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.
