Forest0923 commented on PR #19961:
URL: https://github.com/apache/kafka/pull/19961#issuecomment-3022144635
I'm not exactly sure why `mmap` became null, but perhaps we need to acquire
the write lock in `append` or `truncateToEntries()`?
I was able to reproduce the issue locally by increasing `maxOffset` like
below:
```diff
diff --git a/core/src/test/scala/unit/kafka/log/LogConcurrencyTest.scala
b/core/src/test/scala/unit/kafka/log/LogConcurrencyTest.scala
index 854be39808..06421fd96a 100644
--- a/core/src/test/scala/unit/kafka/log/LogConcurrencyTest.scala
+++ b/core/src/test/scala/unit/kafka/log/LogConcurrencyTest.scala
@@ -67,7 +67,7 @@ class LogConcurrencyTest {
def testUncommittedDataNotConsumed(log: UnifiedLog): Unit = {
val executor = Executors.newFixedThreadPool(2)
try {
- val maxOffset = 5000
+ val maxOffset = 10000
val consumer = new ConsumerTask(log, maxOffset)
val appendTask = new LogAppendTask(log, maxOffset)
```
Applying the following change seems to fix the issue:
```diff
diff --git
a/storage/src/main/java/org/apache/kafka/storage/internals/log/OffsetIndex.java
b/storage/src/main/java/org/apache/kafka/storage/internals/log/OffsetIndex.java
index 04d68e9a54..89875484f7 100644
---
a/storage/src/main/java/org/apache/kafka/storage/internals/log/OffsetIndex.java
+++
b/storage/src/main/java/org/apache/kafka/storage/internals/log/OffsetIndex.java
@@ -212,7 +212,7 @@ public final class OffsetIndex extends AbstractIndex {
* Truncates index to a known number of entries.
*/
private void truncateToEntries(int entries) {
- inLock(() -> {
+ inRemapWriteLockThrows(() -> {
super.truncateToEntries0(entries);
this.lastOffset = lastEntry().offset;
log.debug("Truncated index {} to {} entries; position is now {}
and last offset is now {}",
```
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