Thanks but I found that BlockPlacementPolicy only appear after 0.21.0? Is there any similar class or function appeared in 0.20.
On Fri, Aug 24, 2012 at 6:03 PM, Andy Isaacson <a...@cloudera.com> wrote: > 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 >
