Hadoop notes

README.md

Hive number of files and sizes

http://www.openkb.info/2014/12/how-to-control-file-numbers-of-hive.html

MapReduce split size and mapper

https://www.jianshu.com/p/af5ff4c3348f

https://blog.cloudera.com/blog/2009/12/7-tips-for-improving-mapreduce-performance/

https://blog.matthewrathbone.com/2016/09/01/a-beginners-guide-to-hadoop-storage-formats.html

https://stackoverflow.com/questions/43922016/what-is-meant-by-a-compression-codecs-splittability-in-the-context-of-hadoop

https://blog.cloudera.com/blog/2011/09/snappy-and-hadoop/

https://stackoverflow.com/questions/32382352/is-snappy-splittable-or-not-splittable

https://community.hortonworks.com/questions/32459/how-a-huge-compressed-file-will-get-stored-in-hdfs.html