kennknowles opened a new issue, #18655:
URL: https://github.com/apache/beam/issues/18655

   With info messages with something like:
   > `Refused to split GroupingShuffleReader <unstarted in shuffle range 
[ShufflePosition(base64:AAAAA1CWNvgAAQ), 
ShufflePosition(base64:AAAAA4sOz1AAAQ))> at 
ShufflePosition(base64:AAAAA1CWNvkAAQ)`
   > 
   > e lull messages look like this:
   > `Processing lull for PT300.006S in state read-shuffle of Write 
Vectors2/GroupIntoShards/Read at 
com.google.cloud.dataflow.worker.ApplianceShuffleReader.readIncludingPosition(Native
 Method) at 
com.google.cloud.dataflow.worker.ChunkingShuffleBatchReader.read(ChunkingShuffleBatchReader.java:62)
 at 
com.google.cloud.dataflow.worker.util.common.worker.CachingShuffleBatchReader$1.load(CachingShuffleBatchReader.java:57)
 at 
com.google.cloud.dataflow.worker.util.common.worker.CachingShuffleBatchReader$1.load(CachingShuffleBatchReader.java:53)
 at 
com.google.cloud.dataflow.worker.repackaged.com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3628)
 at 
com.google.cloud.dataflow.worker.repackaged.com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2336)
 at 
com.google.cloud.dataflow.worker.repackaged.com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2295)
 at com.google.cloud.dataflow.worker.repackaged.com.google.common.cac
 he.LocalCache$Segment.get(LocalCache.java:2208) at 
com.google.cloud.dataflow.worker.repackaged.com.google.common.cache.LocalCache.get(LocalCache.java:4053)
 at 
com.google.cloud.dataflow.worker.repackaged.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4057)
 at 
com.google.cloud.dataflow.worker.repackaged.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4986)
 at 
com.google.cloud.dataflow.worker.util.common.worker.CachingShuffleBatchReader.read(CachingShuffleBatchReader.java:76)
 at 
com.google.cloud.dataflow.worker.util.common.worker.BatchingShuffleEntryReader$ShuffleReadIterator.fillEntries(BatchingShuffleEntryReader.java:133)
 at 
com.google.cloud.dataflow.worker.util.common.worker.BatchingShuffleEntryReader$ShuffleReadIterator.fillEntriesIfNeeded(BatchingShuffleEntryReader.java:126)
 at 
com.google.cloud.dataflow.worker.util.common.worker.BatchingShuffleEntryReader$ShuffleReadIterator.hasNext(BatchingShuffleEntryReader.java:90)
 at com.google.cloud.data
 
flow.worker.util.common.ForwardingReiterator.hasNext(ForwardingReiterator.java:62)
 at 
com.google.cloud.dataflow.worker.util.common.worker.GroupingShuffleEntryIterator.advance(GroupingShuffleEntryIterator.java:118)
 at 
com.google.cloud.dataflow.worker.GroupingShuffleReader$GroupingShuffleReaderIterator.advance(GroupingShuffleReader.java:230)
 at 
com.google.cloud.dataflow.worker.GroupingShuffleReader$GroupingShuffleReaderIterator.start(GroupingShuffleReader.java:224)
 at 
com.google.cloud.dataflow.worker.util.common.worker.ReadOperation$SynchronizedReaderIterator.start(ReadOperation.java:347)
 at 
com.google.cloud.dataflow.worker.util.common.worker.ReadOperation.runReadLoop(ReadOperation.java:183)
 at 
com.google.cloud.dataflow.worker.util.common.worker.ReadOperation.start(ReadOperation.java:148)
 at 
com.google.cloud.dataflow.worker.util.common.worker.MapTaskExecutor.execute(MapTaskExecutor.java:68)
 at 
com.google.cloud.dataflow.worker.DataflowWorker.executeWork(DataflowWorker.java:330)
 at com.
 google.cloud.dataflow.worker.DataflowWorker.doWork(DataflowWorker.java:302) at 
com.google.cloud.dataflow.worker.DataflowWorker.getAndPerformWork(DataflowWorker.java:251)
 at 
com.google.cloud.dataflow.worker.DataflowBatchWorkerHarness$WorkerThread.doWork(DataflowBatchWorkerHarness.java:135)
 at 
com.google.cloud.dataflow.worker.DataflowBatchWorkerHarness$WorkerThread.call(DataflowBatchWorkerHarness.java:115)
 at 
com.google.cloud.dataflow.worker.DataflowBatchWorkerHarness$WorkerThread.call(DataflowBatchWorkerHarness.java:102)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266) at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
at java.lang.Thread.run(Thread.java:745)`
   > 
   
   Imported from Jira 
[BEAM-3487](https://issues.apache.org/jira/browse/BEAM-3487). Original Jira may 
contain additional context.
   Reported by: ikarienator.


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