On Fri, Aug 24, 2012 at 3:33 PM, wei xu <sqlxwei...@gmail.com> wrote: > I am doing some research on the data placement, but I am not quite familiar > with the Hadoop, is there any one who can tell me when a new file be added > into the HDFS, which function will be called by namenode to make a decision > on the allocation ( I mean, if there has a list of datanodes and the file > might be larger than 64MB, that is, several blocks may be included. What's > the function that decide the placement of those blocks to those datanode?)
You'll want to read BlockPlacementPolicy and its inheritors. -andy
