Hadoop

Question 1
​Which of the following statement/s is/are true ?
(i) Facebook has the world’s largest Hadoop cluster.
(ii) Hadoop 2.0 allows live stream processing of real time data
A
Neither (i) nor (ii)
B
Both (i) and (ii)
C
(i) only
D
(ii) only
       Big-Data       Hadoop       UGC NET CS 2018-DEC Paper-2
Question 1 Explanation: 
→ The Data warehouse Hadoop cluster at Facebook has become the largest known Hadoop storage cluster in the world.
Here are some of the details about this single HDFS cluster:
1. 21 PB of storage in a single HDFS cluster
2. 2000 machines
3. 12 TB per machine (a few machines have 24 TB each)
4. 1200 machines with 8 cores each + 800 machines with 16 cores each
5. 32 GB of RAM per machine
6. 15 map-reduce tasks per machine
That's a total of more than 21 PB of configured storage capacity! This is larger than the previously known Yahoo!'s cluster of 14 PB.
→ Hadoop 2.0 allows live stream processing of real time data
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