[YARN-8428] YARN service has ZooKeeper connection leaks

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Won't Fix
• Affects Version/s: 3.1.0
• Component/s: yarn-native-services
• Target Version/s: 3.2.0, 3.1.1
• Assignee: Eric Yang
• Reporter: Eric Yang
• Created: 14/Jun/18 20:06
• Updated: 15/Jun/18 21:19
• Resolved: 15/Jun/18 21:19

Description

There are two leaks discovered during stress test. First, YARN service application master uses RegistryDNS to create DNS record for YARN service. Data is first persisted on ZooKeeper, and RegistryDNS will lookup data in ZooKeeper to create DNS entries. YARN service AM does not close ZooKeeper connection after the record has been created. Second, when deleting DNS record from ZooKeeper, ZooKeeper connection is left open.