I want to tail an hdfs file programmatically using the org.apache.hadoop.fs.FileSystem API. Is there a way to tail the file using the API in a way which is equivalent to hadoop fs开发者_JS百科 -tail -
I am trying to access a data file from a public class, both of which are located within a JAR file. However, when I execute the 开发者_如何学JAVAjar on a Hadoop cluster, the system throws a FileNotFou
How effi开发者_如何学编程cient are opensource distributed computation frameworks like Hadoop? By efficiency, I mean CPU cycles that can be used for the \"actual job\" in tasks that are mostly pure com
I\'m running a streaming job in Hadoop (on Amazon\'s EMR) with the mapper and reducer written in Python. I want to know about the speed gains I would experience if I implement the same mapper and redu
I have a solution that can be parallelized, but I don\'t (yet) have experience with hadoop/nosql, and I\'m not sure which solution is best for my needs.In theory, if I had unlimited CPUs, my results s
I want my MapReduce program to read from the standard input strea开发者_StackOverflowm (System.in)
I have mapreduce job: my code Map class: public static class MapClass extends Mapper<Text, Text, Text, LongWritable> {
Is it possible to write a Hadoop-ready reduce function that can find the longes开发者_StackOverflow社区t run of 1s (only the length of the run)?
I was trying out the simplistic word count example for hadoop pipes. Unfortunately it is erroring out with java.lang.NullPointerException and /usr/lib64/libstdc++.so.6: no version information availabl
Please help with the \"-file\" option issue of hadoop streaming (mentioned in the link below). just to update, I know that the jar is already there, I am trying this after I tried hadoop-streaming for
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