Clone HeartBeatState when building gossip messages. Make its generation/version 
volatile.

Patch by Joel Knighton; reviewed by Jason Brown for CASSANDRA-13700


Project: http://git-wip-us.apache.org/repos/asf/cassandra/repo
Commit: http://git-wip-us.apache.org/repos/asf/cassandra/commit/2290c0d4
Tree: http://git-wip-us.apache.org/repos/asf/cassandra/tree/2290c0d4
Diff: http://git-wip-us.apache.org/repos/asf/cassandra/diff/2290c0d4

Branch: refs/heads/cassandra-3.11
Commit: 2290c0d4b0c20ce3407ae2c542e580c75a5ab337
Parents: 77aba07
Author: Joel Knighton <j...@apache.org>
Authored: Thu Jul 20 11:08:08 2017 -0500
Committer: Joel Knighton <j...@apache.org>
Committed: Mon Jul 24 14:45:09 2017 -0500

----------------------------------------------------------------------
 CHANGES.txt                                           | 1 +
 src/java/org/apache/cassandra/gms/Gossiper.java       | 5 +++--
 src/java/org/apache/cassandra/gms/HeartBeatState.java | 4 ++--
 3 files changed, 6 insertions(+), 4 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/cassandra/blob/2290c0d4/CHANGES.txt
----------------------------------------------------------------------
diff --git a/CHANGES.txt b/CHANGES.txt
index 5173b10..4dbd984 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,5 @@
 2.1.19
+ * Clone HeartBeatState when building gossip messages. Make its 
generation/version volatile (CASSANDRA-13700)
 
 
 2.1.18

http://git-wip-us.apache.org/repos/asf/cassandra/blob/2290c0d4/src/java/org/apache/cassandra/gms/Gossiper.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/gms/Gossiper.java 
b/src/java/org/apache/cassandra/gms/Gossiper.java
index 889806c..7c37917 100644
--- a/src/java/org/apache/cassandra/gms/Gossiper.java
+++ b/src/java/org/apache/cassandra/gms/Gossiper.java
@@ -860,10 +860,11 @@ public class Gossiper implements 
IFailureDetectionEventListener, GossiperMBean
              * than the version passed in. In this case we also send the old
              * heart beat and throw it away on the receiver if it is redundant.
             */
+            int localHbGeneration = 
epState.getHeartBeatState().getGeneration();
             int localHbVersion = 
epState.getHeartBeatState().getHeartBeatVersion();
             if (localHbVersion > version)
             {
-                reqdEndpointState = new 
EndpointState(epState.getHeartBeatState());
+                reqdEndpointState = new EndpointState(new 
HeartBeatState(localHbGeneration, localHbVersion));
                 if (logger.isTraceEnabled())
                     logger.trace("local heartbeat version " + localHbVersion + 
" greater than " + version + " for " + forEndpoint);
             }
@@ -876,7 +877,7 @@ public class Gossiper implements 
IFailureDetectionEventListener, GossiperMBean
                 {
                     if (reqdEndpointState == null)
                     {
-                        reqdEndpointState = new 
EndpointState(epState.getHeartBeatState());
+                        reqdEndpointState = new EndpointState(new 
HeartBeatState(localHbGeneration, localHbVersion));
                     }
                     final ApplicationState key = entry.getKey();
                     if (logger.isTraceEnabled())

http://git-wip-us.apache.org/repos/asf/cassandra/blob/2290c0d4/src/java/org/apache/cassandra/gms/HeartBeatState.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/gms/HeartBeatState.java 
b/src/java/org/apache/cassandra/gms/HeartBeatState.java
index 0ae48bf..901f1c7 100644
--- a/src/java/org/apache/cassandra/gms/HeartBeatState.java
+++ b/src/java/org/apache/cassandra/gms/HeartBeatState.java
@@ -30,8 +30,8 @@ class HeartBeatState
 {
     public static final IVersionedSerializer<HeartBeatState> serializer = new 
HeartBeatStateSerializer();
 
-    private int generation;
-    private int version;
+    private volatile int generation;
+    private volatile int version;
 
     HeartBeatState(int gen)
     {


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