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Hadoop is Big, I mean really BIG

Hadoop, for those not up on it, is a top level Apache project. That means it's right up there with the Apache Web Server in terms of importance.

Hadoop allows you to distribute data-intensive applications across many nodes. These nodes can scale across many machines and sift through peta-bytes of data very quickly.

Deepak Singh has collected some massive data stats on extreme Hadoop
uses, by some of the leading Web companies:

Facebook

  • 36 PB of uncompressed data
  • 2250 machines
  • 23,000 cores
  • 32 GB of RAM per machine
  • processing 80-90TB/day

Yahoo

  • 70 PB of data in HDFS
  • 170 PB spread across the globe
  • 34000 servers
  • Processing 3 PB per day
  • 120 TB flow through Hadoop every day

Twitter

  • 7 TB/day into HDFS

LinkedIn

  • 120 Billion relationships
  • 82 Hadoop jobs daily (IIRC)
  • 16 TB of intermedia data.