mapreduce

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Is Hadoop going to give me more benefits in my case? [closed]

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references,or expertise, but this question will likely solicit debate, a[详细]

2023-03-25 16:16 分类：问答
How to make your mapper write on local file system in hadoop

I wish to write a file and create a directory in my local file system through m MapReduce code. Also if I create a directory in the working directory during the job execution, how can I mo开发者_如何转[详细]

2023-03-25 14:17 分类：问答
why Mutation does not make inserts for existing columns

I am loading initial data (url list for a crawler) to Cassandra with status crawled=0. Then using Hadoop I crawl all the links and try to change crawled from 0 to something else, for example 1 or 2, o[详细]

2023-03-25 10:25 分类：问答
Problem with -libjars in hadoop

I am trying to run MapReduce job on Hadoop but I am facing an error and I am not sure what is going wrong. I have to pas library jars which is required by my mapper.[详细]

2023-03-25 09:59 分类：问答
How to design my mapper?

I have to write a mapreduce job but I do开发者_如何学Pythonnt know how to go about it, I have jar MARD.jar through which I can instantiate MARD objects.[详细]

2023-03-25 09:52 分类：问答
php find max in 2 dimension array but return another element('id') of the array

here is my array sample $data[][]; Array( [0] => Array ( [id] => 1349 [rating1] => 1.9378838029981E-7[详细]

2023-03-25 08:30 分类：问答
Architecture and Design Document for the next generation MapReduce

I would like to know the details (archi开发者_如何学JAVAtecture and design documents) about the next generation Apache MapReduce. Where are the sources to get more information about it?It is the only[详细]

2023-03-25 08:14 分类：问答
How to create and read directories in Hadoop - Mapreduce Job working directory

I want to create a directory inside the working directory of a MapRedu开发者_运维百科ce job in Hadoop.[详细]

2023-03-24 09:16 分类：问答
Setting the number of map tasks and reduce tasks

I am currently running a job I fixed the number of map task to 20 but and getting a higher number. I also set the reduce task to zero but I am still getting a number other than zero. The total time fo[详细]

2023-03-24 05:12 分类：问答
selecting all the fields in a row using mapReduce

I am using mongoose with nodejs. I am using mapReduce to fetch data grouped by a field.So all it gives me as a collection is the key with the grouping field only from every row of database.[详细]

2023-03-24 03:26 分类：问答