Tuning HDFS
In the previous few recipes, we tuned the operating system, disks, and network setting for the installation of Hadoop.
In this recipe, we will tune HDFS for best performance. As stated initially, the HDFS read/write performance on a node with a slow disk and resource constraints will be slower compared to a node having a faster disk, CPU, and RAM. Tuning is always a layered approach, tuning each layer in conjunction to come to a final result.
Getting ready
To complete the recipe, the user must have a running cluster with HDFS and YARN setup. Users can refer to Chapter 1, Hadoop Architecture and Deployment, on installation details.
The assumption here is that the user is well familiar with HDFS concepts and knows its layout. Please read the Tuning the disk recipe, as HDFS will be a pseudo-file system of a native EXT4 or XFS filesystem.
How to do it...
Connect to the Namenode
master1.cyrus.comand switch to userhadoop.Edit the file
hdfs-site.xmland change the HDFS block size to be...
