clintropolis commented on issue #8580:
URL: https://github.com/apache/druid/issues/8580#issuecomment-1212537880

   this still happens when using `remote` for the `druid.indexer.runner.type`, 
apologies that stalebot closed this issue. I also ran into another issue when 
performing the same steps with similar outcome (though slightly worse since it 
breaks the task listing API as well).
   
   ```
   2022-08-09T23:08:21,703 WARN [qtp2066066225-85] 
org.eclipse.jetty.server.HttpChannel - /druid/indexer/v1/tasks
   java.lang.IllegalStateException: Duplicate key 
TaskRunnerWorkItem{taskId='index_kafka_wikipedia_stream_603bb609024a3d4_gnhkkopj',
 result=com.google.common.util.concurrent.SettableFuture@575af1d6, 
createdTime=2022-08-09T23:07:11.510Z, 
queueInsertionTime=2022-08-09T23:07:11.510Z, location=TaskLocation{host='null', 
port=-1, tlsPort=-1}}
        at 
java.util.stream.Collectors.lambda$throwingMerger$0(Collectors.java:133) 
~[?:1.8.0_332]
        at java.util.HashMap.merge(HashMap.java:1255) ~[?:1.8.0_332]
        at java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1320) 
~[?:1.8.0_332]
        at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169) 
~[?:1.8.0_332]
        at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[?:1.8.0_332]
        at 
java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
 ~[?:1.8.0_332]
        at 
java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) 
~[?:1.8.0_332]
        at 
java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) 
~[?:1.8.0_332]
        at 
java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) 
~[?:1.8.0_332]
        at 
java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) 
~[?:1.8.0_332]
        at 
java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566) 
~[?:1.8.0_332]
        at 
org.apache.druid.indexing.overlord.http.OverlordResource.getTaskRunnerWorkItems(OverlordResource.java:880)
 ~[classes/:?]
        at 
org.apache.druid.indexing.overlord.http.OverlordResource.getTaskStatusPlusList(OverlordResource.java:739)
 ~[classes/:?]
   ```
   
   Restarting the overlord seems to fix either issue. I have been unable to 
reproduce it using `httpRemote` for `druid.indexer.runner.type`, so that is a 
possible workaround.


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