For 0.20 version, you should go to ReplicationTargetChooser which is called from FSNamesystem.
Le Hieu Hanh On Sat, Aug 25, 2012 at 9:00 AM, Vivi Lang <sqlxwei...@gmail.com> wrote: > 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 > > >
