[CURATOR-103] NPE in PathChildrenCache

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.4.2
• Component/s: Recipes
• Assignee: Jordan Zimmerman
• Reporter: Jae Hyeon Bae
• Created: 12/Apr/14 18:51
• Updated: 12/Apr/14 20:55
• Resolved: 12/Apr/14 20:55

Description

On ConnectionLoss, PathChildrenCache cannot recover the connection with the following NPE

ERROR 2014-04-09 17:48:15,231 [DaemonThreadFactory-2-thread-2] org.apache.curator.framework.imps.CuratorFrameworkImpl: Background retry gave up
org.apache.curator.CuratorConnectionLossException: KeeperErrorCode = ConnectionLoss
at org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:766)
at org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(CuratorFrameworkImpl.java:749)
at org.apache.curator.framework.imps.CuratorFrameworkImpl.access$300(CuratorFrameworkImpl.java:56)
at org.apache.curator.framework.imps.CuratorFrameworkImpl$3.call(CuratorFrameworkImpl.java:244)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)

INFO 2014-04-09 17:48:15,276 [ServerInventoryView-0-EventThread] org.apache.curator.framework.state.ConnectionStateManager: State change: RECONNECTED
INFO 2014-04-09 17:48:15,382 [ServerInventoryView-0-EventThread] org.apache.curator.framework.state.ConnectionStateManager: State change: SUSPENDED
ERROR 2014-04-09 17:48:15,748 [DaemonThreadFactory-2-thread-2] org.apache.curator.framework.imps.CuratorFrameworkImpl: Background exception was not retry-able or retry gave up
java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:191)
at com.google.common.collect.Lists$TransformingSequentialList.<init>(Lists.java:527)
at com.google.common.collect.Lists.transform(Lists.java:510)
at org.apache.curator.framework.recipes.cache.PathChildrenCache.processChildren(PathChildrenCache.java:635)
at org.apache.curator.framework.recipes.cache.PathChildrenCache.access$200(PathChildrenCache.java:68)
at org.apache.curator.framework.recipes.cache.PathChildrenCache$4.processResult(PathChildrenCache.java:476)
at org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:686)
at org.apache.curator.framework.imps.CuratorFrameworkImpl.checkBackgroundRetry(CuratorFrameworkImpl.java:659)
at org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:783)
at org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(CuratorFrameworkImpl.java:749)
at org.apache.curator.framework.imps.CuratorFrameworkImpl.access$300(CuratorFrameworkImpl.java:56)
at org.apache.curator.framework.imps.CuratorFrameworkImpl$3.call(CuratorFrameworkImpl.java:244)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)