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https://issues.apache.org/jira/browse/YARN-11914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18048605#comment-18048605
]
Edward Capriolo commented on YARN-11914:
----------------------------------------
Something that might also needa ticket:
{code:java}
r2$QuotingInputFilter)
2025-12-31 19:27:38,849 ERROR [main]
org.apache.hadoop.mapreduce.v2.app.client.MRClientService: Webapps failed to
start. Ignoring for now:
java.lang.NullPointerException: Cannot invoke "Object.toString()" because the
return value of "java.util.Iterator.next()" is null
at org.apache.hadoop.util.StringUtils.join(StringUtils.java:1050)
at
org.apache.hadoop.yarn.server.webproxy.amfilter.AmFilterInitializer.initFilter(AmFilterInitializer.java:74)
at
org.apache.hadoop.http.HttpServer2.initializeWebServer(HttpServer2.java:802)
at org.apache.hadoop.http.HttpServer2.<init>(HttpServer2.java:737)
at org.apache.hadoop.http.HttpServer2.<init>(HttpServer2.java:136)
at
org.apache.hadoop.http.HttpServer2$Builder.build(HttpServer2.java:504)
at org.apache.hadoop.yarn.webapp.WebApps$Builder.build(WebApps.java:384)
at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:468)
at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:464)
at
org.apache.hadoop.mapreduce.v2.app.client.MRClientService.serviceStart(MRClientService.java:152)
at
org.apache.hadoop.service.AbstractService.start(AbstractService.java:195)
at
org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceStart(MRAppMaster.java:1289)
at
org.apache.hadoop.service.AbstractService.start(AbstractService.java:195)
--More-- (68% of 43669 bytes)
{code}
> Unknown host exceptions not well handled
> ----------------------------------------
>
> Key: YARN-11914
> URL: https://issues.apache.org/jira/browse/YARN-11914
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 3.4.2
> Reporter: Edward Capriolo
> Priority: Major
>
> {code:java}
> 025-12-31 16:58:33,844 ERROR [main]
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster
> java.lang.IllegalArgumentException: java.net.UnknownHostException: rm2
> at
> org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:479)
> at
> org.apache.hadoop.yarn.client.ClientRMProxy.getTokenService(ClientRMProxy.java:178)
> at
> org.apache.hadoop.yarn.client.ClientRMProxy.getAMRMTokenService(ClientRMProxy.java:163)
> at
> org.apache.hadoop.yarn.client.ClientRMProxy.setAMRMTokenService(ClientRMProxy.java:105)
> at
> org.apache.hadoop.yarn.client.ClientRMProxy.getRMAddress(ClientRMProxy.java:124)
> at
> org.apache.hadoop.yarn.client.ConfiguredRMFailoverProxyProvider.getProxyInternal(ConfiguredRMFailoverProxyProvider.java:79)
> at
> org.apache.hadoop.yarn.client.ConfiguredRMFailoverProxyProvider.getProxy(ConfiguredRMFailoverProxyProvider.java:93)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler$ProxyDescriptor.<init>(RetryInvocationHandler.java:202)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.<init>(RetryInvocationHandler.java:335)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.<init>(RetryInvocationHandler.java:329)
> at org.apache.hadoop.io.retry.RetryProxy.create(RetryProxy.java:61)
> at
> org.apache.hadoop.yarn.client.RMProxy.newProxyInstance(RMProxy.java:194)
> at
> org.apache.hadoop.yarn.client.RMProxy.createRMProxy(RMProxy.java:116)
> at
> org.apache.hadoop.yarn.client.ClientRMProxy.createRMProxy(ClientRMProxy.java:74)
> at
> org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator.createSchedulerProxy(RMCommunicator.java:312)
> at
> org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator.serviceStart(RMCommunicator.java:118)
> at
> org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator.serviceStart(RMContainerAllocator.java:280)
> at
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:195)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$ContainerAllocatorRouter.serviceStart(MRAppMaster.java:978)
> at
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:195)
> at
> org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:123)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceStart(MRAppMaster.java:1292)
> at
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:195)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$6.run(MRAppMaster.java:1768)
> at
> java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
> at java.base/javax.security.auth.Subject.doAs(Subject.java:439)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1953)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1764)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1685)
> Caused by: java.net.UnknownHostException: rm2
> ... 29 more
> {code}
> Not many java systems trap unknown host well. They assume that DNS is stable
> which for "raw iron" is usually correct. However with docker/ k8s host names
> vanish soon after the host. In the case above RM2 not existing causes yarn
> clients to be unable even though RM1 is up.
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