Oh, my mistake on the last question. I was still confused about the concept of Hbase replication service. Scratch my last question.
Ed 2011/10/13 edward choi <[email protected]> > > 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 >> > >
