aoli-al opened a new issue, #13571:
URL: https://github.com/apache/lucene/issues/13571
### Description
I saw the following assertion failure when running
TestSnapshotDeletionPolicy#testMultiThreadedSnapshotting
```
Caused by: java.lang.AssertionError: seqNo=9 vs maxSeqNo=8
at
org.apache.lucene.index.DocumentsWriterDeleteQueue.getNextSequenceNumber(DocumentsWriterDeleteQueue.java:567)
at
org.apache.lucene.index.DocumentsWriterDeleteQueue.updateSlice(DocumentsWriterDeleteQueue.java:286)
at
org.apache.lucene.index.DocumentsWriterPerThread.finishDocuments(DocumentsWriterPerThread.java:344)
at
org.apache.lucene.index.DocumentsWriterPerThread.updateDocuments(DocumentsWriterPerThread.java:284)
at
org.apache.lucene.index.DocumentsWriter.updateDocuments(DocumentsWriter.java:425)
at
org.apache.lucene.index.IndexWriter.updateDocuments(IndexWriter.java:1552)
at
org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1837)
at
org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1477)
at
org.apache.lucene.index.TestSnapshotDeletionPolicy$2.run(TestSnapshotDeletionPolicy.java:302)
```
This failure might also be related to #13446 and #13127. Please apply the
following patch to reproduce the failure. It takes ~30 seconds to show the
error.
```
diff --git
a/lucene/core/src/java/org/apache/lucene/index/ConcurrentApproximatePriorityQueue.java
b/lucene/core/src/java/org/apache/lucene/index/ConcurrentApproximatePriorityQueue.java
index 8a8fc72ab4c..12e05293a19 100644
---
a/lucene/core/src/java/org/apache/lucene/index/ConcurrentApproximatePriorityQueue.java
+++
b/lucene/core/src/java/org/apache/lucene/index/ConcurrentApproximatePriorityQueue.java
@@ -38,7 +38,7 @@ final class ConcurrentApproximatePriorityQueue<T> {
int concurrency = coreCount / 4;
concurrency = Math.max(MIN_CONCURRENCY, concurrency);
concurrency = Math.min(MAX_CONCURRENCY, concurrency);
- return concurrency;
+ return 3;
}
final int concurrency;
diff --git
a/lucene/core/src/java/org/apache/lucene/index/DocumentsWriter.java
b/lucene/core/src/java/org/apache/lucene/index/DocumentsWriter.java
index 7955df5630e..ba3c6f0d3f0 100644
--- a/lucene/core/src/java/org/apache/lucene/index/DocumentsWriter.java
+++ b/lucene/core/src/java/org/apache/lucene/index/DocumentsWriter.java
@@ -411,8 +411,33 @@ final class DocumentsWriter implements Closeable,
Accountable {
final DocumentsWriterDeleteQueue.Node<?> delNode)
throws IOException {
boolean hasEvents = preUpdate();
+ if (Thread.currentThread().getName().contains("t9")) {
+ try {
+ Thread.sleep(100000);
+ } catch (Exception e) {}
+ }
+ if (!Thread.currentThread().getName().contains("t0")) {
+ if (Thread.currentThread().getName().contains("t1")) {
+ try {
+ Thread.sleep(5000);
+ } catch (Exception e) {}
+ } else if (Thread.currentThread().getName().contains("t2")) {
+ try {
+ Thread.sleep(5000);
+ } catch (Exception e) {}
+ } else {
+ try {
+ Thread.sleep(1000);
+ } catch (Exception e) {}
+ }
+ }
final DocumentsWriterPerThread dwpt = flushControl.obtainAndLock();
+ if (!Thread.currentThread().getName().contains("t0") &&
!Thread.currentThread().getName().contains("t1") &&
!Thread.currentThread().getName().contains("t2")) {
### Version and environment details
Commit: 33a4c1d8ef999902dacedde9c7f04a3c7e2e78c9
Java version: openjdk 21.0.3 2024-04-16
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