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https://issues.apache.org/jira/browse/YARN-9075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16719307#comment-16719307
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Wangda Tan commented on YARN-9075:
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Thanks [~billie.rinaldi],
The overall code flow looks good to me.
Some comments for implementations:
1)
org.apache.hadoop.yarn.server.nodemanager.containermanager.AuxServices#loadManifest,
First I suggest to make all methods which will change internal data structure
to synchronized method. Unless you feel there will be some performance issues,
I would prefer to make it simpler.
And inside the method, I found service could be started before it added to
serviceMap. Is it possible that service could "leak" when some issues happen
for other services (like throw RuntimeException AuxServices#initAuxService).
To make it simpler, I suggest to change the code flow to:
{code:java}
foreach (service : configured-service):
if (serviceMap.contains(newService)):
stop old service
Service newService = load-and-start-service
serviceMap.add(newService){code}
This can avoid leaking services.
And it seems service will be stopped twice in existing logic, inside
initAuxService and after all service initializations:
{code:java}
if (!loadedAuxServices.contains(entry.getKey())) {
foundChanges = true;
stopAuxService(entry.getValue());
it.remove();
}{code}
2) Why change ShuffleHandler?
3) Could u provide an example file for shuffle service manifest json file? We
need to file a separate Jira for documentation changes.
> Dynamically add or remove auxiliary services
> --------------------------------------------
>
> Key: YARN-9075
> URL: https://issues.apache.org/jira/browse/YARN-9075
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: nodemanager
> Reporter: Billie Rinaldi
> Assignee: Billie Rinaldi
> Priority: Major
> Attachments: YARN-9075.001.patch, YARN-9075.002.patch,
> YARN-9075.003.patch, YARN-9075_Dynamic_Aux_Services_V1.pdf
>
>
> It would be useful to support adding, removing, or updating auxiliary
> services without requiring a restart of NMs.
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