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https://issues.apache.org/jira/browse/YARN-4024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16038399#comment-16038399
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maobaolong commented on YARN-4024:
----------------------------------
[~zhiguohong]
Thanks for this great improvement, i have a minor question.
{code:java}
public void handle(NodesListManagerEvent event) {
RMNode eventNode = event.getNode();
switch (event.getType()) {
case NODE_UNUSABLE:
LOG.debug(eventNode + " reported unusable");
unusableRMNodesConcurrentSet.add(eventNode);
for(RMApp app: rmContext.getRMApps().values()) {
if (!app.isAppFinalStateStored()) {
this.rmContext
.getDispatcher()
.getEventHandler()
.handle(
new RMAppNodeUpdateEvent(app.getApplicationId(), eventNode,
RMAppNodeUpdateType.NODE_UNUSABLE));
}
}
break;
case NODE_USABLE:
if (unusableRMNodesConcurrentSet.contains(eventNode)) {
LOG.debug(eventNode + " reported usable");
unusableRMNodesConcurrentSet.remove(eventNode);
}
for (RMApp app : rmContext.getRMApps().values()) {
if (!app.isAppFinalStateStored()) {
this.rmContext
.getDispatcher()
.getEventHandler()
.handle(
new RMAppNodeUpdateEvent(app.getApplicationId(), eventNode,
RMAppNodeUpdateType.NODE_USABLE));
}
}
break;
default:
LOG.error("Ignoring invalid eventtype " + event.getType());
}
// remove the cache of normalized hostname if enabled
if (resolver instanceof CachedResolver) {
((CachedResolver)resolver).removeFromCache(
eventNode.getNodeID().getHost());
}
}
{code}
As the handle method ahead, i see the removeFromCache method will be invoke
when handle method is called and no matter whether the event type is valid. Do
you think a return in the end of the default block is correct?
Or you can removeFromCache definitely when the event type is NODE_UNUSABLE or
NODE_USABLE.
> YARN RM should avoid unnecessary resolving IP when NMs doing heartbeat
> ----------------------------------------------------------------------
>
> Key: YARN-4024
> URL: https://issues.apache.org/jira/browse/YARN-4024
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: resourcemanager
> Reporter: Wangda Tan
> Assignee: Hong Zhiguo
> Fix For: 2.8.0, 3.0.0-alpha1
>
> Attachments: YARN-4024-draft.patch, YARN-4024-draft-v2.patch,
> YARN-4024-draft-v3.patch, YARN-4024-v4.patch, YARN-4024-v5.patch,
> YARN-4024-v6.patch, YARN-4024-v7.patch
>
>
> Currently, YARN RM NodesListManager will resolve IP address every time when
> node doing heartbeat. When DNS server becomes slow, NM heartbeat will be
> blocked and cannot make progress.
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