michaeljmarshall opened a new issue, #16455:
URL: https://github.com/apache/pulsar/issues/16455
**Describe the bug**
When starting several bookies, I ran into this error:
```
2022-06-27T16:15:06,204+0000 [main] ERROR org.apache.bookkeeper.server.Main
- Failed to build bookie server
java.util.concurrent.CompletionException:
org.apache.pulsar.metadata.api.MetadataStoreException$BadVersionException:
org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode =
BadVersion for /ledgers/underreplication/LAYOUT
at
java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:331)
~[?:?]
at
java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:346)
~[?:?]
at
java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:632)
~[?:?]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506)
~[?:?]
at
java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2088)
~[?:?]
at
org.apache.pulsar.metadata.impl.ZKMetadataStore.handlePutResult(ZKMetadataStore.java:210)
~[com.datastax.oss-pulsar-metadata-2.10.0.6.jar:2.10.0.6]
```
Note that the error is in the
`org.apache.pulsar.metadata.impl.ZKMetadataStore` class. After hitting the
error, the bookie exited. I'm not sure what would have cause this issue, but it
seems like a concurrent modification issue.
**Expected behavior**
The bookie should not fail to start without retrying first.
**Additional context**
This is on the DataStax build of pulsar 2.10. plus some commits. In looking
at the code in ZKMetadataStore, there are no relevant differences.
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