imcaptor 2009-07-30, 08:27
Steve Loughran 2009-07-30, 12:27
David B. Ritch 2009-07-30, 12:39
As David mentions, you can find more information on one approach to HA for
the NN at http://www.cloudera.com/blog/2009/07/22/hadoop-ha-configuration/.
On Thu, Jul 30, 2009 at 5:39 AM, David B. Ritch <[EMAIL PROTECTED]>wrote:
> Check out the Cloudera blog (http://www.cloudera.com). They posted
> instructions for one approach.
> On 7/30/2009 8:27 AM, Steve Loughran wrote:
> > imcaptor wrote:
> >> Dear All:
> >> The NameNode is the Single Point of hadoop,
> > It's *one* SPOF - unless your datacentre has multiple gigabit
> > backbones on separate switches and more than electricity supply from
> > different power supply grids, you have others out there. Then there's
> > the issue of which fault lines your facility is close to, whether it
> > is built on the mud flows of previous eruptions (Enumclaw, WA spring
> > to mind), etc.
> >> I want to know how to HA the NameNode.
> > This is a major engineering project that has been discussed on the
> > lists. If you want to get involved in it, and have the skills -and the
> > testing facilities- you would be welcome. Testing HA/failover is
> > tricky because of the many ways things can fail.
> > Otherwise, focus on making sure your namenode data is streamed off
> > onto different disks, you have a secondary NN, and you have a good
> > recovery process that includes the failure of the NN hardware