This is a tricky problem. To add further confusion some variables are used in multiple components.
Mapred.local.dir is used by task and job tracker.hadoop.tmp.dir is the default for everything. On 1/20/10, Allen Wittenauer <[email protected]> wrote: > > > > On 1/19/10 7:54 PM, "Amareshwari Sri Ramadasu" <[email protected]> > wrote: > >> Hi Zhang, >> >> The following parameters are node specific. >> mapred.tasktracker.map.tasks.maximum >> mapred.tasktracker.reduce.tasks.maximum >> tasktracker.http.threads >> dfs.datanode.handler.count >> >> The rest of the parameters are Job-specific. > > ... Except for the ones that are namenode and jobtracker specific. > > :( > > Hadoop configuration sucks greatly, and the lack of real documentation on > what parameters exist (it seems like every month there is a "new" hidden > param) and what actually uses them (i.e., where is final actually taking > into account?) doesn't help. > > [ and no, *-default.xml and/or "read the source!" is not good enough.] > >
