slfan1989 commented on code in PR #5233:
URL: https://github.com/apache/hadoop/pull/5233#discussion_r1055236130
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/security/DelegationTokenRenewer.java:
##########
@@ -1017,12 +1017,26 @@ public void run() {
"Exhausted max retry attempts {} in token renewer "
+ "thread for {}",
tokenRenewerThreadRetryMaxAttempts,
evt.getApplicationId());
+ continue;
}
}
} catch (Exception e) {
LOG.info("Problem in submitting renew tasks in token renewer "
+ "thread.", e);
+ continue;
}
+
+ // For normally finished DT renew event, it should be removed from
futures.
+ futures.remove(evt);
+ }
+
+ // If the cluster is idle for some time, futures map is empty or no
event handler found which may still cause high CPU utilization
+ // Therefore a short nap should be added here.
+ try {
+ Thread.sleep(1000);
Review Comment:
This does not seem to be a good way to deal with it through thread sleep.
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