Robert Kanter created YARN-7262: ----------------------------------- 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. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: yarn-dev-unsubscr...@hadoop.apache.org For additional commands, e-mail: yarn-dev-h...@hadoop.apache.org