didip opened a new issue #11653:
URL: https://github.com/apache/druid/issues/11653
### Affected Version
0.21.1
### Description
```
2021-09-01T00:27:08,408 ERROR [LeaderSelector[/druid/overlord/_OVERLORD]]
org.apache.druid.curator.discovery.CuratorDruidLeaderSelector - listener
becomeLeader() failed. Unable to become leader:
{class=org.apache.druid.curator.discovery.CuratorDruidLeaderSelector,
exceptionType=class java.lang.RuntimeException,
exceptionMessage=org.apache.druid.java.util.common.ISE: Could not reacquire
lock on interval[2021-08-29T00:00:00.000Z/2021-08-30T00:00:00.000Z]
version[2021-08-31T23:32:28.782Z] for task:
index_parallel_mytable_aplllohg_2021-08-31T13:15:38.699Z}
java.lang.RuntimeException: org.apache.druid.java.util.common.ISE: Could not
reacquire lock on interval[2021-08-29T00:00:00.000Z/2021-08-30T00:00:00.000Z]
version[2021-08-31T23:32:28.782Z] for task:
index_parallel_mytable_aplllohg_2021-08-31T13:15:38.699Z
at
org.apache.druid.indexing.overlord.TaskMaster$1.becomeLeader(TaskMaster.java:159)
~[druid-indexing-service-0.21.1.jar:0.21.1]
at
org.apache.druid.curator.discovery.CuratorDruidLeaderSelector$1.isLeader(CuratorDruidLeaderSelector.java:97)
[druid-server-0.21.1.jar:0.21.1]
at
org.apache.curator.framework.recipes.leader.LeaderLatch$9.apply(LeaderLatch.java:702)
[curator-recipes-4.3.0.jar:4.3.0]
at
org.apache.curator.framework.recipes.leader.LeaderLatch$9.apply(LeaderLatch.java:698)
[curator-recipes-4.3.0.jar:4.3.0]
at
org.apache.curator.framework.listen.ListenerContainer$1.run(ListenerContainer.java:100)
[curator-framework-4.3.0.jar:4.3.0]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_302]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_302]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_302]
```
The error above completely prevented any Overlord instances to become a
leader. Is this error so important that Overlord cannot perform election?
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