XiaoZYang commented on a change in pull request #1219: Issue 1069: Provide a
setting in consumer configuration to specify where to start consuming messages
URL: https://github.com/apache/incubator-pulsar/pull/1219#discussion_r170821460
##########
File path:
managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
##########
@@ -2026,6 +2036,29 @@ 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;
+ long entries;
+ Pair<PositionImpl, Long> lastPositionAndCounter;
+
+ do {
+ pos = getFirstPosition();
+
+ lastPositionAndCounter = getLastPositionAndCounter();
+ entries = getNumberOfEntries();
+ count = lastPositionAndCounter.second - entries;
+
+ // Ensure no entry was written while reading the two values
+ } while (pos.compareTo(getFirstPosition()) != 0
+ && lastPositionAndCounter.first.compareTo(getLastPosition()) != 0);
+
+ return Pair.create(pos, count);
Review comment:
thanks for your comments, corresponding unit tests will be added soon.
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