mapreduce

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Running Hadoop MapReduce, is it possible to call external executables outside of HDFS

Within my mapper I\'d like to call external software installed on the worker node outside of the HDFS.Is this possible?What is the best way to do this?[详细]

2023-04-01 23:07 分类：问答
RavenDB index with map reduce distinct [closed]

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time,or an extraordinarily narrow situation that is not generally applic[详细]

2023-04-01 18:15 分类：问答
couchdb map-reduce and grouping

I am attempting to get a count of unique events for an object (lets say a video): Here are my documents:[详细]

2023-04-01 09:01 分类：问答
In MongoDB mapreduce, how can I flatten the values object?

I\'m trying to use MongoDB to analyse Apache log files. I\'ve created a receipts collection from the Apache access logs. Here\'s an abridged summary of what my models look like:[详细]

2023-04-01 05:39 分类：问答
Why is the right number of reduces in Hadoop 0.95 or 1.75?

The hadoop documentation states: The right number of reduces seems to be 0.95 or 1.75 multiplied by ( * mapred.tasktracker.reduce.tasks.maximum).[详细]

2023-04-01 00:44 分类：问答
mongodb: emulating couchdb's incremental map reduce

Are there any techniques for emulating couchdb\'s incremental MapReduce in Mongodb. Essentially, we want to a periodic map reduce to only touch new documents in a collection.[详细]

2023-03-31 14:47 分类：问答
Extreme amount of overhead in simple MapReduce job

I\'m experimenting with Hadoop and created a very simply map and reduce job. The input is a 30 line text file, and the output is only 3 lines (it\'s an excerpt of a log file, where the map extracts a[详细]

2023-03-31 12:44 分类：问答
Custom MapReduce Input Format - Can't Find Constructor

I\'m writing a custom InputFormat for Hadoop 0.20.2 and am running into a NoSuchMethodException I can\'t get rid of.I started with:[详细]

2023-03-30 12:51 分类：问答
How to call getServletContext() equivalent in AppEngineMapper derived class?

I have a Mapper class which extends AppEngineMapper<Key, Entity, NullWritable, 开发者_高级运维NullWritable>.[详细]

2023-03-30 03:42 分类：问答
running hadoop on Google app engine?

Is it possible to run map reduce jobs on Google app engine? Any reference or tu开发者_如何转开发torial would help[详细]

2023-03-28 20:35 分类：问答