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Posted to notifications@accumulo.apache.org by "Vikram Srivastava (JIRA)" <ji...@apache.org> on 2014/01/17 10:03:21 UTC
[jira] [Commented] (ACCUMULO-2154) NoNodeException error in master
[ https://issues.apache.org/jira/browse/ACCUMULO-2154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13874581#comment-13874581 ]
Vikram Srivastava commented on ACCUMULO-2154:
---------------------------------------------
I think it's happening because DeadServerList.getList first gets the list of paths using zoo.getChildren and then iterates over them without any lock to ensure any path doesn't get deleted while the loop is running.
> NoNodeException error in master
> -------------------------------
>
> Key: ACCUMULO-2154
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2154
> Project: Accumulo
> Issue Type: Bug
> Components: master
> Environment: 1.6.0 sha 417902e218c566333b6ea5ac492186ae305e5e16
> Reporter: John Vines
> Fix For: 1.6.0
>
>
> I have a test that brings accumulo down hard after a minute and then brings it back up again. I was running it overnight and I saw this stack trace once. Not sure if it's a problem or not though.
> {code}org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /accumulo/617ee3a7-98b9-4f5f-af13-8894afe7c33c/dead/tservers/10.10.1.148:9997
> org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /accumulo/617ee3a7-98b9-4f5f-af13-8894afe7c33c/dead/tservers/10.10.1.148:9997
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1151)
> at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1180)
> at org.apache.accumulo.fate.zookeeper.ZooReader.getData(ZooReader.java:45)
> at org.apache.accumulo.server.master.state.DeadServerList.getList(DeadServerList.java:52)
> at org.apache.accumulo.master.MasterClientServiceHandler.getMasterStats(MasterClientServiceHandler.java:268)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.accumulo.trace.instrument.thrift.TraceWrap$1.invoke(TraceWrap.java:63)
> at com.sun.proxy.$Proxy11.getMasterStats(Unknown Source)
> at org.apache.accumulo.core.master.thrift.MasterClientService$Processor$getMasterStats.getResult(MasterClientService.java:1414)
> at org.apache.accumulo.core.master.thrift.MasterClientService$Processor$getMasterStats.getResult(MasterClientService.java:1398)
> at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
> at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
> at org.apache.accumulo.server.util.TServerUtils$TimedProcessor.process(TServerUtils.java:171)
> at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:206)
> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
> at java.lang.Thread.run(Thread.java:662){code}
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