s1monw commented on PR #12549:
URL: https://github.com/apache/lucene/pull/12549#issuecomment-1778953836
I think this is only triggered because of your change but the problem was
already there. We hold the lock in MDW#close() such that we can not run a
concurrent merge. We could either prevent the merge with something like this:
```diff
index bc1f95e0b58..f9acdd55793 100644
---
a/lucene/test-framework/src/java/org/apache/lucene/tests/store/MockDirectoryWrapper.java
+++
b/lucene/test-framework/src/java/org/apache/lucene/tests/store/MockDirectoryWrapper.java
@@ -970,7 +970,10 @@ public class MockDirectoryWrapper extends
BaseDirectoryWrapper {
DirectoryReader ir1 = DirectoryReader.open(this);
int numDocs1 = ir1.numDocs();
ir1.close();
- new IndexWriter(this, new IndexWriterConfig(null)).close();
+ new IndexWriter(this, new IndexWriterConfig(null)
+ .setCommitOnClose(false)
+ .setMaxFullFlushMergeWaitMillis(0))
+ .close();
DirectoryReader ir2 = DirectoryReader.open(this);
int numDocs2 = ir2.numDocs();
ir2.close();
```
or use a `SerialMergeScheduler` to run the merge in the caller thread. I
would opt for the MergeScheduler. WDYT
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