From 8c0d518f8c3424e6204eaf678edf59fde3d76af0 Mon Sep 17 00:00:00 2001
From: hrsakai <hsakai@yahoo-corp.jp>
Date: Thu, 5 Mar 2020 14:41:54 +0900
Subject: [PATCH] Avoid calling ConsumerImpl::redeliverMessages() when message
 list is empty

---
 pulsar-client-cpp/lib/NegativeAcksTracker.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pulsar-client-cpp/lib/NegativeAcksTracker.cc b/pulsar-client-cpp/lib/NegativeAcksTracker.cc
index 492e379459393..202c5e48825aa 100644
--- a/pulsar-client-cpp/lib/NegativeAcksTracker.cc
+++ b/pulsar-client-cpp/lib/NegativeAcksTracker.cc
@@ -74,7 +74,9 @@ void NegativeAcksTracker::handleTimer(const boost::system::error_code &ec) {
         }
     }
 
-    consumer_.redeliverMessages(messagesToRedeliver);
+    if (!messagesToRedeliver.empty()) {
+        consumer_.redeliverMessages(messagesToRedeliver);
+    }
     scheduleTimer();
 }