Importance of MapReduce in Hadoop
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From this blog, I am going to introduce to you Importance of
MapReduce in Hadoop Why MapReduce is the main part in Big Data. Before going
ahead, I would suggest you get familiar with HFDS. This concept will help to
quickly analyze the MapReduce. If anyone interested to learn HFDC, go with my
previous blog. After studying HFDS still, you have any doubts then get in touch
with us click on above link. In below, we discuss Importance of MapReduce in
Hadoop
Importance of MapReduce in Hadoop
Let’s take a look on this blog. MapReduce is a processing
layer which can allow the large data and divided in the independent task.
Assume if we don’t have MapReduce concept in Big Data. What will happen? It’s
very difficult to complete the task without MapReduce concept. It is a heart of
the Big Data. In MapReduce, we can put a business logic, the rest of the thing
care by the framework. The process of MapReduce is work which will assign by
the user to master. The work can divide into parts and assigned to slaves.
Here in MapReduce, we get inputs from the list and it
coverts output which again lists. Due to
MapReduce, Hadoop is more powerful and efficient. This is what a small
overview of MapReduce, take a look on know how to divide work into sub work and
how MapReduce works. In this process, the total work divided into small
divisions. Each division will process in parallel on the clusters of servers
which can give individual output. And finally, these individual outputs give
the final output. It is scalable and can use across many computers.
Terminologies and concepts of MapReduce
Let’s see the different terminologies of MapReduce. what are
the job, task, and attempt? MapReduce program transforms the lists of inputs
into lists of outputs. There are small phase called sort and shuffle in between
Map and Reduce.
MapReduce job: It is an execution of Mapper and Reducer
across the data. The output will come from the two layers Mapper and Reducer.
In this process, which contains input data, Map Reduce program and set the
configuration. So, the client(she/he) needs to submit data, the MapReduce
program to and set configuration. The task of MapReduce is getting output from
the Mapper or a Reducer. Task-In-Progress means processing the data is in
progress with either Mapper or Reducer. We can execute a task in a particular
attempt is called Task Attempts. Suppose, when we are working suddenly machine
can be down. In that time framework reschedule to another node. The task
attempt has a default value that is 4. For example, the task would fails times
then the job is to consider to fail. We can increase the task attempt for high
priority job.
How Map and Reduce work together?
Importance of MapReduce in Hadoop
The mapper can receive input and proceed through the
user-defined functions. In Mapper, all complicated logic will implement. So, a
heavy process will complete in Mapper compare to Reducers. The output coming
from the Mapper is called Intermediate data and this output goes input to the
reducer. This result is processed by the user-defined functions were written
reducer. Finally, the result will come out. Through this blog, I explain the
Importance of MapReduce in Hadoop This was all about the Importance of
MapReduce in Hadoop.[Source]-https://onlineitguru.com/blog/importance-of-map-reduce-in-hadoop
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