hadoop-common-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Chris Nauroth <cnaur...@hortonworks.com>
Subject Re: HA Hadoop journal nodes configuration
Date Thu, 08 Jan 2015 23:02:20 GMT
Another source of information is the Apache documentation on high
availability with QJM:


That page's section on Hardware resources also has a direct answer to your
last question about whether or not a SecondaryNameNode is required.

Note that, in an HA cluster, the Standby NameNode also performs checkpoints
of the namespace state, and thus it is not necessary to run a Secondary
NameNode, CheckpointNode, or BackupNode in an HA cluster. In fact, to do so
would be an error.

Chris Nauroth

On Wed, Jan 7, 2015 at 9:05 PM, Ted Yu <yuzhihong@gmail.com> wrote:

> Please see
> http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.1-latest/bk_system-admin-guide/content/ch_hadoop-ha-3-2.html
> Look for 'Standby NameNode'
> Cheers
> On Wed, Jan 7, 2015 at 8:57 PM, Shashidhar Rao <raoshashidhar123@gmail.com
> > wrote:
>> Hi,
>> Thanks it helped me a lot. But I am not seeing any secondary namenode so
>> my question is is Secondary Namenode required in HA Hadoop cluster
>> Thanks
>> Sd
>> On Thu, Jan 8, 2015 at 9:38 AM, Ted Yu <yuzhihong@gmail.com> wrote:
>>> Please take a look at
>>> http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.1-latest/bk_system-admin-guide/content/ch_hadoop-ha-3-1.html
>>> Cheers
>>> On Wed, Jan 7, 2015 at 8:00 PM, Shashidhar Rao <
>>> raoshashidhar123@gmail.com> wrote:
>>>> Hi,
>>>> I want to setup Hadoop HA with 2 NameNodes and journal nodes. But I am
>>>> not sure what should be the configuration of journal nodes
>>>> 1. How many journal nodes I need
>>>> 2. What should be the machine configuration like RAM, disk size etc
>>>> This is for a fairly small cluster dealing with 20 Terabytes of data.
>>>> Thanks
>>>> Sd

NOTICE: This message is intended for the use of the individual or entity to 
which it is addressed and may contain information that is confidential, 
privileged and exempt from disclosure under applicable law. If the reader 
of this message is not the intended recipient, you are hereby notified that 
any printing, copying, dissemination, distribution, disclosure or 
forwarding of this communication is strictly prohibited. If you have 
received this communication in error, please contact the sender immediately 
and delete it from your system. Thank You.

View raw message