András Győri created YARN-11152:
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Summary: QueueMetrics is leaking memory when creating a new queue
during reinitialisation
Key: YARN-11152
URL: https://issues.apache.org/jira/browse/YARN-11152
Project: Hadoop YARN
Issue Type: Bug
Components: capacity scheduler
Reporter: András Győri
Assignee: András Győri
Capacity Scheduler handles reinitialisation by reparsing the entire queue
hierarchy, then reinitialising the old queue hierarchy by taking the newly
parsed queues into account. After this, the newly parsed queues are discarded
and they are GCed.
However, with the introduction of YARN-6492, we are storing a parent queue in
QueueMetrics, which is problematic, because at that point, the parent queue
could still point to a parent reference, that is a newly parsed parent queue
(which should be discarded after the reinitialisation). Due to this fact,
QueueMetrics could contain parents members of an entirely different queue
hierarchy than the current hierarchy in use. It could lead to subtle problems
as well as memory leak, because one parent reference will keep the whole queue
hierarchy alive.
This problem arised when we programatically added one queue after an other via
the mutation API, thus keeping alive hundreds of queue hierarchies at the same
time, crippling the GC and the whole RM.
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