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https://issues.apache.org/jira/browse/YARN-5333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15399237#comment-15399237
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Rohith Sharma K S commented on YARN-5333:
-----------------------------------------
I just tried modifying the code, the below error I was talking that RMWebApp
start fails.
{noformat}
com.google.inject.CreationException: Unable to create injector, see the
following errors:
1) Binding to null instances is not allowed. Use toProvider(Providers.of(null))
if this is your intended behaviour.
at org.apache.hadoop.yarn.webapp.WebApps$Builder$2.configure(WebApps.java:335)
1 error
at
com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:466)
at
com.google.inject.internal.InternalInjectorCreator.initializeStatically(InternalInjectorCreator.java:155)
at
com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:107)
at com.google.inject.Guice.createInjector(Guice.java:96)
at com.google.inject.Guice.createInjector(Guice.java:73)
at com.google.inject.Guice.createInjector(Guice.java:62)
at org.apache.hadoop.yarn.webapp.WebApps$Builder.build(WebApps.java:331)
at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:372)
at
org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.startWepApp(ResourceManager.java:1025)
at
org.apache.hadoop.yarn.server.resourcemanager.MockRM.startWepApp(MockRM.java:909)
at
org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceStart(ResourceManager.java:1127)
at
org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
at
org.apache.hadoop.yarn.server.resourcemanager.TestRMHA.testRMDispatcherForHA(TestRMHA.java:333)
{noformat}
Apart from above, other point is RMWebService is started in StandBy RM where
in REST calls can be made. Since if we do not initialize active services, then
we could expect NPE from RMWebService. There are many more things to take care
if we go for initializing active services during transitionToActive.
> Some recovered apps are put into default queue when RM HA
> ---------------------------------------------------------
>
> Key: YARN-5333
> URL: https://issues.apache.org/jira/browse/YARN-5333
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Jun Gong
> Assignee: Jun Gong
> Attachments: YARN-5333.01.patch, YARN-5333.02.patch,
> YARN-5333.03.patch
>
>
> Enable RM HA and use FairScheduler,
> {{yarn.scheduler.fair.allow-undeclared-pools}} is set to false,
> {{yarn.scheduler.fair.user-as-default-queue}} is set to false.
> Reproduce steps:
> 1. Start two RMs.
> 2. After RMs are running, change both RM's file
> {{etc/hadoop/fair-scheduler.xml}}, then add some queues.
> 3. Submit some apps to the new added queues.
> 4. Stop the active RM, then the standby RM will transit to active and recover
> apps.
> However the new active RM will put recovered apps into default queue because
> it might have not loaded the new {{fair-scheduler.xml}}. We need call
> {{initScheduler}} before start active services or bring {{refreshAll()}} in
> front of {{rm.transitionToActive()}}. *It seems it is also important for
> other scheduler*.
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