Merge pull request #5419

12a49ca Limit the number of new addressses to accumulate (Pieter Wuille)

src/net.h

@@ -44,6 +44,8 @@ static const int PING_INTERVAL = 2 * 60;
 static const int TIMEOUT_INTERVAL = 20 * 60;
 /** The maximum number of entries in an 'inv' protocol message */
 static const unsigned int MAX_INV_SZ = 50000;
+/** The maximum number of new addresses to accumulate before announcing. */
+static const unsigned int MAX_ADDR_TO_SEND = 1000;
 /** -listen default */
 static const bool DEFAULT_LISTEN = true;
 /** -upnp default */
@@ -368,8 +370,13 @@ public:
         // Known checking here is only to save space from duplicates.
         // SendMessages will filter it again for knowns that were added
         // after addresses were pushed.
-        if (addr.IsValid() && !setAddrKnown.count(addr))
-            vAddrToSend.push_back(addr);
+        if (addr.IsValid() && !setAddrKnown.count(addr)) {
+            if (vAddrToSend.size() >= MAX_ADDR_TO_SEND) {
+                vAddrToSend[insecure_rand() % vAddrToSend.size()] = addr;
+            } else {
+                vAddrToSend.push_back(addr);
+            }
+        }
     }