mapreduce
Passing an argument to map.js in a CouchApp view
I have a CouchApp that functions like a social network. I have a like button which, when clicked by a user, creates and saves a CouchDB JSON document with the fields post_id (the ID of the post that w[详细]
2023-03-22 02:52 分类：问答Cannot run Java class files with hadoop streaming
Whenever I am trying to use Java class files as my mapper and/or reducer I am getting the following error:[详细]
2023-03-22 02:36 分类：问答Add Entire Files Text as Map Key in Hadoop
I\'m looking for a way to loa开发者_StackOverflow中文版d an entire file text into my map.Not a single line at a time like TextInputFormat does.[详细]
2023-03-21 19:42 分类：问答Querying and grouping in mongoDb?
Part 1: I have (student) collection: { sname : \"\", studentId: \"123\" age: \"\", gpa: \"\", } im trying to get only two keys from it :[详细]
2023-03-21 02:49 分类：问答Recursive calculations using Mapreduce
I am working on map reduce program and was thinking about designing computations of the form where a1, b1 are the values associated with a key[详细]
2023-03-21 02:48 分类：问答Help with map reduce in MongoDB
I\'m struggling to get a firm grasp of how map reduce works and when to use it. I\'m getting some random results that just isn\'t making sense, but maybe my understanding of mapreduce in wrong?[详细]
2023-03-20 23:56 分类：问答apache pig command
just wondering what 开发者_JS百科does the following command means? so hard to google topics related to pig:[详细]
2023-03-20 22:12 分类：问答hadoop eclipse plugin not deploying code to hadoop cluster
Is there any place where i can find how to configure hadoop eclipse plugin which comes with hadoop down开发者_高级运维load.?[详细]
2023-03-20 18:10 分类：问答Writing only the Value on Mapper Job
I am currently working on a MapReduce Job which I am only using the mapper without the reducer. I do not need to write the key out because I only need the values which are stored in an array and want[详细]
2023-03-20 12:51 分类：问答In practice, how many machines do you need in order for Hadoop / MapReduce / Mahout to speed up very parallelizable computations?
I need to do some heavy machine learning computations. I have a small number of machines idle on a LAN. How many machines would I need in order for distrubuting my computations using hadoop / mapreduc[详细]
2023-03-20 06:14 分类：问答
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