Thank you all for the reply. Good thing to know that Hbase automatically restores data when regionservers fail. That is, even when I don't use Hbase replication service right?
And sorry about posting to two lists at the same time. I thought since the question also relates to HDFS, I'd post to Hadoop list too. Regards, Ed 2011/10/12 Harsh J <[email protected]> > Edward, > > HBase replication is entirely different than HDFS replication - The > former being cross-instance replication of HBase-data-only while the > latter replicates within nodes available in its own instance, and > covers all data generally. > > Read more about it here: http://hbase.apache.org/replication.html and > decide for yourself if you'd like to use it. > > (P.s. Please do not cross post to multiple lists. This question fit > HBase's lists.) > > On Wed, Oct 12, 2011 at 3:04 PM, edward choi <[email protected]> wrote: > > Hi, > > > > I am using CDH3U0 Hadoop and Hbase. > > > > I know that HDFS automatically replicates data to multiple data nodes so > > that when a couple of data nodes fail, the user won't lose any data. > > I am currently using replication factor of 3. > > > > Now in Hbase, I know there is some experimental replication service, but > I > > am not using it. I thought that since HDFS already does replication, > Hbase > > wouldn't need additional replication. > > Am I right on this? > > > > So my question would be: > > Given that I am using HDFS replication and not using Hbase replication, > if a > > couple of regionservers fail, am I still able to access all the data I > have > > stored before? > > > > I would appreciate any help. > > Thanks. > > > > Ed > > > > > > -- > Harsh J >
