mapreduce
MongoDB MapReduce problem, in codeigniter
I am using mongodb in codeigniter. collections \'mtb\' \'road\' \'minivelo\' php $map = new MongoCode(\' function(){[详细]
2023-03-27 13:59 分类：问答Does anyone have experience use MapReduce to solve network flow problem
MapReduce has been shown to be powerful solve problem with large data sets in a parallel/distributed way.[详细]
2023-03-27 13:27 分类：问答shared variable in map reduce
I need a variable that shared between reduce tasks and each of reduce tasks ca开发者_运维百科n read and write on it atomically.[详细]
2023-03-27 05:05 分类：问答Cassandra InvalidRequestException(why:[MyKeyspace][MyColumnFamily][6675...6c74] = [6c86......e65720] failed validation (String didn't validate.))
I am using Cassandra with Hadoop for input and output. During the output reduce job, I got an error: 2011-08-10 03:54:04,326 WARN org.apache.hadoop.mapred.Child: Error running child[详细]
2023-03-27 04:26 分类：问答Cassandra setInputSplitSize is not working properly
I am using Hadoop + Cassandra. I use setInputSplitSize(1000) to not overload mappers (and receive out of heap memory) as default it is 64K. All 开发者_StackOverflow社区together I have only 2M lines to[详细]
2023-03-27 01:05 分类：问答hadoop : 1 map multiple reducers with each reducer having different functionality? possible?
Here is an example: Is it possible to have same mapper run against multiple reducers at the same time? like[详细]
2023-03-26 23:15 分类：问答MongoDB map-reduce slow and runs out of memory
I would like to use MongoDB as the backend for the analytics system I am building. One of the main advantages of using MongoDB is the built-in map reduce.[详细]
2023-03-26 20:49 分类：问答Best practices for using Oozie for Hadoop
I have been using Hadoop quite a while now. After some time I realized I n开发者_高级运维eed to chain Hadoop jobs, and have some type of workflow. I decided to use Oozie , but couldn\'t find much of i[详细]
2023-03-26 12:23 分类：问答How to print on console during MapReduce job execution in hadoop
开发者_如何学GoI want to print each step of my \"map\" after its execution on the console. Something like[详细]
2023-03-26 09:25 分类：问答mongodb getting the oldest of animals map/reduce
I\'ve never tried map/reduce. How would I get the oldest of each type of animal? My data is like this: [[详细]
2023-03-26 05:31 分类：问答
![Interactive visualization of a graph in python [closed]](https://www.devze.com/res/2023/04-10/09/92d32fe8c0d22fb96bd6f6e8b7d1f457.gif)
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