the masters file only contains the secondary namenodes. when you start-dfs.sh or start-all, the namenode, which is the master, is started on the local machine, and secondary namenodes are started on each host listed in conf/masters
This now confusing pattern is probably the result of some historical requirement that we are unaware of. Here are the relevant lines from bin/start-dfs.sh # start dfs daemons # start namenode after datanodes, to minimize time namenode is up w/o data # note: datanodes will log connection errors until namenode starts "$bin"/hadoop-daemon.sh --config $HADOOP_CONF_DIR start namenode $nameStartOpt "$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR start datanode $dataStartOpt "$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR --hosts masters start secondarynamenode On Thu, May 14, 2009 at 11:36 PM, Ninad Raut <hbase.user.ni...@gmail.com>wrote: > But if we have two master in the master file we have master and secondary > node, *both *processes getting started on the two servers listed. Cant we > have master and secondary node started seperately on two machines?? > > On Fri, May 15, 2009 at 9:39 AM, jason hadoop <jason.had...@gmail.com > >wrote: > > > I agree with billy. conf/masters is misleading as the place for secondary > > namenodes. > > > > On Thu, May 14, 2009 at 8:38 PM, Billy Pearson > > <sa...@pearsonwholesale.com>wrote: > > > > > I thank the secondary namenode is set in the masters file in the conf > > > folder > > > misleading > > > > > > Billy > > > > > > > > > > > > "Rakhi Khatwani" <rakhi.khatw...@gmail.com> wrote in message > > > news:384813770905140603g4d552834gcef2db3028a00...@mail.gmail.com... > > > > > > Hi, > > >> I wanna set up a cluster of 5 nodes in such a way that > > >> node1 - master > > >> node2 - secondary namenode > > >> node3 - slave > > >> node4 - slave > > >> node5 - slave > > >> > > >> > > >> How do we go about that? > > >> there is no property in hadoop-env where i can set the ip-address for > > >> secondary name node. > > >> > > >> if i set node-1 and node-2 in masters, and when we start dfs, in both > > the > > >> m/cs, the namenode n secondary namenode processes r present. but i > think > > >> only node1 is active. > > >> n my namenode fail over operation fails. > > >> > > >> ny suggesstions? > > >> > > >> Regards, > > >> Rakhi > > >> > > >> > > > > > > > > > > > > -- > > Alpha Chapters of my book on Hadoop are available > > http://www.apress.com/book/view/9781430219422 > > www.prohadoopbook.com a community for Hadoop Professionals > > > -- Alpha Chapters of my book on Hadoop are available http://www.apress.com/book/view/9781430219422 www.prohadoopbook.com a community for Hadoop Professionals
