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Posted to issues@zookeeper.apache.org by "maoling (Jira)" <ji...@apache.org> on 2020/11/05 06:09:00 UTC
[jira] [Updated] (ZOOKEEPER-3986) ConcurrentModificationException
in PrepRequestProcessor.checkACL when iterating and add authInfo List
concurrently
[ https://issues.apache.org/jira/browse/ZOOKEEPER-3986?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
maoling updated ZOOKEEPER-3986:
-------------------------------
Summary: ConcurrentModificationException in PrepRequestProcessor.checkACL when iterating and add authInfo List concurrently (was: ConcurrentModificationException in PrepRequestProcessor.checkACL)
> ConcurrentModificationException in PrepRequestProcessor.checkACL when iterating and add authInfo List concurrently
> ------------------------------------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-3986
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3986
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.5.0
> Reporter: Jonathan Halterman
> Priority: Major
>
> We have some Zookeeper clusters under pretty heavy load that are occasionally throwing ConcurrentModificationException during ACL checking:
> {noformat}
>
> ERROR [CommitProcWorkThread-17:FinalRequestProcessor@439] - Failed to process sessionid:0xa006cd06b181510 type:getChildren2 cxid:0x4dae zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a
> java.util.ConcurrentModificationException
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
> at java.util.ArrayList$Itr.next(ArrayList.java:859)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1044)
> at org.apache.zookeeper.server.PrepRequestProcessor.checkACL(PrepRequestProcessor.java:321)
> at org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:383)
> at org.apache.zookeeper.server.quorum.CommitProcessor$CommitWorkRequest.doWork(CommitProcessor.java:297)
> at org.apache.zookeeper.server.WorkerService$ScheduledWorkRequest.run(WorkerService.java:162)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {noformat}
> This appears to be caused by auths changing while we're processing a request, such as here:
> [https://github.com/apache/zookeeper/blob/branch-3.5/zookeeper-server/src/main/java/org/apache/zookeeper/server/ServerCnxn.java#L101-L110]
> The result of this appears to be that occasionally requests fail unexpectedly.
>
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