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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11722) Some Instances of Services using ZKDelegationTokenSecretManager go down when old token cannot be deleted
Date Fri, 01 Feb 2019 21:38:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16758686#comment-16758686
] 

Arpit Agarwal commented on HADOOP-11722:
----------------------------------------

It looks like this was never actually committed to branch-2.7. 

> Some Instances of Services using ZKDelegationTokenSecretManager go down when old token
cannot be deleted
> --------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-11722
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11722
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Arun Suresh
>            Assignee: Arun Suresh
>            Priority: Major
>             Fix For: 2.7.0
>
>         Attachments: HADOOP-11722.1.patch, HADOOP-11722.2.patch
>
>
> The delete node code in {{ZKDelegationTokenSecretManager}} is as follows :
> {noformat}
>        while(zkClient.checkExists().forPath(nodeRemovePath) != null){
>           zkClient.delete().guaranteed().forPath(nodeRemovePath);
>        }
> {noformat}
> When instances of a Service using {{ZKDelegationTokenSecretManager}} try deleting a node
simutaneously, It is possible that all of them enter into the while loop in which case, all
peers will try to delete the node.. Only 1 will succeed and the rest will throw an exception..
which will bring down the node.
> The Exception is as follows :
> {noformat}
> 2015-03-15 10:24:54,000 ERROR org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager:
ExpiredTokenRemover thread received unexpected exception
> java.lang.RuntimeException: Could not remove Stored Token ZKDTSMDelegationToken_28
> 	at org.apache.hadoop.security.token.delegation.ZKDelegationTokenSecretManager.removeStoredToken(ZKDelegationTokenSecretManager.java:770)
> 	at org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager.removeExpiredToken(AbstractDelegationTokenSecretManager.java:605)
> 	at org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager.access$400(AbstractDelegationTokenSecretManager.java:54)
> 	at org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager$ExpiredTokenRemover.run(AbstractDelegationTokenSecretManager.java:656)
> 	at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode
for /zkdtsm/ZKDTSMRoot/ZKDTSMTokensRoot/DT_28
> 	at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
> 	at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> 	at org.apache.zookeeper.ZooKeeper.delete(ZooKeeper.java:873)
> 	at org.apache.curator.framework.imps.DeleteBuilderImpl$5.call(DeleteBuilderImpl.java:238)
> 	at org.apache.curator.framework.imps.DeleteBuilderImpl$5.call(DeleteBuilderImpl.java:233)
> 	at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107)
> 	at org.apache.curator.framework.imps.DeleteBuilderImpl.pathInForeground(DeleteBuilderImpl.java:230)
> 	at org.apache.curator.framework.imps.DeleteBuilderImpl.forPath(DeleteBuilderImpl.java:214)
> 	at org.apache.curator.framework.imps.DeleteBuilderImpl.forPath(DeleteBuilderImpl.java:41)
> 	at org.apache.hadoop.security.token.delegation.ZKDelegationTokenSecretManager.removeStoredToken(ZKDelegationTokenSecretManager.java:764)
> 	... 4 more
> {noformat}  



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