On Wed, Mar 22, 2006 at 03:13:40PM -0800, Doug Cutting wrote: > Yes, although each task runs in a separate JVM, not a thread. A slave > will run up to mapred.tasktracker.tasks.maximum map and/or reduce > tasks at a time.
That makes sense. > The actual number of map tasks is determined by the number of input > splits. Perhaps your input data is not big enough to result in more > than a few input splits? A SequenceFile-format input cannot be split > into chunks smaller than 2k bytes. It turns out that the expected number of jobs did run on each machine--they just finished quickly enough that I didn't see them in top. Thanks. -- Andrew McNabb http://www.mcnabbs.org/andrew/ PGP Fingerprint: 8A17 B57C 6879 1863 DE55 8012 AB4D 6098 8826 6868
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