lhotari opened a new issue #11433:
URL: https://github.com/apache/pulsar/issues/11433
**Describe the bug**
Flaky test RackawareTest.testPlacement has been moved to quarantine test
group so that it doesn't block CI, this change was made in #11370.
The root cause seems to be a production code issue. The stacktrace shown in
the logs of a failing test hints that there might be a dead lock that happens.
One common issue is locking up Zookeeper threads when Zookeeper operations are
initiated from a zookeeper thread that notifies about a change.
```
12:15:18.019 [ForkJoinPool.commonPool-worker-1] WARN
org.apache.pulsar.zookeeper.ZooKeeperDataCache - Reloading ZooKeeperDataCache
failed at path: /bookies
java.util.concurrent.CompletionException: java.lang.RuntimeException:
java.util.concurrent.TimeoutException
at
java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314)
~[?:?]
at
java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319)
~[?:?]
at
java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:718)
~[?:?]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506)
~[?:?]
at
java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2073)
~[?:?]
at
org.apache.pulsar.zookeeper.ZooKeeperCache.lambda$getDataAsync$17(ZooKeeperCache.java:386)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:714)
~[?:?]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506)
~[?:?]
at
java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2073)
~[?:?]
at
org.apache.pulsar.zookeeper.ZooKeeperCache.lambda$getDataAsync$11(ZooKeeperCache.java:366)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1426)
[?:?]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) [?:?]
at
java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
[?:?]
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656) [?:?]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
[?:?]
at
java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)
[?:?]
Caused by: java.lang.RuntimeException: java.util.concurrent.TimeoutException
at
org.apache.pulsar.zookeeper.ZkBookieRackAffinityMapping.getRack(ZkBookieRackAffinityMapping.java:195)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
org.apache.pulsar.zookeeper.ZkBookieRackAffinityMapping.resolve(ZkBookieRackAffinityMapping.java:179)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy$DNSResolverDecorator.resolve(TopologyAwareEnsemblePlacementPolicy.java:561)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.bookkeeper.net.NetUtils.resolveNetworkLocation(NetUtils.java:88)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy.resolveNetworkLocation(TopologyAwareEnsemblePlacementPolicy.java:794)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy.createBookieNode(TopologyAwareEnsemblePlacementPolicy.java:784)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy.onBookieRackChange(TopologyAwareEnsemblePlacementPolicy.java:747)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.bookkeeper.client.RackawareEnsemblePlacementPolicyImpl.onBookieRackChange(RackawareEnsemblePlacementPolicyImpl.java:80)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.pulsar.zookeeper.ZkBookieRackAffinityMapping.onUpdate(ZkBookieRackAffinityMapping.java:242)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
org.apache.pulsar.zookeeper.ZkBookieRackAffinityMapping.onUpdate(ZkBookieRackAffinityMapping.java:53)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
org.apache.pulsar.zookeeper.ZooKeeperDataCache.lambda$reloadCache$3(ZooKeeperDataCache.java:138)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:714)
~[?:?]
... 13 more
Caused by: java.util.concurrent.TimeoutException
at
java.util.concurrent.CompletableFuture.timedGet(CompletableFuture.java:1886)
~[?:?]
at
java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2021) ~[?:?]
at
org.apache.pulsar.zookeeper.ZooKeeperDataCache.get(ZooKeeperDataCache.java:97)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
org.apache.pulsar.zookeeper.ZkBookieRackAffinityMapping.getRack(ZkBookieRackAffinityMapping.java:187)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
org.apache.pulsar.zookeeper.ZkBookieRackAffinityMapping.resolve(ZkBookieRackAffinityMapping.java:179)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy$DNSResolverDecorator.resolve(TopologyAwareEnsemblePlacementPolicy.java:561)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.bookkeeper.net.NetUtils.resolveNetworkLocation(NetUtils.java:88)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy.resolveNetworkLocation(TopologyAwareEnsemblePlacementPolicy.java:794)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy.createBookieNode(TopologyAwareEnsemblePlacementPolicy.java:784)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy.onBookieRackChange(TopologyAwareEnsemblePlacementPolicy.java:747)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.bookkeeper.client.RackawareEnsemblePlacementPolicyImpl.onBookieRackChange(RackawareEnsemblePlacementPolicyImpl.java:80)
~[bookkeeper-server-4.14.1.jar:4.14.1]
at
org.apache.pulsar.zookeeper.ZkBookieRackAffinityMapping.onUpdate(ZkBookieRackAffinityMapping.java:242)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
org.apache.pulsar.zookeeper.ZkBookieRackAffinityMapping.onUpdate(ZkBookieRackAffinityMapping.java:53)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
org.apache.pulsar.zookeeper.ZooKeeperDataCache.lambda$reloadCache$3(ZooKeeperDataCache.java:138)
~[pulsar-zookeeper-utils-2.9.0-SNAPSHOT.jar:2.9.0-SNAPSHOT]
at
java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:714)
~[?:?]
... 13 more
```
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