benwtrent commented on PR #13475:
URL: https://github.com/apache/lucene/pull/13475#issuecomment-2158343032
Here is an example of an assertion tripping:
```
java.lang.AssertionError: DocValuesProducer are only supposed to be consumed
in the thread in which they have been acquired. But was acquired in
Thread[#12828,Lucene Merge Thread #6109,5,TGRP-TestAssertingDocValuesFormat]
and consumed in
Thread[#12830,pool-1-thread-2,5,TGRP-TestAssertingDocValuesFormat].
at
org.apache.lucene.tests.codecs.asserting.AssertingCodec.assertThread(AssertingCodec.java:44)
at
org.apache.lucene.tests.codecs.asserting.AssertingDocValuesFormat$AssertingDocValuesProducer.getNumeric(AssertingDocValuesFormat.java:232)
at
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsReader.getNumeric(PerFieldDocValuesFormat.java:323)
at
org.apache.lucene.codecs.DocValuesConsumer$1.getNumeric(DocValuesConsumer.java:201)
at
org.apache.lucene.tests.codecs.asserting.AssertingDocValuesFormat$AssertingDocValuesConsumer.addNumericField(AssertingDocValuesFormat.java:76)
at
org.apache.lucene.codecs.DocValuesConsumer.mergeNumericField(DocValuesConsumer.java:183)
at
org.apache.lucene.codecs.DocValuesConsumer.merge(DocValuesConsumer.java:142)
at
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.merge(PerFieldDocValuesFormat.java:152)
at
org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:205)
at
org.apache.lucene.index.SegmentMerger.mergeWithLogging(SegmentMerger.java:325)
at
org.apache.lucene.index.SegmentMerger.lambda$merge$1(SegmentMerger.java:155)
at
org.apache.lucene.search.TaskExecutor$TaskGroup.lambda$createTask$0(TaskExecutor.java:117)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at
org.apache.lucene.index.ConcurrentMergeScheduler$CachedExecutor.lambda$execute$0(ConcurrentMergeScheduler.java:982)
```
It seems to me that maybe we want to adjust the assertion? Maybe set
`currentThread` to the first viewed thread when the values are read and assert
that its always the same?
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