When you run
configure.sh on a node, warden allocates memory for the operating system,
mfs service, MapR Hadoop services, and applications using the settings in the
Warden allocates memory to the following components in the following order:
- Operating system
- MapR Hadoop services
- Jobs and Applications, such as MapReduce v1 or YARN applications
- If NodeManager is not installed on the node, the remaining available memory is allocated to the MapR file system. If NodeManager is installed on the node, the remaining available memory is allocated to run YARN applications.
In general, you should not modify the settings in the warden files. However, if you modify the values in
warden.conf or a
warden.<servicename>.conf file, you must restart warden. Otherwise, updated parameters will not be used to allocate resources
Memory for the OS,
mfs Service, and Hadoop Services
The warden allocates memory to the operating system,
mfs service, and MapR Hadoop services based on the following parameters:
|varies||Defines the heap size percentage.|
|4000||85||5000||Defines the maximum heap size in MB.|
|service.command. <os|mfs|servicename>.heapsize.min||256||512||256||Defines the minimum heap size in MB.|
The memory settings for the operating system,
mfs service, and Hadoop services such as TaskTracker and JobTracker, are configured in the warden.conf file. The warden.conf file is located in
/opt/mapr/conf. Other services such as NodeManager and ResourceManager have their own
warden.<servicename>.conf file within
/opt/mapr/conf/conf.d. For more information about the warden files, see
Note: Warden only allocates resources for MapR Hadoop services associated with roles that are installed on the node.
Memory for the
By default, Warden adds up the total memory consumed by all services and the OS and then gives 85% of what is left to the
mfs service. If you do not intend to use MapR-DB, you can set the
-noDB option in
configure.sh to specify that 20% of the memory available should be allocated to mfs service.
Memory for Jobs and Applications
Warden allocates memory to MapReduce v1 jobs and applications based on the services installed on the node and also the
mr1.memory.percent value in
warden.conf. For more information, see Resource Allocation for Jobs and Applications.