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Posted to dev@zookeeper.apache.org by "Arshad Mohammad (JIRA)" <ji...@apache.org> on 2016/01/18 15:59:40 UTC
[jira] [Commented] (ZOOKEEPER-2355) ZooKeeper ephemeral node is
never deleted if follower fail while reading the proposal packet
[ https://issues.apache.org/jira/browse/ZOOKEEPER-2355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15105390#comment-15105390 ]
Arshad Mohammad commented on ZOOKEEPER-2355:
--------------------------------------------
At step 6, while creating the ephemeral node /e1 following error is observed at faulted node B but after adjusting the parent c version it continues and user does not get any error
{code}
2016-01-18 20:17:47,928 [myid:3] - DEBUG [CommitProcWorkThread-1:DataTree@961] - Failed: 72279218071011328,5,8589934597,1453128465886,1
:'/e1,,v{s{31,s{'world,'anyone}}},T,2
org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists
at org.apache.zookeeper.server.DataTree.createNode(DataTree.java:514)
at org.apache.zookeeper.server.DataTree.processTxn(DataTree.java:827)
at org.apache.zookeeper.server.ZKDatabase.processTxn(ZKDatabase.java:401)
at org.apache.zookeeper.server.ZooKeeperServer.processTxn(ZooKeeperServer.java:1216)
at org.apache.zookeeper.server.ZooKeeperServer.processTxn(ZooKeeperServer.java:1207)
at org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:109)
at org.apache.zookeeper.server.quorum.CommitProcessor$CommitWorkRequest.doWork(CommitProcessor.java:296)
at org.apache.zookeeper.server.WorkerService$ScheduledWorkRequest.run(WorkerService.java:162)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
2016-01-18 20:17:50,378 [myid:3] - DEBUG [CommitProcWorkThread-1:DataTree@1003] - Adjusting parent cversion for Txn: 1 path:/e1 err: -110
{code}
> ZooKeeper ephemeral node is never deleted if follower fail while reading the proposal packet
> --------------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2355
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2355
> Project: ZooKeeper
> Issue Type: Bug
> Components: quorum, server
> Reporter: Arshad Mohammad
> Assignee: Arshad Mohammad
> Priority: Critical
>
> ZooKeeper ephemeral node is never deleted if follower fail while reading the proposal packet
> The scenario is as follows:
> # Configure three node ZooKeeper cluster, lets say nodes are A, B and C, start all, assume A is leader, B and C are follower
> # Connect to any of the server and create ephemeral node /e1
> # Close the session, ephemeral node /e1 will go for deletion
> # While receiving delete proposal make Follower B to fail with {{SocketTimeoutException}}. This we need to do to reproduce the scenario otherwise in production environment it happens because of network fault.
> # Remove the fault, just check that faulted Follower is now connected with quorum
> # Connect to any of the server, create the same ephemeral node /e1, created is success.
> # Close the session, ephemeral node /e1 will go for deletion
> # {color:red}/e1 is not deleted from the faulted Follower B, It should have been deleted as it was again created with another session{color}
> # {color:green}/e1 is deleted from Leader A and other Follower C{color}
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