mapreduce_开发者

MongoDB incremental mapReduce, select only new documents, added after last mapReduce

Let\'s say I have a collection with documents that looks like this (just simplified example, but it should show the scheme):[详细]

2023-04-13 08:12 分类：问答

MongoDB Map/Reduce incrementally with adaptative query

I have an issue with data I want to aggregate incrementally. I have devices (a lot, stored in the device collection) that emits measures (NOT regularly) that are stored in the db in the record collec[详细]

2023-04-13 05:30 分类：问答

Getting error "ImportError: Could not find 'input_readers' on path 'map reduce'" trying to start mapReduce job

I\'m getting this error... \"ImportError: Could not find \'input_readers\' on path \'map reduce\'\" when trying to Run my map reduce job via the http://localhost:8080/mapreduce launcher page.[详细]

2023-04-13 04:22 分类：问答

What are some good measurement comparisons to be done using Ganglia metrics for Amazon Elastic Mapreduce programs?

I have seen Ganglia monitoring being implemented and analyzed on grid computing projects, but haven\'t read about any procedure for Amazon Elastic Mapreduce programs. Ganglia has a lot of metrics, but[详细]

2023-04-13 02:58 分类：问答

How do I design a couchdb view for following case ?

I am migrating an application from mySQL to couchDB. (Okay, Please dont pass judgements on this). There is a function with signature[详细]

2023-04-12 15:56 分类：问答

hadoop-streaming : writing output to different files

Here is the scenario Reducer1 / Mapper - - Reducer2 \\ ReducerN In reducer I want to write the data on different files, lets say the reducer looks like[详细]

2023-04-12 13:42 分类：问答

How do you specify the filename for the BlobstoreOutputWriter for a simple mapreduce job?

How or where do I specify the output_writer filename and content type for a GAE mapreduce job? This configuration below is working fine for me, but it creates a new blobstore entry with a new filename[详细]

2023-04-12 10:54 分类：问答

RavenDB complex MapReduce index missing output

This is a continuation of the project from this post. I have the following model: public class Product {[详细]

2023-04-12 08:41 分类：问答

Get a org.apache.hadoop.mapreduce.Job from a job already completed on the JobTracker

I\'m using org.apache.hadoop.mapreduce.Job to create/submit/run a MR Job (Cloudera3, 20.2), and after it completes, in a separate application, I\'m trying to get the Job to grab the counters to do som[详细]

2023-04-12 08:34 分类：问答

Chain Multiple Reduce in ChainReducer

I have are requirement to chain a map redu开发者_如何学Cce job like this using map reduce chaining. [Map --> Reduce --> Map --> Reduce -- > Map --> Map]. Looking at Javadocs of ChainReducer I get the[详细]

2023-04-12 01:50 分类：问答