Skipping serialization of node attributes in Leader and follower checks

Signed-off-by: RS146BIJAY <[email protected]>
opensearch-project · Aug 22, 2024 · 36902de · 36902de
1 parent b830d68
commit 36902de
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Showing 3 changed files with 35 additions and 6 deletions.
diff --git a/server/src/main/java/org/opensearch/cluster/coordination/FollowersChecker.java b/server/src/main/java/org/opensearch/cluster/coordination/FollowersChecker.java
@@ -35,6 +35,7 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.message.ParameterizedMessage;
+import org.opensearch.Version;
 import org.opensearch.cluster.ClusterManagerMetrics;
 import org.opensearch.cluster.coordination.Coordinator.Mode;
 import org.opensearch.cluster.node.DiscoveryNode;
@@ -503,7 +504,11 @@ public FollowerCheckRequest(final StreamInput in) throws IOException {
         public void writeTo(final StreamOutput out) throws IOException {
             super.writeTo(out);
             out.writeLong(term);
-            sender.writeTo(out);
+            if (out.getVersion().onOrAfter(Version.V_3_0_0)) {
+                sender.writeToWithoutAttribute(out);
+            } else {
+                sender.writeTo(out);
+            }
         }
 
         @Override

diff --git a/server/src/main/java/org/opensearch/cluster/coordination/LeaderChecker.java b/server/src/main/java/org/opensearch/cluster/coordination/LeaderChecker.java
@@ -36,6 +36,7 @@
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.message.ParameterizedMessage;
 import org.opensearch.OpenSearchException;
+import org.opensearch.Version;
 import org.opensearch.cluster.ClusterManagerMetrics;
 import org.opensearch.cluster.node.DiscoveryNode;
 import org.opensearch.cluster.node.DiscoveryNodes;
@@ -416,7 +417,11 @@ static class LeaderCheckRequest extends TransportRequest {
         @Override
         public void writeTo(final StreamOutput out) throws IOException {
             super.writeTo(out);
-            sender.writeTo(out);
+            if (out.getVersion().onOrAfter(Version.V_3_0_0)) {
+                sender.writeToWithoutAttribute(out);
+            } else {
+                sender.writeTo(out);
+            }
         }
 
         public DiscoveryNode getSender() {

diff --git a/server/src/main/java/org/opensearch/cluster/node/DiscoveryNode.java b/server/src/main/java/org/opensearch/cluster/node/DiscoveryNode.java
@@ -358,17 +358,36 @@ public DiscoveryNode(StreamInput in) throws IOException {
 
     @Override
     public void writeTo(StreamOutput out) throws IOException {
+        writeToUtil(out, true);
+    }
+
+    public void writeToWithoutAttribute(StreamOutput out) throws IOException {
+        if (out.getVersion().onOrAfter(Version.V_3_0_0)) {
+            writeToUtil(out, false);
+        } else {
+            writeToUtil(out, true);
+        }
+
+    }
+
+    private void writeToUtil(StreamOutput out, boolean includeAttributes) throws IOException {
         out.writeString(nodeName);
         out.writeString(nodeId);
         out.writeString(ephemeralId);
         out.writeString(hostName);
         out.writeString(hostAddress);
         address.writeTo(out);
-        out.writeVInt(attributes.size());
-        for (Map.Entry<String, String> entry : attributes.entrySet()) {
-            out.writeString(entry.getKey());
-            out.writeString(entry.getValue());
+        if (includeAttributes) {
+            out.writeVInt(attributes.size());
+            for (Map.Entry<String, String> entry : attributes.entrySet()) {
+                out.writeString(entry.getKey());
+                out.writeString(entry.getValue());
+            }
+        } else {
+            // Set the size of attribute as 0 so that no attribute is read from stream on receiver node.
+            out.writeVInt(0);
         }
+
         out.writeVInt(roles.size());
         for (final DiscoveryNodeRole role : roles) {
             final DiscoveryNodeRole compatibleRole = role.getCompatibilityRole(out.getVersion());