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  1. Bookkeeper
  2. BOOKKEEPER-890

Concurrent modification exception when removing listener in Bookkeeper ZK ledger manager

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: 4.3.2
    • Fix Version/s: 4.4.0
    • Component/s: None
    • Labels:
      None

      Description

      The listener set is modified while iterating through it.

      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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            • Assignee:
              mmerli Matteo Merli
              Reporter:
              mmerli Matteo Merli
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              • Created:
                Updated:
                Resolved: