BewareMyPower commented on code in PR #16943:
URL: https://github.com/apache/pulsar/pull/16943#discussion_r950028292


##########
pulsar-client-cpp/tests/ConsumerTest.cc:
##########
@@ -763,4 +763,36 @@ TEST(ConsumerTest, testPartitionsWithCloseUnblock) {
     thread.join();
 }
 
+TEST(ConsumerTest, testGetLastMessageIdBlockWhenConnectionDisconnected) {
+    int operationTimeout = 10;

Review Comment:
   10 seconds might be too long for a single test, maybe you can reduce it to 5 
seconds (just a suggestion).



##########
pulsar-client-cpp/lib/ConsumerImpl.cc:
##########
@@ -1326,8 +1336,26 @@ void 
ConsumerImpl::getLastMessageIdAsync(BrokerGetLastMessageIdCallback callback
             callback(ResultUnsupportedVersionError, MessageId());
         }
     } else {
-        LOG_ERROR(getName() << " Client Connection not ready for Consumer");
-        callback(ResultNotConnected, MessageId());
+        TimeDuration next = std::min(remainTime, backoff->next());
+        if (next.total_milliseconds() <= 0) {
+            LOG_ERROR(getName() << " Client Connection not ready for 
Consumer");
+            callback(ResultNotConnected, MessageId());
+            return;
+        }
+        remainTime -= next;
+
+        timer->expires_from_now(next);
+
+        timer->async_wait([this, backoff, remainTime, timer, next,
+                           callback](const boost::system::error_code& ec) -> 
void {
+            if (ec) {
+                LOG_DEBUG(getName() << " Get last message id operation was 
cancelled, code[" << ec << "].");
+                return;
+            }

Review Comment:
   `if (ec)` (in short for `if (ec != 0)`) doesn't always mean the operation is 
cancelled. See how we process the error code in 
https://github.com/apache/pulsar/blob/3ecf34abf99afd7c53a681ab82d5bcec2bc499a1/pulsar-client-cpp/lib/ClientConnection.cc#L594-L598



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