There is only one file per-map. Actually two, an output file and an index file to quickly get the offset/length for a given reducer.
The index file is also cached in memory for performance. Arun On Sep 25, 2011, at 10:00 AM, He Chen wrote: > Hi everyone > > According to my understanding of Hadoop, it save MapReduce job's > intermediate results into files in the mapper's hard drive. Each key will > occupy a file. I am curious what will happen if mapper's hard drive does not > have enough inodes to save the generated keys. Because every file needs a > inode. > > Best wishes! > > Chen
