[CASSANDRA-1028] NPE in AntiEntropyService.getNeighbors

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 0.7 beta 1
• Severity: Normal
• Assignee: Stu Hood
• Reporter: Jonathan Ellis

Authors

Stu Hood

• Created: 27/Apr/10 15:25
• Updated: 16/Apr/19 09:33
• Resolved: 23/Jul/10 18:03

Description

Sometimes, but not always, I see this during a test run:

[junit] Testsuite: org.apache.cassandra.service.AntiEntropyServiceTest
[junit] Tests run: 10, Failures: 0, Errors: 0, Time elapsed: 3.189 sec
[junit]
[junit] ------------- Standard Error -----------------
[junit] ERROR 10:19:09,743 Error in executor futuretask
[junit] java.util.concurrent.ExecutionException: java.lang.NullPointerException
[junit] at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
[junit] at java.util.concurrent.FutureTask.get(FutureTask.java:83)
[junit] at org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor.afterExecute(DebuggableThreadPoolExecutor.java:87)
[junit] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:888)
[junit] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
[junit] at java.lang.Thread.run(Thread.java:637)
[junit] Caused by: java.lang.NullPointerException
[junit] at java.util.AbstractCollection.addAll(AbstractCollection.java:303)
[junit] at org.apache.cassandra.service.AntiEntropyService.getNeighbors(AntiEntropyService.java:151)
[junit] at org.apache.cassandra.service.AntiEntropyService.rendezvous(AntiEntropyService.java:176)
[junit] at org.apache.cassandra.service.AntiEntropyService.access$100(AntiEntropyService.java:86)
[junit] at org.apache.cassandra.service.AntiEntropyService$Validator.call(AntiEntropyService.java:487)
[junit] at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
[junit] at java.util.concurrent.FutureTask.run(FutureTask.java:138)
[junit] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
[junit] ... 2 more
[junit] ------------- ---------------- ---------------

Ideally it would be nice if this could cause an actual test failure when it happens. Not sure how feasible that is.