init push for the code base

.gitignore

@@ -0,0 +1,92 @@
+# -*- mode: gitignore; -*-
+*~
+\#*\#
+### Emacs ###
+# -*- mode: gitignore; -*-
+*~
+\#*\#
+/.emacs.desktop
+/.emacs.desktop.lock
+*.elc
+auto-save-list
+tramp
+.\#*
+
+# Org-mode
+.org-id-locations
+*_archive
+
+# flymake-mode
+*_flymake.*
+
+# eshell files
+/eshell/history
+/eshell/lastdir
+
+# elpa packages
+/elpa/
+
+# reftex files
+*.rel
+
+# AUCTeX auto folder
+/auto/
+
+# cask packages
+.cask/
+dist/
+
+# Flycheck
+flycheck_*.el
+
+# server auth directory
+/server/
+
+# projectiles files
+.projectile
+
+# directory configuration
+.dir-locals.el
+
+# network security
+/network-security.data
+
+
+# Compiled source #
+###################
+*.com
+*.class
+*.dll
+*.exe
+*.o
+*.so
+
+# Packages #
+############
+# it's better to unpack these files and commit the raw source
+# git has its own built in compression methods
+*.7z
+*.dmg
+*.gz
+*.iso
+*.jar
+*.rar
+*.tar
+*.zip
+
+# Logs and databases #
+######################
+*.log
+*.sql
+*.sqlite
+
+# OS generated files #
+######################
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+

Ch00-CourseOverview/AVGExample.java

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+private IntWritable one = new IntWritable(1);
+private IntWritable output = new IntWritable()
+proctected void map(
+LongWritable key,Text value, Context context) {
+String[] fields = value.split("\t");
+output.set(Integer.parseInt(fields[1]));
+context.write(one, output);
+}
+IntWritable one = new IntWritable(1);
+DoubleWritable average = new DoubleWritable();
+protected void reduce(IntWritable key,Iterable<IntWritable> values,Context context) {
+int sum = 0 ; int count = 0;
+for(IntWritable value : values) {
+sum += value.get(); count++;
+}
+average.set(sum / (double) count);
+context.Write(key, average);
+}