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penghui pushed a commit to branch branch-2.9
in repository https://gitbox.apache.org/repos/asf/pulsar.git

commit 89e005f939fa4400bc1be5a9058264d9e071622a
Author: Jiwei Guo <[email protected]>
AuthorDate: Wed Jun 1 11:09:01 2022 +0800

    Fix NPE in MessageDeduplication. (#15820)
    
    (cherry picked from commit 01d7bfa681b23d1a236b1411b83e854c9ad9323f)
---
 .../pulsar/broker/service/persistent/MessageDeduplication.java     | 2 +-
 .../pulsar/broker/service/persistent/MessageDuplicationTest.java   | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git 
a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/MessageDeduplication.java
 
b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/MessageDeduplication.java
index 55d35201fe5..5b29a4f15c7 100644
--- 
a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/MessageDeduplication.java
+++ 
b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/MessageDeduplication.java
@@ -490,7 +490,7 @@ public class MessageDeduplication {
                 hasInactive = true;
             }
         }
-        if (hasInactive) {
+        if (hasInactive && isEnabled()) {
             takeSnapshot(getManagedCursor().getMarkDeletedPosition());
         }
     }
diff --git 
a/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/persistent/MessageDuplicationTest.java
 
b/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/persistent/MessageDuplicationTest.java
index 76caccadcc9..0e1b37b5160 100644
--- 
a/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/persistent/MessageDuplicationTest.java
+++ 
b/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/persistent/MessageDuplicationTest.java
@@ -202,6 +202,13 @@ public class MessageDuplicationTest {
         messageDeduplication.purgeInactiveProducers();
         assertEquals(inactiveProducers.size(), 3);
 
+        doReturn(false).when(messageDeduplication).isEnabled();
+        inactiveProducers.put(producerName2, System.currentTimeMillis() - 
80000);
+        inactiveProducers.put(producerName3, System.currentTimeMillis() - 
80000);
+        messageDeduplication.purgeInactiveProducers();
+        assertFalse(inactiveProducers.containsKey(producerName2));
+        assertFalse(inactiveProducers.containsKey(producerName3));
+        doReturn(true).when(messageDeduplication).isEnabled();
         // Modify the inactive time of produce2 and produce3
         // messageDeduplication.purgeInactiveProducers() will remove producer2 
and producer3
         inactiveProducers.put(producerName2, System.currentTimeMillis() - 
70000);

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