hadoop - What happens to orphaned Yarn Child processes? -

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hadoop yarn launches instances of yarnchild in child vm execute actual tasks. tasks communicate applicationmaster (am) through umbilical interface.

my question happens if dies , resource manager(rm) fails bring (say, due code defect in am)? in such case, children tasks (a) note absence of due heartbeat , then, (b) go rm new location, in case not get. so, happens these orphaned tasks? have scenario terminate them. default behavior , nodemanager (nm) terminate them?

from hadoop -definitive guide, chapter 6, failures, failures in yarn

after crash, new resource manager instance brought up(by admin), , recovers saved state. state consists of node managers in system, running applications. here tasks not part of resource managers state, managed application.

also, said resource manager designed able recover crashes.


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