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https://issues.apache.org/jira/browse/YARN-11924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18055878#comment-18055878
]
ASF GitHub Bot commented on YARN-11924:
---------------------------------------
Hean-Chhinling commented on code in PR #8222:
URL: https://github.com/apache/hadoop/pull/8222#discussion_r2753375105
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java:
##########
@@ -1007,6 +1007,16 @@ public static boolean isAclEnabled(Configuration conf) {
public static final String DEFAULT_RM_SCHEDCONF_STORE_ZK_PARENT_PATH =
"/confstore";
+ /** Retry period for ZKConfigurationStore will create znodes. */
+ @Private
+ @Unstable
Review Comment:
Last time when I clicked it, it did not go through. Now it did.
Seems like these annotation is used to inform users how much they should
trust on certain configuration for the new releases. And Unstable is used for
private configuration e.g. for YARN RM only (from my understanding)
> Add zkManager.exists(path) check to ZKConfigurationStore:getZkData() and
> retry mechanism
> ----------------------------------------------------------------------------------------
>
> Key: YARN-11924
> URL: https://issues.apache.org/jira/browse/YARN-11924
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Ferenc Erdelyi
> Assignee: Ferenc Erdelyi
> Priority: Major
> Labels: pull-request-available
>
> Should a "yarn resourcemanager -format-state-store" command be issued while
> one of the RM is starting and in the INIT state (because of YARN-11551),
> there is a time period when the /confstore/CONF_STORE path does not exist,
> hence the getZkData method returns a null value, causing the RM to fail. To
> prevent this, add a check and re-try mechanism before giving up.
>
> {code:java}
> FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error
> starting ResourceManagerorg.apache.hadoop.service.ServiceStateException:
> org.apache.hadoop.yarn.exceptions.YarnException: Failed to initialize queues
> at
> org.apache.hadoop.service.ServiceStateException.convert(ServiceStateException.java:105)
> at
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:173)
> at
> org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:108)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$RMActiveServices.serviceInit(ResourceManager.java:875)
> at org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.createAndInitActiveServices(ResourceManager.java:1293)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceInit(ResourceManager.java:334)
> at org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1580)Caused
> by: org.apache.hadoop.yarn.exceptions.YarnException: Failed to initialize
> queues at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.initializeQueues(CapacityScheduler.java:738)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.initScheduler(CapacityScheduler.java:312)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.serviceInit(CapacityScheduler.java:403)
> at
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
> ... 7 moreCaused by: java.lang.IllegalStateException: Queue configuration
> missing child queue names for root at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerQueueManager.validateParent(CapacitySchedulerQueueManager.java:741)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerQueueManager.parseQueue(CapacitySchedulerQueueManager.java:255)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerQueueManager.initializeQueues(CapacitySchedulerQueueManager.java:177)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.initializeQueues(CapacityScheduler.java:729)
> ... 10 more {code}
>
> As a troubleshooting step, I've added locks, and this is the point when
> noticed that the underlying issue is an NPE:
>
> {code:java}
> 2026-01-26 16:19:54,961 INFO
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.conf.ZKConfigurationStore:
> ZK confstore is locked for reading. Readers can access it.2026-01-26
> 16:19:54,962 ERROR
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.conf.ZKConfigurationStore:
> Failed to retrieve configuration from zookeeper
> storeorg.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode =
> NoNode for /confstore/CONF_STORE at
> org.apache.zookeeper.KeeperException.create(KeeperException.java:118)
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:54) at
> org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1972) at
> org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:327)
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:316)
> at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:93)
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl.pathInForeground(GetDataBuilderImpl.java:313)
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:304)
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:35)
> at
> org.apache.hadoop.util.curator.ZKCuratorManager.getData(ZKCuratorManager.java:240)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.conf.ZKConfigurationStore.getZkData(ZKConfigurationStore.java:334)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.conf.ZKConfigurationStore.retrieve(ZKConfigurationStore.java:272)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.conf.MutableCSConfigurationProvider.init(MutableCSConfigurationProvider.java:83)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.initScheduler(CapacityScheduler.java:302)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.serviceInit(CapacityScheduler.java:413)
> at
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:165)
> at
> org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:110)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$RMActiveServices.serviceInit(ResourceManager.java:995)
> at org.apache.hadoop.service.AbstractService.init(AbstractService.java:165)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.createAndInitActiveServices(ResourceManager.java:1508)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceInit(ResourceManager.java:351)
> at org.apache.hadoop.service.AbstractService.init(AbstractService.java:165)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1797)2026-01-26
> 16:19:54,966 INFO
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.ConfigurationMutationACLPolicyFactory:
> Using ConfigurationMutationACLPolicy implementation - class
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.DefaultConfigurationMutationACLPolicy2026-01-26
> 16:19:54,966 INFO org.apache.hadoop.service.AbstractService: Service
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler
> failed in state INITEDjava.lang.NullPointerException: Cannot enter
> synchronized block because "other" is null at
> org.apache.hadoop.conf.Configuration.<init>(Configuration.java:845) at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.conf.MutableCSConfigurationProvider.loadConfiguration(MutableCSConfigurationProvider.java:102)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.initScheduler(CapacityScheduler.java:303)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.serviceInit(CapacityScheduler.java:413)
> at
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:165)
> at
> org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:110)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$RMActiveServices.serviceInit(ResourceManager.java:995)
> at org.apache.hadoop.service.AbstractService.init(AbstractService.java:165)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.createAndInitActiveServices(ResourceManager.java:1508)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceInit(ResourceManager.java:351)
> at org.apache.hadoop.service.AbstractService.init(AbstractService.java:165)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1797)
> {code}
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