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https://issues.apache.org/jira/browse/KAFKA-3783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ismael Juma resolved KAFKA-3783.
--------------------------------
Resolution: Fixed
> Race condition on last ACL removal for a resource fails with a
> ZkBadVersionException
> ------------------------------------------------------------------------------------
>
> Key: KAFKA-3783
> URL: https://issues.apache.org/jira/browse/KAFKA-3783
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.9.0.1, 0.10.0.0
> Reporter: Sébastien Launay
> Assignee: Sébastien Launay
> Priority: Minor
> Fix For: 0.10.0.1
>
>
> When removing the last ACL for a given resource, the znode storing the ACLs
> will get removed.
> The version number of the znode is used for optimistic locking in a loop to
> provide atomic changes across brokers.
> Unfortunately the exception thrown when the operation fails because of a
> different version number is the wrong one
> ({{KeeperException.BadVersionException}} instead of ZkClient
> {{ZkBadVersionException}}) and does not get caught resulting in the
> following stack trace:
> {noformat}
> org.I0Itec.zkclient.exception.ZkBadVersionException:
> org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode =
> BadVersion for /kafka-acl/Topic/e6df8028-f268-408c-814e-d418e943b2fa
> at org.I0Itec.zkclient.exception.ZkException.create(ZkException.java:51)
> at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:1000)
> at org.I0Itec.zkclient.ZkClient.delete(ZkClient.java:1047)
> at kafka.utils.ZkUtils.conditionalDeletePath(ZkUtils.scala:522)
> at
> kafka.security.auth.SimpleAclAuthorizer.kafka$security$auth$SimpleAclAuthorizer$$updateResourceAcls(SimpleAclAuthorizer.scala:282)
> at
> kafka.security.auth.SimpleAclAuthorizer$$anonfun$removeAcls$1.apply$mcZ$sp(SimpleAclAuthorizer.scala:187)
> at
> kafka.security.auth.SimpleAclAuthorizer$$anonfun$removeAcls$1.apply(SimpleAclAuthorizer.scala:187)
> at
> kafka.security.auth.SimpleAclAuthorizer$$anonfun$removeAcls$1.apply(SimpleAclAuthorizer.scala:187)
> at kafka.utils.CoreUtils$.inLock(CoreUtils.scala:231)
> at kafka.utils.CoreUtils$.inWriteLock(CoreUtils.scala:239)
> at
> kafka.security.auth.SimpleAclAuthorizer.removeAcls(SimpleAclAuthorizer.scala:186)
> ...
> Caused by: org.apache.zookeeper.KeeperException$BadVersionException:
> KeeperErrorCode = BadVersion for
> /kafka-acl/Topic/e6df8028-f268-408c-814e-d418e943b2fa
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:115)
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> at org.apache.zookeeper.ZooKeeper.delete(ZooKeeper.java:873)
> at org.I0Itec.zkclient.ZkConnection.delete(ZkConnection.java:109)
> at org.I0Itec.zkclient.ZkClient$11.call(ZkClient.java:1051)
> at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:990)
> ... 18 more
> {noformat}
> I noticed this behaviour while working on another fix when running the
> {{SimpleAclAuthorizerTest}} unit tests but this can happens when running
> simultaneously the {{kafka-acls.sh}} command on different brokers in rare
> cases.
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