hive

http://en.wikipedia.org/wiki/Apache_Hive

HDFS=hadoop distributed file system

Hadoop = HDFS + MapReduce

Hive = provide a SQL layer over HDFS or other file system

 

Apache Giraph is an Apache project to perform graph processing on big data. Giraph utilizes Apache Hadoop‘s MapReduce implementation to process graphs. Facebook used Giraph with some performance improvements to analyze one trillion edges using 200 machines in 4 minute

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