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From "Cameron McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CURATOR-228) A serious death cycle error(一个严重的死循环错误)
Date Wed, 12 Aug 2015 03:40:46 GMT

    [ https://issues.apache.org/jira/browse/CURATOR-228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14692864#comment-14692864
] 

Cameron McKenzie commented on CURATOR-228:
------------------------------------------

The argument from the guys on the dev list was that this breaks the contract of the persistent
ephemeral node, which is kind of true. Maybe we can just log an error for now to stop the
endless spamming of create requests to ZK for the NOAUTH case and think about a better fix
down the track?

> A serious death cycle error(一个严重的死循环错误)
> ---------------------------------------
>
>                 Key: CURATOR-228
>                 URL: https://issues.apache.org/jira/browse/CURATOR-228
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: Framework
>    Affects Versions: 2.7.0, 2.7.1, 2.8.0
>         Environment: windows linux mac ....
>            Reporter: coder_czp
>            Assignee: Cameron McKenzie
>
> 当用异步的方式创建带有多层目录的临时节点时,如果客户端没有zookeeper的写入权限,curator
就会陷入死循环,客户端会一直向服务器提交写入报文,但是永远不会成功。出错的代码逻辑如下:
> When used asynchronous way to create a temporary node multi directory, if the client
does not have the zookeeper write permissions, the curator will get into a cycle of death,
the client will has been submitted to the server write message, but never succeed. Error code
logic is as follows:
> 1  PersistentEphemeralNode sessionNode = new PersistentEphemeralNode(curatorClient, Mode.EPHEMERAL,"/a/b/c",
"test");
>    sessionNode.start();
>      CreateBuilderImpl:
>        forPath(xx)-->pathInBackground(xx)-->
> 		    CuratorFrameworkImpl:processBackgroundOperation(operationAndData, null);
> 				                    --->performBackgroundOperation(xx)
> 				OperationAndData:callPerformBackgroundOperation(xx)-->
>                          CreateBuilderImpl:performBackgroundOperation(xx)->backgroundCreateParentsThenNode(xx)
>                                              -->queueOperation(xx){backgroundOperations.offer(operationAndData);}

>                                
>   //这个循环会触发1,导致循环无法退出
>   //This cycle will trigger 1, causing the loop to exit.  
>   //CuratorFrameworkImpl
>  2 private void backgroundOperationsLoop()
>     {
>         while ( !Thread.currentThread().isInterrupted() )
>         {
>             OperationAndData<?> operationAndData;
>             try
>             {
>                 operationAndData = backgroundOperations.take();
>                 if ( debugListener != null )
>                 {
>                     debugListener.listen(operationAndData);
>                 }
>             }
>             catch ( InterruptedException e )
>             {
>                 Thread.currentThread().interrupt();
>                 break;
>             }
>             performBackgroundOperation(operationAndData);
>         }
>     }	
>  如果需要更多细节,请给我发邮件: coder_czp@126.com	
>  If you need more details, please email me:coder_czp@126.com



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