Yep, hadoop-2 is alpha but is progressing nicely... However, if you have access to some 'enterprise HA' utilities (VMWare or Linux HA) you can get *very decent* production-grade high-availability in hadoop-1.x too (both NameNode for HDFS and JobTracker for MapReduce).
Arun On Aug 10, 2012, at 12:12 PM, anil gupta wrote: > Hi Aji, > > Adding onto whatever Mohammad Tariq said, If you use Hadoop 2.0.0-Alpha then > Namenode is not a single point of failure.However, Hadoop 2.0.0 is not of > production quality yet(its in Alpha). > Namenode use to be a Single Point of Failure in releases prior to Hadoop > 2.0.0. > > HTH, > Anil Gupta > > On Fri, Aug 10, 2012 at 11:55 AM, Ted Dunning <[email protected]> wrote: > Hadoop's file system was (mostly) copied from the concepts of Google's old > file system. > > The original paper is probably the best way to learn about that. > > http://research.google.com/archive/gfs.html > > > > On Fri, Aug 10, 2012 at 11:38 AM, Aji Janis <[email protected]> wrote: > I am very new to Hadoop. I am considering setting up a Hadoop cluster > consisting of 5 nodes where each node has 3 internal hard drives. I > understand HDFS has a configurable redundancy feature but what happens if an > entire drive crashes (physically) for whatever reason? How does Hadoop > recover, if it can, from this situation? What else should I know before > setting up my cluster this way? Thanks in advance. > > > > > > > -- > Thanks & Regards, > Anil Gupta -- Arun C. Murthy Hortonworks Inc. http://hortonworks.com/
