HBase bulk load (using configureIncrementalLoad helper method) configures the job to create as many reducer task as the regions in the hbase table. So if there are few hundred regions then the job wou
I start a job on a Hadoop cluster using JobClient, which gives me a handle to a RunningJob. Is there a painless way to get the log output of just that particular job? Or do I have to write some code t
I have a Hadoop cluster with 18 data nodes. I restarted the name node over two hours ago and the name node is still in safe mod开发者_如何学运维e.
When running Hadoop in EC2, I seem to have two options: A: Manage the cluster myself, using the EC2-specific shell scripts that come with Hadoop.
I just followed the Hadoop(0.20.2) installation tutorial and did the set up. I can run map reduce program on the cluster through eclipse. Now my problem is how can I connect to Hadoop clusters from my
I am working on the parallelization an algorithm, which roughly does the following: Read several text documents with a total of 10k words.
I have a requirement that my mapper may in some cases produce a new key/value for another mapper to handle.Is there a sane way to do this?I\'ve thought about writing my own custom input format (queue?
Has anyone tried to install HUE on Ap开发者_高级运维ache Hadoop? We are using hadoop 0.20.2 and I want to know if anyone has had success with it before I invest time doing it. Any pointers would be ap
开发者_Go百科I want to do some computation with hadoop and mahout on my quad core machine, so I am using hadoop in pseudo-distributed mode.
Does Hadoop guarantee that differen开发者_JAVA百科t blocks from same file will be stored on different machines in the cluster? Obviously replicated blocks will be on different machines. No. If you loo
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