@eolivelli stack points to the mock / List used in the mock.
@sijie I cannot repro this locally, ran the test suite in the loop for a long
time.
my guess the following patch should help but I cannot repro the failure even
without it.
Can you give it a try?
```
diff --git
a/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/MdcContextTest.java
b/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/MdcContextTest.java
index f10427b8b..535b97a4b 100644
---
a/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/MdcContextTest.java
+++
b/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/MdcContextTest.java
@@ -32,8 +32,8 @@ import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import java.io.File;
-import java.util.LinkedList;
-import java.util.List;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentLinkedQueue;
import lombok.extern.slf4j.Slf4j;
@@ -69,7 +69,7 @@ public class MdcContextTest extends BookKeeperClusterTestCase
{
LedgerHandle lh;
private Appender mockAppender;
- private List<String> capturedEvents;
+ private Queue<String> capturedEvents;
private Logger rootLogger = LogManager.getRootLogger();
public MdcContextTest() {
@@ -122,7 +122,7 @@ public class MdcContextTest extends
BookKeeperClusterTestCase {
rootLogger.addAppender(mockAppender);
rootLogger.setLevel(Level.INFO);
- capturedEvents = new LinkedList<>();
+ capturedEvents = new ConcurrentLinkedQueue<>();
doAnswer(answerVoid((LoggingEvent event) -> capturedEvents.add(
mdcFormat(event.getMDC(MDC_REQUEST_ID),
event.getRenderedMessage())
```
[ Full content available at: https://github.com/apache/bookkeeper/issues/1696 ]
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