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https://issues.apache.org/jira/browse/ACCUMULO-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Josh Elser resolved ACCUMULO-3831.
----------------------------------
Resolution: Fixed
> Race condition in automatic kerberos user creation can result in error message
> ------------------------------------------------------------------------------
>
> Key: ACCUMULO-3831
> URL: https://issues.apache.org/jira/browse/ACCUMULO-3831
> Project: Accumulo
> Issue Type: Bug
> Components: tserver
> Environment: Kerberos
> Reporter: Josh Elser
> Assignee: Josh Elser
> Fix For: 1.7.1, 1.8.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> {noformat}
> User already exists in ZooKeeper
> org.apache.zookeeper.KeeperException$NodeExistsException:
> KeeperErrorCode = NodeExists for
> /accumulo/cdb82c8b-3519-4139-843f-3c0aadc6ba01/users/aHJ0XzU=
> at
> org.apache.zookeeper.KeeperException.create(KeeperException.java:119)
> at
> org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783)
> at
> org.apache.accumulo.fate.zookeeper.ZooUtil.putData(ZooUtil.java:288)
> at
> org.apache.accumulo.fate.zookeeper.ZooUtil.putPrivatePersistentData(ZooUtil.java:420)
> at
> org.apache.accumulo.fate.zookeeper.ZooReaderWriter.putPrivatePersistentData(ZooReaderWriter.java:79)
> at
> org.apache.accumulo.server.security.handler.KerberosAuthenticator.createUserNodeInZk(KerberosAuthenticator.java:87)
> at
> org.apache.accumulo.server.security.handler.KerberosAuthenticator.createUser(KerberosAuthenticator.java:158)
> at
> org.apache.accumulo.server.security.SecurityOperation._createUser(SecurityOperation.java:627)
> at
> org.apache.accumulo.server.security.SecurityOperation.createUser(SecurityOperation.java:614)
> at
> org.apache.accumulo.server.security.AuditedSecurityOperation.createUser(AuditedSecurityOperation.java:228)
> at
> org.apache.accumulo.server.client.ClientServiceHandler.createLocalUser(ClientServiceHandler.java:178)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.apache.accumulo.core.trace.wrappers.RpcServerInvocationHandler.invoke(RpcServerInvocationHandler.java:46)
> at
> org.apache.accumulo.server.rpc.RpcWrapper$1.invoke(RpcWrapper.java:47)
> at com.sun.proxy.$Proxy20.createLocalUser(Unknown Source)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.apache.accumulo.server.rpc.TCredentialsUpdatingInvocationHandler.invokeMethod(TCredentialsUpdatingInvocationHandler.java:154)
> at
> org.apache.accumulo.server.rpc.TCredentialsUpdatingInvocationHandler.invoke(TCredentialsUpdatingInvocationHandler.java:58)
> at com.sun.proxy.$Proxy20.createLocalUser(Unknown Source)
> at
> org.apache.accumulo.core.client.impl.thrift.ClientService$Processor$createLocalUser.getResult(ClientService.java:2469)
> at
> org.apache.accumulo.core.client.impl.thrift.ClientService$Processor$createLocalUser.getResult(ClientService.java:2453)
> at
> org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
> at
> org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
> at
> org.apache.accumulo.server.rpc.UGIAssumingProcessor.process(UGIAssumingProcessor.java:102)
> at
> org.apache.accumulo.server.rpc.TimedProcessor.process(TimedProcessor.java:63)
> at
> org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:225)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> Saw this in the monitor. A couple of concerns
> * The same user coming in twice in parallel could result in two servers
> hitting the same codepath for the same user. This is expected (don't create
> an error message).
> * Need to make sure that the above case doesn't result in one user seeing an
> error.
> The above stacktrace can only happen when a user first accesses the system.
> After that, it's just existence checks on ZK which are idempotent.
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