUpToMaximumCountWithF>
...

Now I know deleting the line "=E2=80=8B192.168.6.10    localhost  ###
=E2=80=8B
=E2=80=8B=E2=80=8B"
=E2=80=8B would fix this.
But I still don't know=E2=80=8B

=E2=80=8Bwhy hadoop would resolve "master" to "localhost/127.0.0.1."=E2=80=
=8B


=E2=80=8BSeems http://blog.devving.com/why-does-hbase-care-about-etchosts/ =
explains
this,
I'm not quite sure.=E2=80=8B
I=E2=80=8Bs there any
 other=E2=80=8B
explanation to this?

Thanks.=E2=80=8B


--=20
Cipher Chen

--089e0149396428de0e04e5f1b9a9
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><div><div class=3D"gmail_default" style=3D"font-famil=
y:arial,helvetica,sans-serif">Hi everyone, <br></div><div class=3D"gmail_de=
fault" style=3D"font-family:arial,helvetica,sans-serif">=C2=A0 I have solve=
d a configuration problem due to myself in hadoop cluster mode.<br>


<br></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica=
,sans-serif">I have configuration as below: <br></div><br>=C2=A0 &lt;proper=
ty&gt;<br>=C2=A0=C2=A0=C2=A0 &lt;name&gt;<a href=3D"http://fs.default.name"=
 target=3D"_blank">fs.default.name</a>&lt;/name&gt;<br>


=C2=A0=C2=A0=C2=A0 &lt;value&gt;hdfs://master:54310&lt;/value&gt;<br>=C2=A0=
 &lt;/property&gt;<br><br>a<div class=3D"gmail_default" style=3D"font-famil=
y:arial,helvetica,sans-serif;display:inline">=E2=80=8Bnd the hosts file:=E2=
=80=8B</div><br><br>/etc/hosts:<br>

127.0.0.1=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 localhost<br>
<div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-seri=
f;display:inline">=E2=80=8B=E2=80=8B</div><div class=3D"gmail_default" styl=
e=3D"font-family:arial,helvetica,sans-serif;display:inline">=E2=80=8B=E2=80=
=8B</div>192.168.6.10=C2=A0=C2=A0=C2=A0 localhost <div class=3D"gmail_defau=
lt" style=3D"font-family:arial,helvetica,sans-serif;display:inline">


=E2=80=8B###=E2=80=8B</div><br>192.168.6.10=C2=A0=C2=A0=C2=A0 tulip master<=
br>192.168.6.5=C2=A0=C2=A0=C2=A0=C2=A0 violet slave<br><br>=E2=80=8Ba<div c=
lass=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;disp=
lay:inline">=E2=80=8Bnd when i was trying to start-dfs.sh, namenode failed =
to start.=E2=80=8B</div>


<br><br></div><div class=3D"gmail_default" style=3D"font-family:arial,helve=
tica,sans-serif;display:inline">=E2=80=8Bnamenode log hinted that:<br>13/09=
/09 17:09:02 INFO namenode.NameNode: Namenode up at: localhost/<a href=3D"h=
ttp://192.168.6.10:54310" target=3D"_blank">192.168.6.10:54310</a><br>


...<br>13/09/09 17:09:10 INFO ipc.Client: Retrying connect to server: local=
host/<a href=3D"http://127.0.0.1:54310" target=3D"_blank">127.0.0.1:54310</=
a>. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithF&gt;=
<br>

13/09/09 17:09:11 INFO ipc.Client: Retrying connect to server: localhost/<a=
 href=3D"http://127.0.0.1:54310" target=3D"_blank">127.0.0.1:54310</a>. Alr=
eady tried 1 time(s); retry policy is RetryUpToMaximumCountWithF&gt;<br>
13/09/09 17:09:12 INFO ipc.Client: Retrying connect to server: localhost/<a=
 href=3D"http://127.0.0.1:54310" target=3D"_blank">127.0.0.1:54310</a>. Alr=
eady tried 2 time(s); retry policy is RetryUpToMaximumCountWithF&gt;<br>13/=
09/09 17:09:13 INFO ipc.Client: Retrying connect to server: localhost/<a hr=
ef=3D"http://127.0.0.1:54310" target=3D"_blank">127.0.0.1:54310</a>. Alread=
y tried 3 time(s); retry policy is RetryUpToMaximumCountWithF&gt;<br>


