The secondary namenode is not for higher availability, please see the Hadoop FAQ for the reason (the name is very misleading). So even if the SPOF is solved in 0.20 for HBase, the Namenode still requires extra care.
J-D On Thu, Apr 16, 2009 at 8:13 PM, Jae Joo <[email protected]> wrote: > Is "Secondary Name Node" in hadoop can be used in hbase or is it what we can > expect in 0.20? > > Jae > > On Thu, Apr 16, 2009 at 7:38 PM, Jae Joo <[email protected]> wrote: > >> I have read and foind that the master node is SPOF and 0.20 will have >> failover system for master node. Any update or any solution to avio >> SPOF? >> Jae >> >> On 4/16/09, Billy Pearson <[email protected]> wrote: >> > hbase and hadoop both have a single node (namenode & master) that tell >> the >> > clients where stuff is that's all they do is keep up with >> > where stuff is they do not handle the getting of the data the client api >> > will go to the node with the data they tell it to find the data and get >> the >> > data. >> > >> > as for adding new nodes to hadoop to balance the cluster you can use >> > bin/start-balancer.sh -threshold 5 >> > Where 5 is the % you want the nodes to be with in each other in terms of >> > used % >> > >> > Billy >> > >> > >> > "Jae Joo" <[email protected]> wrote in >> > message news:[email protected]. >> .. >> >> Hi, >> >> >> >> We are doing some feasibility study of HBase and have questions. >> >> 1. Once we have build tables on certain number node and decide to add >> more >> >> nodes, how it is working? I know that it is not hbase, but hadoop >> >> questions. >> >> Will it automatically redistribute the files or start utilizing the new >> >> node >> >> for new inserted records? >> >> >> >> 2. Is there any way to have multile master nodes? Should all traffis (or >> >> requests) be going to SIngle Master node to access the data from hbase? >> >> >> >> >> >> Thanks, >> >> >> >> Jae >> >> >> > >> > >> > >> >> -- >> Sent from my mobile device >> >
