mapreduce_开发者

RavenDB: How to use Multi Maps / Reduce indexes

I have quite simple model: public class PhraseMeta: { public 开发者_运维百科int Id { get; set; }[详细]

2023-04-06 03:24 分类：问答

How to tell MapReduce how many mappers to use at the same time?

I am w开发者_C百科riting an indexing app for MapReduce. I was able to split inputs with NLineInputFormat, and now I\'ve got few hundred mappers in my app. However, only 2/mashine of those are active a[详细]

2023-04-06 01:34 分类：问答

How to set the number of map tasks in hadoop 0.20?

I\'m trying to set the number of map tasks to run in hadoop 0.20 environment. I am using the old api. Here are the options I\'ve tried so far:[详细]

2023-04-05 19:24 分类：问答

pymongo User Assertion: 13606:'out' has to be a string or an object

I can\'t figure out what I\'m doing wrong here. I\'m using pymongo and have the following map/reduce code (all attributes of the document are directly accessible - i.e. no embedded parts relevant here[详细]

2023-04-05 17:36 分类：问答

mongodb map reduce: "first/lowest" value?

I have documents like this: { \"_id\" : \"someid\", \"name\" : \"somename\", \"action\" : \"do something\",[详细]

2023-04-05 14:53 分类：问答

How to create SIGN UP and LOG IN with Jquery and CouchDb?

How to set up couchDb to perform SignUp and LogIn? Creating special database just for that, or giving evry document username and password. The goal is to retrieve custom document ba开发者_如何学编程se[详细]

2023-04-05 14:11 分类：问答

How to tell MapReduce how many mappers to use?

I am trying to speed optimize MapReduce job. Is there any way I can tell hadoop to use a particular number of mapper/reducer processes? Or, at least, minimal number of mapper processes?[详细]

2023-04-05 01:04 分类：问答

MapReduce - What is the benefit in the word count example

I am trying to understand what is the benefit of MapReduce, I have just read some introductions on it for the first time.[详细]

2023-04-05 00:49 分类：问答

Refer to base types that have a raw type constraint

I\'ve been playing around with Scala, trying to get SMR to compile in Scala IDE with 2.9.1.SMR seems to have gone untouched since 2008-ish, and there are a lot of unresolved compile errors.The one tha[详细]

2023-04-04 22:08 分类：问答

What is the best way of reading/writing binary input/output files with MapReduce?

In all samples I\'ve seen so far, mapreduce apps take text files as input and write text as output. I\'d like my app to 开发者_开发知识库read objects from the binary file and write objects back to ou[详细]

2023-04-04 21:02 分类：问答