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https://issues.apache.org/jira/browse/YARN-7351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16208580#comment-16208580
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Jian He commented on YARN-7351:
-------------------------------
The reason is because the implementation, it creates a new thread for every dns
query.
{code}
while (true) {
final SocketChannel socketChannel = serverSocketChannel.accept();
if (socketChannel != null) {
executor.submit(new Callable<Boolean>() {
@Override
public Boolean call() throws Exception {
nioTCPClient(socketChannel);
return true;
}
});
}
}
{code}
After the patch, the DNS process cpu usages drops from 100% to 0.1% on my Mac
> High CPU usage issue in RegistryDNS
> -----------------------------------
>
> Key: YARN-7351
> URL: https://issues.apache.org/jira/browse/YARN-7351
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Jian He
> Assignee: Jian He
> Attachments: YARN-7351.yarn-native-services.01.patch
>
>
> Thanks [~aw] for finding this issue.
> The current RegistryDNS implementation is always running on high CPU and
> pretty much eats one core.
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