Matteo Merli created BOOKKEEPER-890:
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Summary: Concurrent modification exception when removing listener
in Bookkeeper ZK ledger manager
Key: BOOKKEEPER-890
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-890
Project: Bookkeeper
Issue Type: Bug
Affects Versions: 4.3.2
Reporter: Matteo Merli
Assignee: Matteo Merli
Priority: Minor
Fix For: 4.4.0
The listener set is modified while iterating through it.
{noformat}
00:20:00.283 [main-EventThread] INFO o.a.b.meta.AbstractZkLedgerManager -
Unregistered ledger metadata listener ReadOnlyLedgerHandle(lid = 10454, id =
839729832) on ledger 10454.
00:20:00.283 [main-EventThread] ERROR org.apache.zookeeper.ClientCnxn -
Error while calling watcher
java.util.ConcurrentModificationException: null
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
~[na:1.8.0_60]
at java.util.HashMap$KeyIterator.next(HashMap.java:1453) ~[na:1.8.0_60]
at
org.apache.bookkeeper.meta.AbstractZkLedgerManager.process(AbstractZkLedgerManager.java:207)
~[bookkeeper-server-4.3.1.36.jar:4.3.1]
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:522)
[zookeeper-3.4.6.jar:3.4.6-1569965]
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
[zookeeper-3.4.6.jar:3.4.6-1569965]
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