On Tue, Jan 17, 2012 at 10:08 AM, Otis Gospodnetic < otis_gospodne...@yahoo.com> wrote:
> Hello, > > How much memory/JVM heap does NameNode use for each block? > > I've tried locating this in the FAQ and on search-hadoop.com, but > couldn't find a ton of concrete numbers, just these two: > > http://search-hadoop.com/m/RmxWMVyVvK1 - 150 bytes/block? > http://search-hadoop.com/m/O886P1VyVvK1 - 1 GB heap for every object? > > Thanks, > Otis > Some real world statistics. From NN web Interface. replication factor=2 Cluster Summary 22,061,605 files and directories, 22,151,870 blocks = 44,213,475 total. Heap Size is 10.85 GB / 16.58 GB (65%) compressedOOps is enabled.
