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https://issues.apache.org/jira/browse/FLINK-25981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17488112#comment-17488112
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Matthias Pohl commented on FLINK-25981:
---------------------------------------
I was able to reproduce locally after 853 test runs...
> ZooKeeperMultipleComponentLeaderElectionDriverTest failed
> ---------------------------------------------------------
>
> Key: FLINK-25981
> URL: https://issues.apache.org/jira/browse/FLINK-25981
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination
> Affects Versions: 1.15.0
> Reporter: Matthias Pohl
> Priority: Major
> Labels: test-stability
>
> We experienced a [build
> failure|https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=30783&view=logs&j=a57e0635-3fad-5b08-57c7-a4142d7d6fa9&t=2ef0effc-1da1-50e5-c2bd-aab434b1c5b7&l=15997]
> in
> {{ZooKeeperMultipleComponentLeaderElectionDriverTest.testLeaderElectionWithMultipleDrivers}}.
> The test halted when waiting for the next leader in
> [ZooKeeperMultipleComponentLeaderElectionDriverTest:256|https://github.com/apache/flink/blob/e8742f7f5cac34852d0e621036e1614bbdfe8ec3/flink-runtime/src/test/java/org/apache/flink/runtime/leaderelection/ZooKeeperMultipleComponentLeaderElectionDriverTest.java#L256]
> {code}
> Feb 04 18:02:54 "main" #1 prio=5 os_prio=0 tid=0x00007fab0800b800 nid=0xe07
> waiting on condition [0x00007fab12574000]
> Feb 04 18:02:54 java.lang.Thread.State: WAITING (parking)
> Feb 04 18:02:54 at sun.misc.Unsafe.park(Native Method)
> Feb 04 18:02:54 - parking to wait for <0x000000008065c5c8> (a
> java.util.concurrent.CompletableFuture$Signaller)
> Feb 04 18:02:54 at
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> Feb 04 18:02:54 at
> java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1707)
> Feb 04 18:02:54 at
> java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3323)
> Feb 04 18:02:54 at
> java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1742)
> Feb 04 18:02:54 at
> java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1947)
> Feb 04 18:02:54 at
> org.apache.flink.runtime.leaderelection.ZooKeeperMultipleComponentLeaderElectionDriverTest.testLeaderElectionWithMultipleDrivers(ZooKeeperMultipleComponentLeaderElectionDriverTest.java:256)
> [...]
> {code}
> The extended Maven logs don't show anything suspicious:
> {code}
> Test
> org.apache.flink.runtime.leaderelection.ZooKeeperMultipleComponentLeaderElectionDriverTest.testLeaderElectionWithMultipleDrivers
> is running.
> --------------------------------------------------------------------------------
> 17:15:10,437 [ Thread-16] INFO
> org.apache.curator.test.TestingZooKeeperMain [] - Starting
> server
> 17:15:10,450 [ main] INFO
> org.apache.flink.runtime.util.ZooKeeperUtils [] - Enforcing
> default ACL for ZK connections
> 17:15:10,451 [ main] INFO
> org.apache.flink.runtime.util.ZooKeeperUtils [] - Using
> '/flink/default' as Zookeeper namespace.
> 17:15:10,452 [ main] INFO
> org.apache.flink.shaded.curator5.org.apache.curator.framework.imps.CuratorFrameworkImpl
> [] - Starting
> 17:15:10,455 [ main] INFO
> org.apache.flink.shaded.curator5.org.apache.curator.framework.imps.CuratorFrameworkImpl
> [] - Default schema
> 17:15:10,462 [ main-EventThread] INFO
> org.apache.flink.shaded.curator5.org.apache.curator.framework.state.ConnectionStateManager
> [] - State change: CONNECTED
> 17:15:10,467 [ main-EventThread] INFO
> org.apache.flink.shaded.curator5.org.apache.curator.framework.imps.EnsembleTracker
> [] - New config event received: {}
> 17:15:10,482 [Curator-ConnectionStateManager-0] DEBUG
> org.apache.flink.runtime.leaderelection.ZooKeeperMultipleComponentLeaderElectionDriver
> [] - Connected to ZooKeeper quorum. Leader election can start.
> 17:15:10,483 [Curator-ConnectionStateManager-0] DEBUG
> org.apache.flink.runtime.leaderelection.ZooKeeperMultipleComponentLeaderElectionDriver
> [] - Connected to ZooKeeper quorum. Leader election can start.
> 17:15:10,483 [Curator-ConnectionStateManager-0] DEBUG
> org.apache.flink.runtime.leaderelection.ZooKeeperMultipleComponentLeaderElectionDriver
> [] - Connected to ZooKeeper quorum. Leader election can start.
> 17:15:10,484 [ main-EventThread] INFO
> org.apache.flink.shaded.curator5.org.apache.curator.framework.imps.EnsembleTracker
> [] - New config event received: {}
> 17:15:10,562 [ main-EventThread] DEBUG
> org.apache.flink.runtime.leaderelection.ZooKeeperMultipleComponentLeaderElectionDriver
> [] - ZooKeeperMultipleComponentLeaderElectionDriver obtained the leadership.
> 17:15:10,600 [ main] INFO
> org.apache.flink.runtime.leaderelection.ZooKeeperMultipleComponentLeaderElectionDriver
> [] - Closing ZooKeeperMultipleComponentLeaderElectionDriver.
> {code}
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