Allocating Memory for the MapR-FS 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-DB, you can set the -noDB option in to specify that 20% of the memory available should be allocated to MapR-FS service. If you can give more memory to MapR-FS, 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-FS, and Hadoop Services.