Somebody please give explanation on namenode heap size and about NameNode new generation size. How to calculate and its uses .

[#1]

@Abhishek Kumar

NameNode heap size depends on many factors, such as the number of files, the number of blocks, and the load on the system. The following table provides recommendations for NameNode heap size configuration. These settings should work for typical Hadoop clusters in which the number of blocks is very close to the number of files.

The NewSize is usually set between 1/6 and 1/8 to 1/10 of the HeapSize but it can be tuned.

It is well described in the following doc:

https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.1/bk_command-line-installation/content/ref-80...