rdhabalia opened a new pull request #5604: [pulsar-broker] recover zk-badversion while updating cursor metadata URL: https://github.com/apache/pulsar/pull/5604 ### Motivation Due to bugs while unloading topic, we have seen that current owner-broker of topic sees below exception while updating cursor metadata. because of that cursor metadata doesn't updated into zk and broker restart builds huge backlog. ``` 01:02:30.993 [bookkeeper-ml-workers-OrderedExecutor-3-0] WARN org.apache.bookkeeper.mledger.impl.ManagedCursorImpl - [prop/cluster/ns/persistent/topic-partit ion-53] Failed to update consumer sub1 org.apache.bookkeeper.mledger.ManagedLedgerException$BadVersionException: org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode = BadVersion Caused by: org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode = BadVersion at org.apache.zookeeper.KeeperException.create(KeeperException.java:118) ~[zookeeper-3.4.13.jar:3.4.13-2d71af4dbe22557fda74f9a9b4309b15a7487f03] at org.apache.bookkeeper.mledger.impl.MetaStoreImplZookeeper.lambda$null$125(MetaStoreImplZookeeper.java:288) ~[managed-ledger-original-2.4.5-yahoo.jar:2.4.5-yahoo] at org.apache.bookkeeper.mledger.util.SafeRun$1.safeRun(SafeRun.java:32) [managed-ledger-original-2.4.5-yahoo.jar:2.4.5-yahoo] at org.apache.bookkeeper.common.util.SafeRunnable.run(SafeRunnable.java:36) [bookkeeper-common-4.9.0.jar:4.9.0] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [netty-all-4.1.32.Final.jar:4.1.32.Final] at java.lang.Thread.run(Thread.java:834) [?:?] ``` In this case, broker-ml should have capability to recover from `BadVersionException` error by checking ownership of managed-ledger and refreshing the version. ### Modification ML checks ownership and refresh metadata's zk-version to recover from `BadVersionException`.
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