Hello all. I've just tested MapReduce in C++ against the Java version.
I did run WordCount included in 0.14.1 release version on a 1 node Hadoop cluster (Pentium D with 2GB of RAM). There were 2 input files (one 4.5MB file + one 36MB file). I also did take Combiner out of Java version WordCount MapReduce, as there was no Combiner used for C++ version. The result is.... as many of you have guessed, Java version won the race big time. Java version was about 4 times quicker. Here is more detailed result. Java Version C++ Version Ratio (Java : C++) Total Time Taken 89 364 1 : 4 Longest Time Taken for Map 41 83 1 : 2 Longest Time Taken for Reduce 58 264 1 : 4.5 Any guess or idea on how to improve the performance of C++ MapReduce? Taeho -- Taeho Kang [tkang.blogspot.com]
