[fix][broker]consumer backlog eviction policy should not reset read p…

…osition for consumer (#5) ### Motivation fix apache#18036 ### Modifications - The backlog eviction policy should use `asyncMarkDelete` instead of `resetCursor` in order to move the mark delete position.
HQebupt · Oct 19, 2022 · 98e9089 · 98e9089
1 parent c732852
commit 98e9089
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Showing 2 changed files with 18 additions and 7 deletions.
diff --git a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/BacklogQuotaManager.java b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/BacklogQuotaManager.java
@@ -210,22 +210,28 @@ private void dropBacklogForTimeLimit(PersistentTopic persistentTopic, BacklogQuo
             Long currentMillis = ((ManagedLedgerImpl) persistentTopic.getManagedLedger()).getClock().millis();
             ManagedLedgerImpl mLedger = (ManagedLedgerImpl) persistentTopic.getManagedLedger();
             try {
-                for (;;) {
+                for (; ; ) {
                     ManagedCursor slowestConsumer = mLedger.getSlowestConsumer();
                     Position oldestPosition = slowestConsumer.getMarkDeletedPosition();
+                    if (log.isDebugEnabled()) {
+                        log.debug("[{}] slowest consumer mark delete position is [{}], read position is [{}]",
+                                slowestConsumer.getName(), oldestPosition, slowestConsumer.getReadPosition());
+                    }
                     ManagedLedgerInfo.LedgerInfo ledgerInfo = mLedger.getLedgerInfo(oldestPosition.getLedgerId()).get();
                     if (ledgerInfo == null) {
-                        slowestConsumer.resetCursor(mLedger.getNextValidPosition((PositionImpl) oldestPosition));
+                        PositionImpl nextPosition =
+                                PositionImpl.get(mLedger.getNextValidLedger(oldestPosition.getLedgerId()), -1);
+                        slowestConsumer.markDelete(nextPosition);
                         continue;
                     }
                     // Timestamp only > 0 if ledger has been closed
                     if (ledgerInfo.getTimestamp() > 0
                             && currentMillis - ledgerInfo.getTimestamp() > quota.getLimitTime() * 1000) {
                         // skip whole ledger for the slowest cursor
-                        PositionImpl nextPosition = mLedger.getNextValidPosition(
-                                PositionImpl.get(ledgerInfo.getLedgerId(), ledgerInfo.getEntries() - 1));
+                        PositionImpl nextPosition =
+                                PositionImpl.get(mLedger.getNextValidLedger(ledgerInfo.getLedgerId()), -1);
                         if (!nextPosition.equals(oldestPosition)) {
-                            slowestConsumer.resetCursor(nextPosition);
+                            slowestConsumer.markDelete(nextPosition);
                             continue;
                         }
                     }

diff --git a/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/BacklogQuotaManagerTest.java b/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/BacklogQuotaManagerTest.java
@@ -35,6 +35,7 @@
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import lombok.Cleanup;
+import org.apache.bookkeeper.mledger.Position;
 import org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl;
 import org.apache.pulsar.broker.PulsarService;
 import org.apache.pulsar.broker.ServiceConfiguration;
@@ -512,18 +513,22 @@ public void testConsumerBacklogEvictionTimeQuota() throws Exception {
         assertEquals(stats.getSubscriptions().get(subName1).getMsgBacklog(), 14);
         assertEquals(stats.getSubscriptions().get(subName2).getMsgBacklog(), 14);
 
+        PersistentTopic topic1Reference = (PersistentTopic) pulsar.getBrokerService().getTopicReference(topic1).get();
+        ManagedLedgerImpl ml = (ManagedLedgerImpl) topic1Reference.getManagedLedger();
+        Position slowConsumerReadPos = ml.getSlowestConsumer().getReadPosition();
+
         Thread.sleep((TIME_TO_CHECK_BACKLOG_QUOTA * 2) * 1000);
         rolloverStats();
 
         TopicStats stats2 = getTopicStats(topic1);
-        PersistentTopic topic1Reference = (PersistentTopic) pulsar.getBrokerService().getTopicReference(topic1).get();
-        ManagedLedgerImpl ml = (ManagedLedgerImpl) topic1Reference.getManagedLedger();
         // Messages on first 2 ledgers should be expired, backlog is number of
         // message in current ledger.
         Awaitility.await().untilAsserted(() -> {
             assertEquals(stats2.getSubscriptions().get(subName1).getMsgBacklog(), ml.getCurrentLedgerEntries());
             assertEquals(stats2.getSubscriptions().get(subName2).getMsgBacklog(), ml.getCurrentLedgerEntries());
         });
+
+        assertEquals(ml.getSlowestConsumer().getReadPosition(), slowConsumerReadPos);
         client.close();
     }