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https://issues.apache.org/jira/browse/CURATOR-415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17751463#comment-17751463
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Kezhu Wang commented on CURATOR-415:
------------------------------------
Curator uses {{RetryPolicy}} to retry client operations. If you get
{{SessionExpiredException}}, that means either {{SessionExpiredException}} is
not allowed or the all retry permits are exhausted.
> 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
> Priority: Major
>
> 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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