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https://issues.apache.org/jira/browse/HADOOP-17368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HADOOP-17368 started by Ahmed Hussein.
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> Zookeeper secret manager attempts to reuse token sequence numbers
> -----------------------------------------------------------------
>
> Key: HADOOP-17368
> URL: https://issues.apache.org/jira/browse/HADOOP-17368
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Reporter: Ahmed Hussein
> Assignee: Ahmed Hussein
> Priority: Major
>
> [~daryn] reported that the ZK delegation token secret manager uses a
> {{SharedCounter}} to synchronize increments of a monotonically increasing
> sequence number for new tokens. Yet the KMS logs occasionally, depending on
> load, contains an odd error indicating collisions:
> {code:bash}
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
> NodeExists for /zkdtsm/ZKDTSMRoot/ZKDTSMTokensRoot/DT_137547444
> {code}
> ZKDTSM does a CAS get and set of the sequence number. Rather than return the
> value it set, it returns the current value which may have already been
> incremented by another KMS.
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