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From "clive du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CURATOR-325) Background retry falls into infinite loop of SessionExpiredException
Date Mon, 23 May 2016 01:36:12 GMT

    [ https://issues.apache.org/jira/browse/CURATOR-325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295824#comment-15295824
] 

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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