ESGLinux 2012-12-20, 16:30
Harsh J 2012-12-20, 17:12
-Re: Question about HA and Federation
ESGLinux 2012-12-20, 17:39
First thank you very much for your answer,
following your example:
1 Active NameNode + 1 Passive NameNode (it does the work of the old
Secondary NameNode) for NS1 NameSpace (these are 2 diferent machines)
1 NameNode for NS2
1 NameNode for NS3
but what about the Secondary Name Nodes for NS2 and NS3? or I don´t need
it? perhaps I´m mixing concepts....
2012/12/20 Harsh J <[EMAIL PROTECTED]>
> Hi ESGLinux,
> Federation and HA are two distinct features that share some common
> properties but nothing more. You can turn on HA for any selected
> Namespace but it is not necessarily needed to be that all Namespaces
> have HA.
> Perhaps an example will clear it up for you.
> I have a local instance that is configured to run several namespaces:
> ns1, ns2, and ns3 (Federated Namespaces).
> The namespace ns1 hosts my HBase tables and is critical to me, so I
> have also turned on HA for this namespace alone.
> The other two namespaces ns2 and ns3 are used only for regular query
> jobs so its not yet very important for me to have HA on it. So I run
> them without HA.
> Thus I have 4 NameNode processes in my cluster in all, given my design
> above: (2 NNs under ns1, in HA mode) + (1 NN of ns2) + (1 NN of ns3).
> On Thu, Dec 20, 2012 at 10:00 PM, ESGLinux <[EMAIL PROTECTED]> wrote:
> > Hi All,
> > I´m going to test a hadoop cluster and I have a doubt about HA and
> > Federation.
> > With federation I Have a NameNode per namespace and with HA I have an
> > NameNode and a standby NameNode.
> > so, as I have sevaral namespaces, do I need an Active NameNode and a
> > nameNode per namespace?
> > I have read this documentation but It´s not clear for me :-(
> > Thanks in advance
> > ESGLinux
> Harsh J
Harsh J 2012-12-20, 17:48
ESGLinux 2012-12-20, 17:55
Harsh J 2012-12-20, 17:57
ESGLinux 2012-12-20, 18:03
Harsh J 2012-12-20, 18:26