Benjamin Teke created YARN-11743:
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Summary: Cgroup v2 support should fall back to v1 when there are
no v2 controllers
Key: YARN-11743
URL: https://issues.apache.org/jira/browse/YARN-11743
Project: Hadoop YARN
Issue Type: Sub-task
Components: yarn
Reporter: Benjamin Teke
Cgroup v1/v2 mixed mode support was introduced in YARN-11692, however it does
not support an edgecase where NM has the cgroup v2 support enabled (using
{{yarn.nodemanager.linux-container-executor.cgroups.v2.enabled}} set to true),
but there are only cgroup v1 controllers mounted. In larger clusters there is a
chance that some part of the cluster is already on newer OSes with cgroup v2 as
a default, and others are still using v1.
Currently trying to launch an NM with cgroup v2 support enabled will fail if
there are no cgroup.controllers file present.
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