[CURATOR-649] Background exception was not retry-able or retry gave up

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 5.2.0
• Fix Version/s: 5.4.0
• Component/s: Client
• Assignee: Zili Chen
• Reporter: Sergey Nuyanzin
• Created: 16/Aug/22 10:00
• Updated: 30/Aug/22 05:43
• Resolved: 30/Aug/22 05:43

Description

This is is probably a kind of reopen of CURATOR-538
the case is we have 3 flink-nodes which under the hood using curator.
Then just add one node and remove another one.
After that some nodes start having NPE.

java.lang.NullPointerException: null
at org.apache.curator.utils.Compatibility.getHostAddress(Compatibility.java:116) 
at org.apache.curator.framework.imps.EnsembleTracker.configToConnectionString(EnsembleTracker.java:185)
at org.apache.curator.framework.imps.EnsembleTracker.processConfigData(EnsembleTracker.java:206) 
at org.apache.curator.framework.imps.EnsembleTracker.access$300(EnsembleTracker.java:50)
at org.apache.curator.framework.imps.EnsembleTracker$2.processResult(EnsembleTracker.java:150)
at org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:926) 
at org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:683)
at org.apache.curator.framework.imps.WatcherRemovalFacade.processBackgroundOperation(WatcherRemovalFacade.java:152)
at org.apache.curator.framework.imps.GetConfigBuilderImpl$2.processResult(GetConfigBuilderImpl.java:222)
at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:598)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510) 

We've got same issue and trace is very close it fails with NPE trying get Address
the only difference is that it is trying to get Address at org.apache.curator.utils.Compatibility#getHostAddress
at line

return (address != null) ? address.getAddress().getHostAddress() : "unknown";

We do not use telepresence mentioned in comments

Issue Links

• duplicates: FLINK-28947 Curator framework fails with NullPointerException
• is related to: CURATOR-538 Background exception was not retry-able or retry gave up
• is related to: CURATOR-597 Background exception was not retry-able or retry gave up