[fix] [broker] rename to changeMaxReadPositionCount (apache#22656)

Author: thetumbled

pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java

@@ -76,8 +76,8 @@ public class TopicTransactionBuffer extends TopicTransactionBufferState implemen
      */
     private final LinkedMap<TxnID, PositionImpl> ongoingTxns = new LinkedMap<>();
 
-    // when add abort or change max read position, the count will +1. Take snapshot will set 0 into it.
-    private final AtomicLong changeMaxReadPositionAndAddAbortTimes = new AtomicLong();
+    // when change max read position, the count will +1. Take snapshot will reset the count.
+    private final AtomicLong changeMaxReadPositionCount = new AtomicLong();
 
     private final LongAdder txnCommittedCounter = new LongAdder();
 
@@ -429,15 +429,15 @@ private void handleLowWaterMark(TxnID txnID, long lowWaterMark) {
     }
 
     private void takeSnapshotByChangeTimes() {
-        if (changeMaxReadPositionAndAddAbortTimes.get() >= takeSnapshotIntervalNumber) {
-            this.changeMaxReadPositionAndAddAbortTimes.set(0);
+        if (changeMaxReadPositionCount.get() >= takeSnapshotIntervalNumber) {
+            this.changeMaxReadPositionCount.set(0);
             this.snapshotAbortedTxnProcessor.takeAbortedTxnsSnapshot(this.maxReadPosition);
         }
     }
 
     private void takeSnapshotByTimeout() {
-        if (changeMaxReadPositionAndAddAbortTimes.get() > 0) {
-            this.changeMaxReadPositionAndAddAbortTimes.set(0);
+        if (changeMaxReadPositionCount.get() > 0) {
+            this.changeMaxReadPositionCount.set(0);
             this.snapshotAbortedTxnProcessor.takeAbortedTxnsSnapshot(this.maxReadPosition);
         }
         this.timer.newTimeout(TopicTransactionBuffer.this,
@@ -454,7 +454,7 @@ void updateMaxReadPosition(TxnID txnID) {
             maxReadPosition = (PositionImpl) topic.getManagedLedger().getLastConfirmedEntry();
         }
         if (preMaxReadPosition.compareTo(this.maxReadPosition) != 0) {
-            this.changeMaxReadPositionAndAddAbortTimes.getAndIncrement();
+            this.changeMaxReadPositionCount.getAndIncrement();
         }
     }
 
@@ -489,7 +489,7 @@ public void syncMaxReadPositionForNormalPublish(PositionImpl position) {
             } else if (checkIfReady()) {
                 if (ongoingTxns.isEmpty()) {
                     maxReadPosition = position;
-                    changeMaxReadPositionAndAddAbortTimes.incrementAndGet();
+                    changeMaxReadPositionCount.incrementAndGet();
                 }
             }
         }

pulsar-broker/src/test/java/org/apache/pulsar/broker/transaction/TransactionTest.java

@@ -1095,20 +1095,20 @@ public void testCancelTxnTimeout() throws Exception{
     }
 
     @Test
-    public void testNotChangeMaxReadPositionAndAddAbortTimesWhenCheckIfNoSnapshot() throws Exception {
+    public void testNotChangeMaxReadPositionCountWhenCheckIfNoSnapshot() throws Exception {
         PersistentTopic persistentTopic = (PersistentTopic) getPulsarServiceList().get(0)
                 .getBrokerService()
-                .getTopic(NAMESPACE1 + "/changeMaxReadPositionAndAddAbortTimes" + UUID.randomUUID(), true)
+                .getTopic(NAMESPACE1 + "/changeMaxReadPositionCount" + UUID.randomUUID(), true)
                 .get().get();
         TransactionBuffer buffer = persistentTopic.getTransactionBuffer();
         Field processorField = TopicTransactionBuffer.class.getDeclaredField("snapshotAbortedTxnProcessor");
         processorField.setAccessible(true);
 
         AbortedTxnProcessor abortedTxnProcessor = (AbortedTxnProcessor) processorField.get(buffer);
         Field changeTimeField = TopicTransactionBuffer
-                .class.getDeclaredField("changeMaxReadPositionAndAddAbortTimes");
+                .class.getDeclaredField("changeMaxReadPositionCount");
         changeTimeField.setAccessible(true);
-        AtomicLong changeMaxReadPositionAndAddAbortTimes = (AtomicLong) changeTimeField.get(buffer);
+        AtomicLong changeMaxReadPositionCount = (AtomicLong) changeTimeField.get(buffer);
 
         Field field1 = TopicTransactionBufferState.class.getDeclaredField("state");
         field1.setAccessible(true);
@@ -1117,10 +1117,10 @@ public void testNotChangeMaxReadPositionAndAddAbortTimesWhenCheckIfNoSnapshot()
                     TopicTransactionBufferState.State state = (TopicTransactionBufferState.State) field1.get(buffer);
                     Assert.assertEquals(state, TopicTransactionBufferState.State.NoSnapshot);
         });
-        Assert.assertEquals(changeMaxReadPositionAndAddAbortTimes.get(), 0L);
+        Assert.assertEquals(changeMaxReadPositionCount.get(), 0L);
 
         buffer.syncMaxReadPositionForNormalPublish(new PositionImpl(1, 1));
-        Assert.assertEquals(changeMaxReadPositionAndAddAbortTimes.get(), 0L);
+        Assert.assertEquals(changeMaxReadPositionCount.get(), 0L);
 
     }