Allocating Memory for the MapR Filesystem Service

By default, Warden adds up the total memory consumed by all services and the OS and then gives 85% of what is left to YARN. If you do not intend to use MapR Database, you can set the -noDB option in to specify that 20% of the memory available should be allocated to MapR Filesystem service. If you can give more memory to MapR Filesystem, performance improves due to greater data caching. If your main constraint is disk I/O, this is especially important. For the parameters that you can configure to give Warden more memory, see Allocating Memory for the OS, MapR Filesystem, and Hadoop Services.