You should use the DistributedCache: < http://www.cloudera.com/blog/2008/11/14/sending-files-to-remote-task-nodes-with-hadoop-mapreduce/ >
and < http://hadoop.apache.org/core/docs/current/mapred_tutorial.html#DistributedCache > Hope this helps! Alex On Tue, Nov 25, 2008 at 11:09 AM, tim robertson <[EMAIL PROTECTED]>wrote: > Hi all, > > If I want to have an in memory "lookup" Hashmap that is available in > my Map class, where is the best place to initialise this please? > > I have a shapefile with polygons, and I wish to create the polygon > objects in memory on each node's JVM and have the map able to pull > back the objects by id from some HashMap<Integer, Geometry>. > > Is perhaps the best way to just have a static initialiser that is > synchronised so that it only gets run once and called during the > Map.configure() ? This feels a little dirty. > > Thanks for advice on this, > > Tim >
