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Hadoop >> mail # user >> Re: so the master just died... now what?

Shahab Yunus 2013-09-03, 21:01
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Re: so the master just died... now what?
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,
On Wed, Sep 4, 2013 at 2:31 AM, Shahab Yunus <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]>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