hey all, just getting started on hadoop and curious what the best way in mapreduce would be to count unique visitors if your logfiles looked like this...
The output from MongoDB\'s map/reduce includes something like \'counts\': {\'input\': I, \'emit\': E, \'output\': O}. I thought I clearly understand what those mean, until I hit a weird case which I c
I have a quick Hadoop Streaming question. If I\'m using Python streaming and I have Python packages that my mappers/reducers require but aren\'t installed by default do I need to install those on all
My program follows a iterative map/reduce approach. And it needs to stop if certain conditions are met. Is there anyway i can set a global variable that can be distributed across all map/reduce tasks
Why do we use MapReduce? and what a开发者_如何学编程re some use cases?The classic example is counting the occurrence of words in a very large collection of documents.You can use the map step to genera
Do you know of any python mapreduce ready clustering libraries? I have found some good libraries in Java (http://lucene.apache.org/mahout/), I\'d prefer to use python though.
Just fini开发者_运维知识库shed reading ch23 in the excellent \'Beautiful Code\' http://oreilly.com/catalog/9780596510046
I need something slightly more complex than the examples in the MongoDB docs and I can\'开发者_运维知识库t seem to be able to wrap my head around it.
This is a conceptual question involving Hadoop/HDFS. Lets say you have a file containing 1 billion lines. And for the sake of simplicity, lets consider that each line is of the form <k,v> where
I launched a hadoop cluster and submitted a job to the master. The jar file is only contained in the master. Does hadoop s开发者_如何学Chip the jar to all the slave machines at the start of the job? I
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