in Big Data | Hadoop by
Q:

Where is the output of Mapper written in Hadoop?

1 Answer

0 votes
by

The output of mappers are written on local disk rather than the HDFS Blocks. Because of the following reasons :

There are 2 levels of processing (Map and Reduce) involved to get the final desired outcome.
The result generated by mappers are just intermediate/temporary result which is intern result to the Reducers so writing this would be costly process and inefficient.

The final result (outcome of reducers) is stored on HDFS block.

Follow the link to learn more about Mappers in Hadoop

Related questions

0 votes
asked Jan 7, 2020 in Big Data | Hadoop by sharadyadav1986
  • #hdfs-output
0 votes
asked Jan 8, 2020 in Big Data | Hadoop by GeorgeBell
0 votes
asked Mar 22, 2020 in Big Data | Hadoop by SakshiSharma
...