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From "Jordan Zimmerman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CURATOR-325) Background retry falls into infinite loop of SessionExpiredException
Date Sat, 21 May 2016 17:47:12 GMT

    [ https://issues.apache.org/jira/browse/CURATOR-325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295154#comment-15295154
] 

Jordan Zimmerman commented on CURATOR-325:
------------------------------------------

Can you provide a test case that shows the problem. Session expiration _should_ be a retry.
Internally, Curator will recreate the ZooKeeper handle when the session expires so I don't
see why this is a problem.

> 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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