>From here: http://wiki.apache.org/hadoop/TaskExecutionEnvironment
The following properties are localized for each task's JobConf: *Name* *Type* *Description* mapred.job.id String The job id mapred.task.id String The task id mapred.task.is.map boolean Is this a map task mapred.task.partition int The id of the task within the job map.input.file String The filename that the map is reading from map.input.start long The offset of the start of the map input split map.input.length long The number of bytes in the map input split On 26/03/2008, Brensch <[EMAIL PROTECTED]> wrote: > > > Hello everybody, > > I've been playing with Hadoop for a few days, and I'm only starting to > explore it's beauty. > > In an attempt to learn on the Grep Example, I ended up wondering whether > you > can actually extract from within a map, on which file you are currently > running. > e.g. Suppose I want to grep through a set of files, and instead of having > only a global response, I need an output per file as well. > > > ./bin/hadoop jar hadoop-0.16.1-examples.jar grep input output "au[a-c]" > > > input/file1.txt 3 aua > > input/file1.txt 2 aub > > input/file1.txt 1 auc > > > input/file2.txt 1 aua > > input/file2.txt 2 aub > > input/file2.txt 3 auc > > > 4 aua > > 4 aub > > 4 auc > > > now this could be really easy to do (just hit the right variable in the > JobConf?) or it could be absolutely impossible, since its hadoop's innate > goal to extract from file-related stuff - I'd really appreciate a hint or > a > link to read about this. > > regards, > Brensch > > -- > View this message in context: > http://www.nabble.com/Howto-%3A-Monitor-File-Job-allocation-tp16297900p16297900.html > Sent from the Hadoop core-user mailing list archive at Nabble.com. > > -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.
