Sergey Shelukhin created CURATOR-415:
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Summary: 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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