IT Interview Questions and Answers

Dear All Friends, Here I am trying to present all IT Subject related and IT field related Interview Question-Answer and Study Materials, Blogs etc...

Sunday, June 1, 2014

Can Hadoop be compared to NOSQL database like Cassandra?

Though NOSQL is the closet technology that can be compared to Hadoop, it has its own pros and cons. There is no DFS in NOSQL. Hadoop is ...

Why ‘Reading‘ is done in parallel and ‘Writing‘ is not in HDFS?

Reading is done in parallel because by doing so we can access the data fast. But we do not perform the write operation in parallel. The...

Which are the two types of ‘writes’ in HDFS?

There are two types of writes in HDFS: posted and non-posted write . Posted Write is when we write it and forget about it, without worryi...

Is a job split into maps?

No, a job is not split into maps. Spilt is created for the file. The file is placed on datanodes in blocks. For each split, a map is need...

Why are the number of splits equal to the number of maps?

The number of maps is equal to the number of input splits because we want the key and value pairs of all the input splits.

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