Robert Kanter created YARN-7262:
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Summary: Add a hierarchy into the ZKRMStateStore for delegation
token znodes to prevent jute buffer overflow
Key: YARN-7262
URL: https://issues.apache.org/jira/browse/YARN-7262
Project: Hadoop YARN
Issue Type: Improvement
Affects Versions: 2.6.0
Reporter: Robert Kanter
Assignee: Robert Kanter
We've seen users who are running into a problem where the RM is storing so many
delegation tokens in the {{ZKRMStateStore}} that the _listing_ of those znodes
is higher than the jute buffer. This is fine during operations, but becomes a
problem on a fail over because the RM will try to read in all of the token
znodes (i.e. call {{getChildren}} on the parent znode). This is particularly
bad because everything appears to be okay, but then if a failover occurs you
end up with no active RMs.
There was a similar problem with the Yarn application data that was fixed in
YARN-2962 by adding a (configurable) hierarchy of znodes so the RM could pull
subchildren without overflowing the jute buffer (though it's off by default).
We should add a hierarchy similar to that of YARN-2962, but for the delegation
token znodes.
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