mapreduce « hbase « Java Database Q&A





1. Hadoop mapreduce streaming from HBase    stackoverflow.com

I'm building a Hadoop (0.20.1) mapreduce job that uses HBase (0.20.1) as both the data source and data sink. I would like to write the job in Python which has required ...

2. is this architecture possible in Hadoop MR?    stackoverflow.com

Is the following architecture possible in Hadoop MapReduce? A distributed key-value store is used (HBase). So along with values, there would be a timestamp associated with the values. Map & Reduce tasks ...

3. How to pick random (small) data samples using Map/Reduce?    stackoverflow.com

I want to write a map/reduce job to select a number of random samples from a large dataset based on a row level condition. I want to minimize the number of ...

4. Adjacency List structure in HBase    stackoverflow.com

I'm trying to implement the following graph reduction algorithm in

  • The graph is an undirected weighted graph
  • I want to strip away all nodes with only two neighbors
  • and update the weights
Have a look ...

5. Where can I find a HBase cascading module for hbase-0.89.20100924+28?    stackoverflow.com

I am working on a project using map reduce and HBase. We are using Cloudera’s CDH3 distribution which has hbase-0.89.20100924+28 bundled into it. I would like to use cascading as we have some ...

6. HBase Mapreduce on multiple scan objects    stackoverflow.com

I am just trying to evaluate HBase for some of data analysis stuff we are doing. HBase would contain our event data. Key would be eventId + time. We want to ...

7. MapReduce on Hbase using Thrift in .NET?    stackoverflow.com

Can i use Hadoop Streaming to Run MapReduce jobs on HBase using thrift in .NET? Or is there any other way to run MapReduce jobs on HBase from .NET?

8. Does HBase MapReduce support a combiner stage? And if so, how?    stackoverflow.com

Hadoop map reduce supports a combiner stage. However, I can't find a similar capability in the HBase MapReduce package. Does it exist?

9. Writing to HBase in MapReduce using MultipleOutputs    stackoverflow.com

I currently have a MapReduce job that uses MultipleOutputs to send data to several HDFS locations. After that completes, I am using HBase client calls (outside of MR) to add ...





10. How does HBase mapreduce job communicate with server? (newbie question)    stackoverflow.com

I am new to Hadoop and HBase and even though I've read allot, I still don't understand the basic hierarchy and workflow of map reduce job API. By what I understand, I ...

11. HBase: how to unit test HBase Map/Reduce    stackoverflow.com

I want to unit test HBase reducer which I wrote in Java and my question is what is the best way to do it (best way = easy and fast)? I found ...

12. Writing an Hbase Result object out to SequenceFile from Reducer    stackoverflow.com

I'm trying to output an Hbase Result object (same one I received in the TableMapper) from the Reducer of my MR Job using SequenceFileOutputFormat. It looks like the SequenceFileOutputFormat is trying ...

13. Hadoop: implement interfaces from o.a.h.mapred, or extend classes from o.a.h.mapreduce?    stackoverflow.com

I'm learning Hadoop (0.20.205) and I'm a little bit confused. Which way is recommended: A) Implement Mapper and Reducer interfaces from org.apache.hadoop.mapred, and configure the job using JobConf, as in the ...

14. Passing the results of multiple sequential HBase queries to a Mapreduce job    stackoverflow.com

I have an HBase database that stores adjacency lists for a directed graph, with the edges in each direction stored in a pair of column families, where each row denotes a ...