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From: Mohammad Tariq <dontariq@gmail.com>
Date: Wed, 4 Sep 2013 02:48:10 +0530
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 <CAMVC6RPFb82TM4s8UWf+7gOcOR06QE61F1tPgmaeLiiSOmULVg@mail.gmail.com>
Subject: Re: so the master just died... now what?
To: "user@hadoop.apache.org" <user@hadoop.apache.org>
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Hello Tomasz,

Just to add,

Although it says *masters*, the */conf/masters* actually specifies the
machine where *SecondaryNameNode* will run. Master daemons run on the
machine where you execute the start scripts. If you need to change the
master machine, you must make appropriate changes in the *core-site.xml *and
*mapred-site.xml* files. Also, update the IP and hostname  in the *
/etc/hosts* file of your slaves.


Warm Regards,
Tariq
cloudfront.blogspot.com


On Wed, Sep 4, 2013 at 2:31 AM, Shahab Yunus <shahab.yunus@gmail.com> wrote:

>
> Keep in mind that there are 2 flavors of Hadoop: the older one without HA
> and the  new one with it. Anyway, have you seen the following?
>
> http://wiki.apache.org/hadoop/NameNodeFailover
> http://www.youtube.com/watch?v=Ln1GMkQvP9w
>
> http://docs.hortonworks.com/HDPDocuments/HDP1/HDP-1.3.0/bk_hdp1-system-admin-guide/content/sysadminguides_ha_chap2_5_5.html
>
> Regards,
> Shahab
>
>
> On Tue, Sep 3, 2013 at 4:54 PM, Tomasz Chmielewski <mangoo@wpkg.org>wrote:
>
>> Just starting with hadoop and hbase, and couldn't find specific answers
>> in official documentation (unless I've missed the obvious).
>>
>>
>> Assuming I have three hadoop servers: h1, h2 and h3, with h1 being a
>> master+slave - what is a recovery scenario if the master server, h1,
>> died and is beyond repair (burned with all disks and got flooded)?
>>
>> Do I just edit conf/masters file on any of the remaining slaves (say,
>> h2), make it a master, and start the NameNode and JobTracker there?
>>
>> Can anyone point me to relevant documentation?
>>
>>
>> --
>> Tomasz Chmielewski
>> http://wpkg.org
>>
>>
>

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<div dir=3D"ltr">Hello Tomasz,<div><br></div><div>Just to add,</div><div><b=
r></div><div>Although it says <b>masters</b>, the <b>/conf/masters</b> actu=
ally specifies the machine where <b>SecondaryNameNode</b> will run. Master =
daemons run on the machine where you execute the start scripts. If you need=
 to change the master machine, you must make appropriate changes in the <b>=
core-site.xml </b>and <b>mapred-site.xml</b> files. Also, update the IP and=
 hostname =A0in the <b>/etc/hosts</b> file of your slaves.</div>

<div><br></div><div><br></div></div><div class=3D"gmail_extra"><br clear=3D=
"all"><div><div dir=3D"ltr">Warm Regards,<div>Tariq</div><div><a href=3D"ht=
tp://cloudfront.blogspot.com" target=3D"_blank">cloudfront.blogspot.com</a>=
<br></div>

</div></div>
<br><br><div class=3D"gmail_quote">On Wed, Sep 4, 2013 at 2:31 AM, Shahab Y=
unus <span dir=3D"ltr">&lt;<a href=3D"mailto:shahab.yunus@gmail.com" target=
=3D"_blank">shahab.yunus@gmail.com</a>&gt;</span> wrote:<br><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex">

<div dir=3D"ltr"><div><br></div>Keep in mind that there are 2 flavors of Ha=
doop: the older one without HA and the =A0new one with it. Anyway, have you=
 seen the following?<div><br><div><a href=3D"http://wiki.apache.org/hadoop/=
NameNodeFailover" target=3D"_blank">http://wiki.apache.org/hadoop/NameNodeF=
ailover</a><br>


</div><div><a href=3D"http://www.youtube.com/watch?v=3DLn1GMkQvP9w" target=
=3D"_blank">http://www.youtube.com/watch?v=3DLn1GMkQvP9w</a><br></div><div>=
<a href=3D"http://docs.hortonworks.com/HDPDocuments/HDP1/HDP-1.3.0/bk_hdp1-=
system-admin-guide/content/sysadminguides_ha_chap2_5_5.html" target=3D"_bla=
nk">http://docs.hortonworks.com/HDPDocuments/HDP1/HDP-1.3.0/bk_hdp1-system-=
admin-guide/content/sysadminguides_ha_chap2_5_5.html</a><br>


</div><div><br></div><div>Regards,</div><div>Shahab</div></div></div><div c=
lass=3D"HOEnZb"><div class=3D"h5"><div class=3D"gmail_extra"><br><br><div c=
lass=3D"gmail_quote">On Tue, Sep 3, 2013 at 4:54 PM, Tomasz Chmielewski <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:mangoo@wpkg.org" target=3D"_blank">man=
goo@wpkg.org</a>&gt;</span> wrote:<br>


<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Just starting with hadoop and hbase, and cou=
ldn&#39;t find specific answers<br>
in official documentation (unless I&#39;ve missed the obvious).<br>
<br>
<br>
Assuming I have three hadoop servers: h1, h2 and h3, with h1 being a<br>
master+slave - what is a recovery scenario if the master server, h1,<br>
died and is beyond repair (burned with all disks and got flooded)?<br>
<br>
Do I just edit conf/masters file on any of the remaining slaves (say,<br>
h2), make it a master, and start the NameNode and JobTracker there?<br>
<br>
Can anyone point me to relevant documentation?<span><font color=3D"#888888"=
><br>
<br>
<br>
-- <br>
Tomasz Chmielewski<br>
<a href=3D"http://wpkg.org" target=3D"_blank">http://wpkg.org</a><br>
<br>
</font></span></blockquote></div><br></div>
</div></div></blockquote></div><br></div>

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