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Posted to notifications@dubbo.apache.org by GitBox <gi...@apache.org> on 2021/09/18 07:33:30 UTC
[GitHub] [dubbo] FinalVersion opened a new issue #8845: Consumer cannot get provider instance list updated using Zookeeper registry
FinalVersion opened a new issue #8845:
URL: https://github.com/apache/dubbo/issues/8845
- [*] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [*] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.
### Environment
* Dubbo version: 2.7.10
* Operating System version: CentOS 7
* Java version: 1.8.0
### Expected Result
Consumer using Zookeeper registry can get provider instance list updated whenever a provider instance is registered or deregistered.
### Actual Result
Provider instance list is never updated when first call to doSubscribe failed with an exception.
thread dump below shows that zookeeper event thread is forever waiting on a `CountDownLatch`.
```
"main-EventThread" #109 daemon prio=5 os_prio=0 tid=0x00007f5d67934800 nid=0x95 waiting on condition [0x00007f5b41c5e000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000005c73a9390> (a java.util.concurrent.CountDownLatch$Sync)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
at org.apache.dubbo.registry.zookeeper.ZookeeperRegistry$RegistryChildListenerImpl.childChanged(ZookeeperRegistry.java:338)
at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient$CuratorWatcherImpl.process(CuratorZookeeperClient.java:294)
at org.apache.curator.framework.imps.NamespaceWatcher.process(NamespaceWatcher.java:83)
at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:531)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:506)
```
The CountDownLatch is used in `ZookeeperRegistry#doSubscribe()`, which may not be `countDown` if an exception is thrown, like below
```
...
Caused by: org.apache.dubbo.rpc.RpcException: Failed to subscribe consumer://172.17.0.5/..., cause: null
at org.apache.dubbo.registry.zookeeper.ZookeeperRegistry.doSubscribe(ZookeeperRegistry.java:186) ~[dubbo-2.7.10.jar!/:2.7.10]
at org.apache.dubbo.registry.support.FailbackRegistry.subscribe(FailbackRegistry.java:299) ~[dubbo-2.7.10.jar!/:2.7.10]
... 33 more
Caused by: java.lang.IllegalStateException
at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.addTargetChildListener(CuratorZookeeperClient.java:215) ~[dubbo-2.7.10.jar!/:2.7.10]
at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.addTargetChildListener(CuratorZookeeperClient.java:53) ~[dubbo-2.7.10.jar!/:2.7.10]
at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperClient.addChildListener(AbstractZookeeperClient.java:112) ~[dubbo-2.7.10.jar!/:2.7.10]
at org.apache.dubbo.registry.zookeeper.ZookeeperRegistry.doSubscribe(ZookeeperRegistry.java:176) ~[dubbo-2.7.10.jar!/:2.7.10]
at org.apache.dubbo.registry.support.FailbackRegistry.subscribe(FailbackRegistry.java:299) ~[dubbo-2.7.10.jar!/:2.7.10]
... 33 more
Caused by: java.lang.InterruptedException
at java.lang.Object.wait(Native Method) ~[?:1.8.0_111]
at java.lang.Object.wait(Object.java:502) ~[?:1.8.0_111]
at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1409) ~[zookeeper-3.4.11.jar!/:3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0]
at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1651) ~[zookeeper-3.4.11.jar!/:3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0]
at org.apache.curator.framework.imps.GetChildrenBuilderImpl$3.call(GetChildrenBuilderImpl.java:242) ~[curator-framework-4.0.1.jar!/:4.0.1]
at org.apache.curator.framework.imps.GetChildrenBuilderImpl$3.call(GetChildrenBuilderImpl.java:231) ~[curator-framework-4.0.1.jar!/:4.0.1]
at org.apache.curator.connection.StandardConnectionHandlingPolicy.callWithRetry(StandardConnectionHandlingPolicy.java:64) ~[curator-client-4.0.1.jar!/:?]
at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:100) ~[curator-client-4.0.1.jar!/:?]
at org.apache.curator.framework.imps.GetChildrenBuilderImpl.pathInForeground(GetChildrenBuilderImpl.java:228) ~[curator-framework-4.0.1.jar!/:4.0.1]
at org.apache.curator.framework.imps.GetChildrenBuilderImpl.forPath(GetChildrenBuilderImpl.java:219) ~[curator-framework-4.0.1.jar!/:4.0.1]
at org.apache.curator.framework.imps.GetChildrenBuilderImpl.forPath(GetChildrenBuilderImpl.java:41) ~[curator-framework-4.0.1.jar!/:4.0.1]
at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.addTargetChildListener(CuratorZookeeperClient.java:211) ~[dubbo-2.7.10.jar!/:2.7.10]
at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.addTargetChildListener(CuratorZookeeperClient.java:53) ~[dubbo-2.7.10.jar!/:2.7.10]
at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperClient.addChildListener(AbstractZookeeperClient.java:112) ~[dubbo-2.7.10.jar!/:2.7.10]
at org.apache.dubbo.registry.zookeeper.ZookeeperRegistry.doSubscribe(ZookeeperRegistry.java:176) ~[dubbo-2.7.10.jar!/:2.7.10]
at org.apache.dubbo.registry.support.FailbackRegistry.subscribe(FailbackRegistry.java:299) ~[dubbo-2.7.10.jar!/:2.7.10]
... 33 more
```
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[GitHub] [dubbo] candyaaa commented on issue #8845: Consumer cannot get provider instance list updated using Zookeeper registry
Posted by GitBox <gi...@apache.org>.
candyaaa commented on issue #8845:
URL: https://github.com/apache/dubbo/issues/8845#issuecomment-922236562
@i will solve it@
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[GitHub] [dubbo] AlbumenJ closed issue #8845: Consumer cannot get provider instance list updated using Zookeeper registry
Posted by GitBox <gi...@apache.org>.
AlbumenJ closed issue #8845:
URL: https://github.com/apache/dubbo/issues/8845
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[GitHub] [dubbo] candyaaa commented on issue #8845: Consumer cannot get provider instance list updated using Zookeeper registry
Posted by GitBox <gi...@apache.org>.
candyaaa commented on issue #8845:
URL: https://github.com/apache/dubbo/issues/8845#issuecomment-923122441
CountDownLatch是要释放的，否则会有一条线程一直等待在org.apache.dubbo.registry.zookeeper.ZookeeperRegistry.RegistryChildListenerImpl#childChanged，至于提供者实例列表不更新，根据异常日志，我怀疑是网络原因导致，所以我先提交了释放CountDownLatch的逻辑。
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