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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CURATOR-415) SharedValue doesn't retry on session expiration and the approach to retries is not clear
Date Mon, 22 May 2017 18:32:04 GMT

    [ https://issues.apache.org/jira/browse/CURATOR-415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16019978#comment-16019978
] 

Sergey Shelukhin commented on CURATOR-415:
------------------------------------------

cc [~enis]

> SharedValue doesn't retry on session expiration and the approach to retries is not clear
> ----------------------------------------------------------------------------------------
>
>                 Key: CURATOR-415
>                 URL: https://issues.apache.org/jira/browse/CURATOR-415
>             Project: Apache Curator
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Jordan Zimmerman
>
> When the session expires, seemingly on a background thread, trying to set a shared value
instantly fails (in our logs there's no delay between the previous activity of the calling
thread, and the exception). Judging by the code in RetryLoop that is the default behavior.
> Seems like there should be some mechanism to wait and/or retry. Also, in absence of such
mechanism it's not clear whether external retries should be used, or whether SharedValue object
is entirely unusable after session expiration (since if it were usable across sessions, one
would assume it would retry internally ;))
> {noformat}
> 2017-05-17T21:33:33,863 ERROR [b99e518c-9777-4c99-b5e7-c9a371aba3af HiveServer2-Handler-Pool:
Thread-36331-EventThread]: imps.CuratorFrameworkImpl (CuratorFrameworkImpl.java:logError(546))
- Watcher exception
> org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode = Session
expired for ...
> ...
> 2017-05-17T21:33:39,935 
> ... 
> Caused by: java.lang.RuntimeException: org.apache.zookeeper.KeeperException$SessionExpiredException:KeeperErrorCode
= Session expired for /zkdtsm_hive_llap0/ZKDTSMRoot/ZKDTSMSeqNumRoot
> 	at org.apache.zookeeper.KeeperException.create(KeeperException.java:127)
> 	at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> 	at org.apache.zookeeper.ZooKeeper.setData(ZooKeeper.java:1270)
> 	at org.apache.curator.framework.imps.SetDataBuilderImpl$4.call(SetDataBuilderImpl.java:274)
> 	at org.apache.curator.framework.imps.SetDataBuilderImpl$4.call(SetDataBuilderImpl.java:270)
> 	at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107)
> 	at org.apache.curator.framework.imps.SetDataBuilderImpl.pathInForeground(SetDataBuilderImpl.java:267)
> 	at org.apache.curator.framework.imps.SetDataBuilderImpl.forPath(SetDataBuilderImpl.java:253)
> 	at org.apache.curator.framework.imps.SetDataBuilderImpl.forPath(SetDataBuilderImpl.java:41)
> 	at org.apache.curator.framework.recipes.shared.SharedValue.trySetValue(SharedValue.java:168)
> 	at org.apache.curator.framework.recipes.shared.SharedCount.trySetCount(SharedCount.java:111)
> {noformat}



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