Google Interview Question for Program Managers






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HD included in the service- each video can be stored in 2 ways- HD and non- HD version. Some temporary space for data conversion from HD to non HD. If cost of webspaceis1GB @ 5$, it would cost not more than 1$ for the company to host it including the maintainance. Now a 15 min HD video when freshly made from a DSLR would be around 1 GB and that of a cell phone would be around 500 MB. The non HD videos for 15 mins would cost us 100 MB on average. Avg upload speed So there should be a temporary buffer of around 1000 TB for one state (Assuming a upper limit of 10000 are uploading @ a particular moment(say use of buffer for 2-3 hrs @ an avg of 100 kbps) ). while 100000 non HD are being uploaded @ the same time which be around 3 hr @ 100kbps for 1 state. which would require 1700 GB of Buffer per state.

Considering the cost of 100 videos being uploaded. the converted videos- non hd- 100 MB is stored and HD- 500 MB (Assuming mp4). Assuming 20% of them are HD and remaining non HD. 100*.2*500+100*.8*100=18000mb which is 18 GB for 100 videos. it would be 18*x for x videos.

Assuming 1000 videos are uploaded on an average per day from 1 state of population 10million. 180GB per day.

- rahul reddy October 04, 2012 | Flag Reply
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@Saif: Definitely the internet is not a physical storage for data. Nonetheless the data is stored somewhere (some server, data warehouse etc.) and the question asks about that.

- Algo Visa September 07, 2011 | Flag Reply
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Google This Question ;)

- Hem September 13, 2011 | Flag Reply
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A good data farm running in a virtualised environment, where the the storage drives can be added per requirement.i would say a cluster of 1million boxes's in a distributed environment should be sufficient.

- tantrick September 18, 2011 | Flag Reply
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-1
of 1 vote

Internet is not a physical storage to store data.

- Saif September 07, 2011 | Flag Reply


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