Praveen, It has re-factored in trunk. You can find this in BlockPlacementPolicy ( interface) implementation class. i.e BlockPlacementPolicyDefault.
Regards, Uma ________________________________________ From: Praveen Sripati [praveensrip...@gmail.com] Sent: Wednesday, December 07, 2011 10:28 PM To: common-dev@hadoop.apache.org Subject: Re: Re: how to select the position of a block Not sure why, but I was able to find ReplicationTargetChooser.java only in branch-1.0 and not in trunk, 21, 22 and 23. Regards, Praveen 2011/12/7 郭冲 <guochongh...@126.com> > > > isGoodTarget() in ReplicationTargetChooser.java judge if a node is a > good node, it will consider the disk space , load , and the rack which it > located has too much nodes or not .Thanks! > > At 2011-12-07 13:01:26,"Harsh J" <ha...@cloudera.com> wrote: > >Moving discussion to hdfs-dev. > > > >DataNodes report disk usage (space) and current transfer thread counts > (load) periodically to the NameNode. NameNode uses this information to make > a decision while building the pipeline DNs for your client request. I > believe the class is called something like ReplicationTargetChooser (off > the top of my mind), and you can take a look at the logic involved there in > selecting any form of node (isGoodTarget or summat). Then work your way > downwards to see how the information flows. > > > >On 07-Dec-2011, at 8:36 AM, 郭冲 wrote: > > > >> Hadoop:The Definitive Guide said that when the client is out of the > cluster, hadoop will select the storage position of a block randomly,but it > will not select the datanode which is too busy or too full. > >> > >> so i want to kown that how hadoop judge or measure a datanode is full > or not? > > >
