Search notes:
Node manager
Node managers
run on every
Hadoop node
in a
cluster
.
A
node manager
creates, supervises and terminates
containers
.
When a node manager starts up, it registers itself with the
resource manager
and periodically sends a heart beat to the resource manager.o
Capacity
The capacity of a node manager is
memory (
yarn.nodemanager.resource.memory-mb
)
number of vcores
Since a node manager (at minimum) allocates
yarn.scheduler.minimum-allocation-mb
per
container
, the number of containers a node manager concurrently manages is roughly:
yarn.nodemanager.resource.memory-mb
/
yarn.scheduler.minimum-allocation-mb
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