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https://issues.apache.org/jira/browse/ZOOKEEPER-895?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Koch resolved ZOOKEEPER-895.
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Resolution: Fixed
Has been solved as part of ZOOKEEPER-909 by using CopyOnWriteArraySet.
> ClientCnxn.authInfo must be thread safe
> ---------------------------------------
>
> Key: ZOOKEEPER-895
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-895
> Project: Zookeeper
> Issue Type: Bug
> Reporter: Thomas Koch
>
> authInfo can be accessed concurrently by different Threads, as exercised in
> org.apache.zookeeper.test.ACLTest
> The two concurrent access points in this case were (presumably):
> org.apache.zookeeper.ClientCnxn$SendThread.primeConnection(ClientCnxn.java:805)
> and
> org.apache.zookeeper.ClientCnxn.addAuthInfo(ClientCnxn.java:1121)
> The line numbers refer to the latest patch in ZOOKEEPER-823.
> The exception that pointed to this issue:
> [junit] 2010-10-13 09:35:55,113 [myid:] - WARN
> [main-SendThread(localhost:11221):clientcnxn$sendthr...@713] - Session 0x0
> for server localhost/127.0.0.1:11221, unexpected error, closing socket
> connection and attempting reconnect
> [junit] java.util.ConcurrentModificationException
> [junit] at
> java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
> [junit] at java.util.AbstractList$Itr.next(AbstractList.java:343)
> [junit] at
> org.apache.zookeeper.ClientCnxn$SendThread.primeConnection(ClientCnxn.java:805)
> [junit] at
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:247)
> [junit] at
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:694)
> Proposed solution: Use a thread save list for authInfo
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