[GitHub] XiaoZYang commented on a change in pull request #1397: Issue 1069: Provide a setting in consumer configuration to specify where to start consuming messages

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XiaoZYang commented on a change in pull request #1397: Issue 1069: Provide a setting in consumer configuration to specify where to start consuming messages
URL: https://github.com/apache/incubator-pulsar/pull/1397#discussion_r175251734
 
 

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 File path: managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
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 @@ -2030,6 +2039,22 @@ PositionImpl getMarkDeletePositionOfSlowestConsumer() {
         return Pair.create(pos, count);
     }
 
+    /**
+     * Get the first position written in the managed ledger, alongside with the associated counter
+     */
+    Pair<PositionImpl, Long> getFirstPositionAndCounter() {
+        PositionImpl pos;
+        long count;
+        Pair<PositionImpl, Long> lastPositionAndCounter;
+
+        do {
+            pos = getFirstPosition();
+            lastPositionAndCounter = getLastPositionAndCounter();
+            count = lastPositionAndCounter.second - getNumberOfEntries(Range.openClosed(pos, lastPositionAndCounter.first));
+        } while (pos.compareTo(getFirstPosition()) != 0 && lastPositionAndCounter.first.compareTo(getLastPosition()) != 0);
 
 Review comment:
   Yes, I'll correct it!

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