Thanks for paying attention to my tentative idea! What I thought isn't how to store the meradata, but the final (or last) way to recover valuable data in the cluster when something worst (which destroy the metadata in all multiple NameNode) happen. i.e. terrorist attack or natural disasters destroy half of cluster nodes within all NameNode, we can recover as much data as possible by this mechanism, and hava big chance to recover entire data of cluster because fo original replication.
Any suggestion is appreciate! 2008/9/10 Pete Wyckoff <[EMAIL PROTECTED]> > +1 - > > from the perspective of the data nodes, dfs is just a block-level store and > is thus much more robust and scalable. > > > > On 9/9/08 9:14 AM, "Owen O'Malley" <[EMAIL PROTECTED]> wrote: > > > This isn't a very stable direction. You really don't want multiple > distinct > > methods for storing the metadata, because discrepancies are very bad. > High > > Availability (HA) is a very important medium term goal for HDFS, but it > will > > likely be done using multiple NameNodes and ZooKeeper. > > > > -- Owen > > -- Sorry for my english!! 明
