18. Hadoop on Azureざっくり
• Apache Hadoop-based Service on Azure
• CTP
• 4~32Nodes
– 48時間で全ノードおよびHDFSがリセット
• Execute MapReduce by 2-way
– JAR & Console
• Connect with other services
– S3, Data Market ,Blob Storage ,Excel
24. JavaScriptでMapReduce
var map = function (key, value, context) {
var words = value.split(/[^a-zA-Z]/);
words.forEach( function (word) {
if (word !== "") {
context.write(word.toLowerCase(), 1);
}
});
};
var reduce = function (key, values, context) {
var sum = 0;
while (values.hasNext()) {
sum += parseInt(values.next());
}
context.write(key, sum);
};