Oops, the message came out garbled. I meant to say I assume the outlined changes won't prevent an earlier version of HDFS from upgrades to the federation version, right?
Thanks in advance, Cos On Tue, Apr 26, 2011 at 17:59, Konstantin Boudnik <c...@apache.org> wrote: > Sanjay, > > I assume the outlined changes won't an earlier version of HDFS from > upgrads to the federation version, right? > > Cos > > On Tue, Apr 26, 2011 at 17:26, Sanjay Radia <sra...@yahoo-inc.com> wrote: >> >> Changes to the code base >> - The fundamental code change is to extend the notion of block id to now >> include a block pool id. >> - The NN had little change, the protocols did change to include the block >> pool id. >> - The DN code did change. Each data structure is now indexed by the block >> pool id -- while this is a code change, it is architecturally very simple >> and low risk. >> - We also did a fair amount of cleanup of threads used to send block reports >> - while it was not strictly necessary to do the cleanup we took the extra >> effort to pay the technical debt. As Dhruba recently noted, adding support >> to send block reports to primary and secondary NN for HA will be now much >> easier to do. >
