Cos, Am planning to implement this idea in bigger cluster but first i want to get confidence in small cluster. I do read about terracotta and inspired by this idea.
-gokul On Fri, Sep 23, 2011 at 11:57 PM, Konstantin Boudnik <c...@apache.org> wrote: > Gokul, > > Terracotta is a fascinating framework which might be a bit of an overshot for > a > small setup as well as adding another level of complexity in the form > Terracotta framework. > > Quite interesting approach for NN's HA is Jini (aka ASF River) along with > JavaSpaces for the distributed storage of the meta-data. Using Jini also gives > you for free such benefits as auto-discovering making hot-swap of NN a > non-issue. > > I've been musing over this idea for some time and am trying to find some time > to actually experiment with it. > > Cos > > On Fri, Sep 23, 2011 at 11:36PM, Gokul Prasad wrote: >> Hi, >> Am trying to bring high availability in namenode(in hadoop cluster) for >> small setup. >> So the idea is to keep one extra namenode and use terracotta to replicate >> the log(in memory details-jvm) from primary datacode to standby namenode, >> if primary goes down secondary can take the primary role. >> Now am bit confused how to start second namenode while the primary name >> node up and running(with datanode connected) with keep relying the info >> from primary thro terracotta. Is there a way to achieve this without >> restarting namenode or datanode, any patch? >> Please help and suggest me. >> Regards, >> Gokul >
