Syed Shameerur Rahman created YARN-11838:
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Summary: YARN ConcurrentModificationException When Refreshing Node
Attributes
Key: YARN-11838
URL: https://issues.apache.org/jira/browse/YARN-11838
Project: Hadoop YARN
Issue Type: Bug
Components: nodeattibute, yarn
Affects Versions: 3.2.1, 3.3.0
Reporter: Syed Shameerur Rahman
Assignee: Syed Shameerur Rahman
h2. The Problem Flow
# A new node is being added to the cluster (NODE_ADDED event)
# The CapacityScheduler calls addNode() method
# This triggers refreshNodeAttributesToScheduler() in NodeAttributesManagerImpl
# During this process, the code attempts to convert a HashMap to a string for
logging
# While iterating through the HashMap for string conversion, another thread
modifies the same HashMap :
https://github.com/apache/hadoop/blob/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/nodelabels/NodeAttributesManagerImpl.java#L748
# This causes the ConcurrentModificationException
{code:java}
025-07-17 19:23:37,166 ERROR org.apache.hadoop.yarn.event.EventDispatcher
(SchedulerEventDispatcher:Event Processor): Error in handling event type
NODE_ADDED to the Event Dispatcher
java.util.ConcurrentModificationException
at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1597)
at java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1620)
at
java.base/java.util.AbstractCollection.toString(AbstractCollection.java:456)
at java.base/java.lang.String.valueOf(String.java:4220)
at java.base/java.lang.StringBuilder.append(StringBuilder.java:173)
at java.base/java.util.AbstractMap.toString(AbstractMap.java:555)
at java.base/java.lang.String.valueOf(String.java:4220)
at java.base/java.lang.StringBuilder.append(StringBuilder.java:173)
at
org.apache.hadoop.yarn.server.resourcemanager.nodelabels.NodeAttributesManagerImpl.refreshNodeAttributesToScheduler(NodeAttributesManagerImpl.java:748)
{code}
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