[YARN-8740] Clear node attribute path after each test run

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.2.0
• Hadoop Flags: Reviewed
• Assignee: Bibin Chundatt
• Reporter: Bibin Chundatt
• Created: 02/Sep/18 13:09
• Updated: 12/Sep/18 11:38
• Resolved: 03/Sep/18 06:42

Description

During CI run we observed that testcases are failing due to old attribute store

Two updates are done as part of this jira

1. Skip sending scheduler event when update attributes map is empty
2. Clear Node attributes on testruns

CI logs

Caused by: java.lang.NullPointerException
	at org.apache.hadoop.yarn.server.resourcemanager.nodelabels.NodeAttributesManagerImpl.internalUpdateAttributesOnNodes(NodeAttributesManagerImpl.java:223)
	at org.apache.hadoop.yarn.server.resourcemanager.nodelabels.NodeAttributesManagerImpl.processMapping(NodeAttributesManagerImpl.java:703)
	at org.apache.hadoop.yarn.server.resourcemanager.nodelabels.NodeAttributesManagerImpl.replaceNodeAttributes(NodeAttributesManagerImpl.java:671)
	at org.apache.hadoop.yarn.nodelabels.store.op.NodeAttributeMirrorOp.recover(NodeAttributeMirrorOp.java:56)
	at org.apache.hadoop.yarn.nodelabels.store.op.NodeAttributeMirrorOp.recover(NodeAttributeMirrorOp.java:35)