13/09/09 17:09:14 INFO ipc.Client: Retrying connect to server: localhost/<a=
 href=3D"http://127.0.0.1:54310" target=3D"_blank">127.0.0.1:54310</a>. Alr=
eady tried 4 time(s); retry policy is RetryUpToMaximumCountWithF&gt;<br>13/=
09/09 17:09:15 INFO ipc.Client: Retrying connect to server: localhost/<a hr=
ef=3D"http://127.0.0.1:54310" target=3D"_blank">127.0.0.1:54310</a>. Alread=
y tried 5 time(s); retry policy is RetryUpToMaximumCountWithF&gt;<br>


13/09/09 17:09:16 INFO ipc.Client: Retrying connect to server: localhost/<a=
 href=3D"http://127.0.0.1:54310" target=3D"_blank">127.0.0.1:54310</a>. Alr=
eady tried 6 time(s); retry policy is RetryUpToMaximumCountWithF&gt;<br>13/=
09/09 17:09:17 INFO ipc.Client: Retrying connect to server: localhost/<a hr=
ef=3D"http://127.0.0.1:54310" target=3D"_blank">127.0.0.1:54310</a>. Alread=
y tried 7 time(s); retry policy is RetryUpToMaximumCountWithF&gt;<br>


13/09/09 17:09:18 INFO ipc.Client: Retrying connect to server: localhost/<a=
 href=3D"http://127.0.0.1:54310" target=3D"_blank">127.0.0.1:54310</a>. Alr=
eady tried 8 time(s); retry policy is RetryUpToMaximumCountWithF&gt;<br>13/=
09/09 17:09:19 INFO ipc.Client: Retrying connect to server: localhost/<a hr=
ef=3D"http://127.0.0.1:54310" target=3D"_blank">127.0.0.1:54310</a>. Alread=
y tried 9 time(s); retry policy is RetryUpToMaximumCountWithF&gt;<br>


...<br><br></div><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;display:inline">Now I know deleting the line &quot;=E2=
=80=8B192.168.6.10=C2=A0=C2=A0=C2=A0 localhost=C2=A0 ###</div><div class=3D=
"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;display:inl=
ine">


=E2=80=8B</div>=E2=80=8B=E2=80=8B&quot;<div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;display:inline">=E2=80=8B would =
fix this.<br></div><div class=3D"gmail_default" style=3D"font-family:arial,=
helvetica,sans-serif;display:inline">

But I still don&#39;t know=E2=80=8B</div>
=C2=A0<div class=3D"gmail_default" style=3D"font-family:arial,helvetica,san=
s-serif;display:inline">=E2=80=8Bwhy hadoop would resolve &quot;master&quot=
; to &quot;localhost/<a href=3D"http://127.0.0.1">127.0.0.1</a>.&quot;=E2=
=80=8B</div><br><div class=3D"gmail_default" style=3D"font-family:arial,hel=
vetica,sans-serif">

<br>=E2=80=8BSeems <a href=3D"http://blog.devving.com/why-does-hbase-care-a=
bout-etchosts/" target=3D"_blank">http://blog.devving.com/why-does-hbase-ca=
re-about-etchosts/</a> explains this, <br></div><div class=3D"gmail_default=
" style=3D"font-family:arial,helvetica,sans-serif">
I&#39;m not quite sure.=E2=80=8B<br></div></div>I=E2=80=8Bs there any<div c=
lass=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;disp=
lay:inline">=C2=A0other=E2=80=8B</div> explanation to this?<br><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;display:=
inline">
<br>Thanks.=E2=80=8B</div><br><br><div><div>-- <br><div dir=3D"ltr">Cipher =
Chen<br></div>
</div></div></div>

--089e0149396428de0e04e5f1b9a9--