Limit the number of new addressses to accumulate

Rebased-From: 12a49ca

Author: sipa

src/net.h

@@ -40,6 +40,8 @@ namespace boost {
 static const unsigned int MAX_INV_SZ = 50000;
 /** The maximum number of entries in mapAskFor */
 static const size_t MAPASKFOR_MAX_SZ = MAX_INV_SZ;
+/** The maximum number of new addresses to accumulate before announcing. */
+static const unsigned int MAX_ADDR_TO_SEND = 1000;
 
 inline unsigned int ReceiveFloodSize() { return 1000*GetArg("-maxreceivebuffer", 5*1000); }
 inline unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", 1*1000); }
@@ -400,8 +402,13 @@ class CNode
         // 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);
+            }
+        }
     }