I am trying to run hadoop as a root user, i executed namenode format command hadoop namenode -format when the Hadoop file system is running. After this, when i try to start the name node server, it ...

I hope I m asking this in the right way. I m learning my way around Elastic MapReduce and I ve seen numerous references to the "Aggregate" reducer that can be used with "Streaming" job flows. In ...

I have checked-out a project from SourceForge named HadoopDB. It uses some class in another project named Hive. I have used Eclipse Java build path setting to link source to the Hive project root ...

I am researching Hadoop to see which of its products suits our need for quick queries against large data sets (billions of records per set) The queries will be performed against chip sequencing data. ...

I am implementing a Hadoop Map reduce job that needs to create output in multiple S3 objects. Hadoop itself creates only a single output file (an S3 object) but I need to partition the output into ...

I m very new to Hadoop and I m currently trying to join two sources of data where the key is an interval (say [date-begin/date-end]). For example: input1: 20091001-20091002 A 20091011-20091104 ...

Is there a way to determine if a file in hadoop is being written to? eg- I have a process that puts logs into hdfs. I have another process that monitors for the existence of new logs in hdfs, but I ...

I am trying out the Apache Hive as per http://wiki.apache.org/hadoop/Hive/GettingStarted and am getting this error from Ivy: Downloaded file size doesn t match expected Content Length for http://...