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https://issues.apache.org/jira/browse/CURATOR-325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295824#comment-15295824
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clive du commented on CURATOR-325:
----------------------------------
at first hand, I think I should describe the use case, I use NodeCache provided
by recipe, and handle node change event in the thread curator do the background
operation. secondly, long gc pause shouldn't happen in normal case,but do in
extreme case, I simulate this case in debug mode, I toggle a break point on
onNodeChanged implement code, and pause for a long time, when I step over ,I
see the stacktrace periodically
> Background retry falls into infinite loop of SessionExpiredException
> --------------------------------------------------------------------
>
> Key: CURATOR-325
> URL: https://issues.apache.org/jira/browse/CURATOR-325
> Project: Apache Curator
> Issue Type: Bug
> Components: Client
> Affects Versions: 2.9.1, 2.10.0
> Environment: sun java jdk 1.7.0_55, curator 2.9.1, zookeeper 3.4.6
> Reporter: clive du
> Labels: SessionExpiredException, loop
>
> after long time gc pause,which longer than zookeeper session time,the
> zookeeper cluster invalidate the session id holding by the client and waiting
> the client to reconnect,but client consider the SessionExpiredException as
> retry exception and re-put to the background queue,so wo get the stacktrace
> infinitely.
> 12:50:54.337 [configuration-0-EventThread] DEBUG org.apache.curator.RetryLoop
> - Retrying operation
> 12:50:54.337 [configuration-0-EventThread] DEBUG org.apache.curator.RetryLoop
> - Retry-able exception received
> org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode
> = Session expired for /dynamic/apps/258741001/DEV
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:127)
> ~[zookeeper-3.4.6.jar:3.4.6-1569965]
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> ~[zookeeper-3.4.6.jar:3.4.6-1569965]
> at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1155)
> ~[zookeeper-3.4.6.jar:3.4.6-1569965]
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:304)
> ~[curator-framework-2.10.0.jar:na]
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:293)
> ~[curator-framework-2.10.0.jar:na]
> at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:108)
> ~[curator-client-2.10.0.jar:na]
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl.pathInForeground(GetDataBuilderImpl.java:290)
> [curator-framework-2.10.0.jar:na]
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:281)
> [curator-framework-2.10.0.jar:na]
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl$1.forPath(GetDataBuilderImpl.java:105)
> [curator-framework-2.10.0.jar:na]
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl$1.forPath(GetDataBuilderImpl.java:65)
> [curator-framework-2.10.0.jar:na]
> at
> com.ctrip.flight.configuration.client.AbstractZookeeperClient.getData(AbstractZookeeperClient.java:68)
> [classes/:na]
> at
> com.ctrip.flight.configuration.client.ZooKeeperConfigurationSource.getPublishNodeValue(ZooKeeperConfigurationSource.java:258)
> [classes/:na]
> at
> com.ctrip.flight.configuration.client.ZooKeeperConfigurationSource.access$100(ZooKeeperConfigurationSource.java:45)
> [classes/:na]
> at
> com.ctrip.flight.configuration.client.ZooKeeperConfigurationSource$1.nodeChanged(ZooKeeperConfigurationSource.java:105)
> [classes/:na]
> at
> org.apache.curator.framework.recipes.cache.NodeCache$4.apply(NodeCache.java:310)
> [curator-recipes-2.10.0.jar:na]
> at
> org.apache.curator.framework.recipes.cache.NodeCache$4.apply(NodeCache.java:304)
> [curator-recipes-2.10.0.jar:na]
> at
> org.apache.curator.framework.listen.ListenerContainer$1.run(ListenerContainer.java:93)
> [curator-framework-2.10.0.jar:na]
> at
> com.google.common.util.concurrent.MoreExecutors$DirectExecutorService.execute(MoreExecutors.java:310)
> [guava-19.0.jar:na]
> at
> org.apache.curator.framework.listen.ListenerContainer.forEach(ListenerContainer.java:85)
> [curator-framework-2.10.0.jar:na]
> at
> org.apache.curator.framework.recipes.cache.NodeCache.setNewData(NodeCache.java:302)
> [curator-recipes-2.10.0.jar:na]
> at
> org.apache.curator.framework.recipes.cache.NodeCache.processBackgroundResult(NodeCache.java:269)
> [curator-recipes-2.10.0.jar:na]
> at
> org.apache.curator.framework.recipes.cache.NodeCache.access$300(NodeCache.java:56)
> [curator-recipes-2.10.0.jar:na]
> at
> org.apache.curator.framework.recipes.cache.NodeCache$3.processResult(NodeCache.java:122)
> [curator-recipes-2.10.0.jar:na]
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:749)
> [curator-framework-2.10.0.jar:na]
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:522)
> [curator-framework-2.10.0.jar:na]
> at
> org.apache.curator.framework.imps.GetDataBuilderImpl$3.processResult(GetDataBuilderImpl.java:256)
> [curator-framework-2.10.0.jar:na]
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:561)
> [zookeeper-3.4.6.jar:3.4.6-1569965]
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
> [zookeeper-3.4.6.jar:3.4.6-1569965]
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