devinbost commented on issue #6151: Producers stopped producing, intermittent 500's from Admin CLI and Zookeeper exceptions in broker logs URL: https://github.com/apache/pulsar/issues/6151#issuecomment-579354878 Here's an exception that appeared in the Bookeeper logs: ``` 14:10:06.330 [GarbageCollectorThread-11-1] ERROR org.apache.bookkeeper.bookie.ScanAndCompareGarbageCollector - Exception when iterating through the ledgers to check for over-replication org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists at org.apache.zookeeper.KeeperException.create(KeeperException.java:122) ~[org.apache.pulsar-pulsar-zookeeper-2.3.0.jar:2.3.0] at org.apache.bookkeeper.util.ZkUtils.createFullPathOptimistic(ZkUtils.java:186) ~[org.apache.bookkeeper-bookkeeper-server-4.9.0.jar:4.9.0] at org.apache.bookkeeper.meta.ZkLedgerUnderreplicationManager.acquireUnderreplicatedLedgerLock(ZkLedgerUnderreplicationManager.java:771) ~[org.apache.bookkeeper-bookkeeper-server-4.9.0.jar:4.9.0] at org.apache.bookkeeper.bookie.ScanAndCompareGarbageCollector.removeOverReplicatedledgers(ScanAndCompareGarbageCollector.java:215) [org.apache.bookkeeper-bookkeeper-server-4.9.0.jar:4.9.0] at org.apache.bookkeeper.bookie.ScanAndCompareGarbageCollector.gc(ScanAndCompareGarbageCollector.java:132) [org.apache.bookkeeper-bookkeeper-server-4.9.0.jar:4.9.0] at org.apache.bookkeeper.bookie.GarbageCollectorThread.doGcLedgers(GarbageCollectorThread.java:380) [org.apache.bookkeeper-bookkeeper-server-4.9.0.jar:4.9.0] at org.apache.bookkeeper.bookie.GarbageCollectorThread.runWithFlags(GarbageCollectorThread.java:331) [org.apache.bookkeeper-bookkeeper-server-4.9.0.jar:4.9.0] at org.apache.bookkeeper.bookie.GarbageCollectorThread.safeRun(GarbageCollectorThread.java:309) [org.apache.bookkeeper-bookkeeper-server-4.9.0.jar:4.9.0] at org.apache.bookkeeper.common.util.SafeRunnable.run(SafeRunnable.java:36) [org.apache.bookkeeper-bookkeeper-common-4.9.0.jar:4.9.0] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_181] at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [?:1.8.0_181] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_181] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [?:1.8.0_181] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_181] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_181] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [io.netty-netty-all-4.1.32.Final.jar:4.1.32.Final] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181] ```
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