Looking at 0.15 code - map.input.file would not work at all (it's only set once per map task and only when 'if (instantiatedSplit instanceof FileSplit)')
one of the things that stands out trying to do more complicated stuff in map reduce is that the application ends up needing a global session object (per map or reduce task). I wish there was a clean hook to set one up - but essentially u would have to do ur own inputformat (well u have to extend multifileinputformat anyway) and instantiate a singleton and store the current file name in it. the map class can get the current file name from the same singleton per map invocation .. -----Original Message----- From: Jason Venner [mailto:[EMAIL PROTECTED] Sent: Thursday, May 29, 2008 9:56 PM To: core-user@hadoop.apache.org Subject: Question about MultiFileInputFormat and conf.get( "map.input.file"), and the stability of the result We have a lot of jobs that check the map.input.file in the configure method, and cause the mapper to act differently based on the file name. We haven't started using the MultiFileInputFormat, but are wondering if anyone has a plan for our the map.input.file will appear in the config method, and or if this this becomes something you have to check in the mapper, rather than the configure method. Thanks again
