[STORM-3379] Intermittent NPE during worker boot in local mode

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.1.0
• Component/s: storm-client
• Labels: pull-request-available
• Assignee: Stig Rohde Døssing
• Reporter: Stig Rohde Døssing
• Created: 13/Apr/19 08:58
• Updated: 10/Aug/19 22:24
• Resolved: 05/May/19 14:14

Description

java.io.IOException: java.lang.NullPointerException
at org.apache.storm.daemon.supervisor.LocalContainer.launch(LocalContainer.java:57) ~[storm-server-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
at org.apache.storm.daemon.supervisor.LocalContainerLauncher.launchContainer(LocalContainerLauncher.java:49) ~[storm-server-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
at org.apache.storm.daemon.supervisor.Slot.handleWaitingForBlobUpdate(Slot.java:536) ~[storm-server-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
at org.apache.storm.daemon.supervisor.Slot.stateMachineStep(Slot.java:230) ~[storm-server-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
at org.apache.storm.daemon.supervisor.Slot.run(Slot.java:931) [storm-server-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
Caused by: java.lang.NullPointerException
at org.apache.storm.daemon.worker.WorkerState.readWorkerExecutors(WorkerState.java:623) ~[storm-client-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
at org.apache.storm.daemon.worker.WorkerState.<init>(WorkerState.java:156) ~[storm-client-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
at org.apache.storm.daemon.worker.Worker.loadWorker(Worker.java:174) ~[storm-client-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
at org.apache.storm.daemon.worker.Worker.lambda$start$0(Worker.java:166) ~[storm-client-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_201]
at javax.security.auth.Subject.doAs(Subject.java:422) ~[?:1.8.0_201]
at org.apache.storm.daemon.worker.Worker.start(Worker.java:165) ~[storm-client-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
at org.apache.storm.daemon.supervisor.LocalContainer.launch(LocalContainer.java:55) ~[storm-server-2.0.1-SNAPSHOT.jar:2.0.1-SNAPSHOT]
... 4 more

The issue is that the WorkerState tries to read executor assignment from ZK, and gets null back.

Issue Links

• links to: GitHub Pull Request #2998