kafka: expand members updated by group::update_member

Up to now, group::update_member function would only update the
protocols of the group_member. The fields updated now include the
client id and host fields and the session and rebalance timeout
durations.

src/v/kafka/server/group.cc

@@ -360,13 +360,20 @@ ss::future<join_group_response> group::add_member(member_ptr member) {
 }
 
 void group::update_member_no_join(
-  member_ptr member, chunked_vector<member_protocol>&& new_protocols) {
+  member_ptr member,
+  chunked_vector<member_protocol>&& new_protocols,
+  const std::optional<kafka::client_id>& new_client_id,
+  const kafka::client_host& new_client_host,
+  std::chrono::milliseconds new_session_timeout,
+  std::chrono::milliseconds new_rebalance_timeout) {
     vlog(
       _ctxlog.trace,
-      "Updating {}joining member {} with protocols {}",
+      "Updating {}joining member {} with protocols {} and timeouts {}/{}",
       member->is_joining() ? "" : "non-",
       member,
-      new_protocols);
+      new_protocols,
+      new_session_timeout,
+      new_rebalance_timeout);
 
     /*
      * before updating the member, subtract its existing protocols from
@@ -386,11 +393,29 @@ void group::update_member_no_join(
     for (auto& p : member->protocols()) {
         _supported_protocols[p.name]++;
     }
+
+    if (new_client_id) {
+        member->replace_client_id(*new_client_id);
+    }
+    member->replace_client_host(new_client_host);
+    member->replace_session_timeout(new_session_timeout);
+    member->replace_rebalance_timeout(new_rebalance_timeout);
 }
 
 ss::future<join_group_response> group::update_member(
-  member_ptr member, chunked_vector<member_protocol>&& new_protocols) {
-    update_member_no_join(member, std::move(new_protocols));
+  member_ptr member,
+  chunked_vector<member_protocol>&& new_protocols,
+  const std::optional<kafka::client_id>& new_client_id,
+  const kafka::client_host& new_client_host,
+  std::chrono::milliseconds new_session_timeout,
+  std::chrono::milliseconds new_rebalance_timeout) {
+    update_member_no_join(
+      member,
+      std::move(new_protocols),
+      new_client_id,
+      new_client_host,
+      new_session_timeout,
+      new_rebalance_timeout);
 
     if (!member->is_joining()) {
         _num_members_joining++;
@@ -696,7 +721,23 @@ group::join_group_stages group::update_static_member_and_rebalance(
      * with new member id.</kafka>
      */
     schedule_next_heartbeat_expiration(member);
-    auto f = update_member(member, native_member_protocols(r));
+
+    kafka::client_id old_client_id = member->client_id();
+    kafka::client_host old_client_host = member->client_host();
+    auto old_session_timeout
+      = std::chrono::duration_cast<std::chrono::milliseconds>(
+        member->session_timeout());
+    auto old_rebalance_timeout
+      = std::chrono::duration_cast<std::chrono::milliseconds>(
+        member->rebalance_timeout());
+
+    auto f = update_member(
+      member,
+      native_member_protocols(r),
+      r.client_id,
+      r.client_host,
+      r.data.session_timeout_ms,
+      r.data.rebalance_timeout_ms);
     auto old_protocols = _members.at(new_member_id)->protocols().copy();
     switch (state()) {
     case group_state::stable: {
@@ -715,7 +756,11 @@ group::join_group_stages group::update_static_member_and_rebalance(
                          instance_id = *r.data.group_instance_id,
                          new_member_id = std::move(new_member_id),
                          old_member_id = std::move(old_member_id),
-                         old_protocols = std::move(old_protocols)](
+                         old_protocols = std::move(old_protocols),
+                         old_client_id = std::move(old_client_id),
+                         old_client_host = std::move(old_client_host),
+                         old_session_timeout = old_session_timeout,
+                         old_rebalance_timeout = old_rebalance_timeout](
                           result<raft::replicate_result> result) mutable {
                       if (!result) {
                           vlog(
@@ -728,7 +773,12 @@ group::join_group_stages group::update_static_member_and_rebalance(
                           auto member = replace_static_member(
                             instance_id, new_member_id, old_member_id);
                           update_member_no_join(
-                            member, std::move(old_protocols));
+                            member,
+                            std::move(old_protocols),
+                            old_client_id,
+                            old_client_host,
+                            old_session_timeout,
+                            old_rebalance_timeout);
                           schedule_next_heartbeat_expiration(member);
                           try_finish_joining_member(
                             member,
@@ -1036,7 +1086,12 @@ group::join_group_stages group::add_member_and_rebalance(
 group::join_group_stages
 group::update_member_and_rebalance(member_ptr member, join_group_request&& r) {
     auto response = update_member(
-      std::move(member), native_member_protocols(r));
+      std::move(member),
+      native_member_protocols(r),
+      r.client_id,
+      r.client_host,
+      r.data.session_timeout_ms,
+      r.data.rebalance_timeout_ms);
     try_prepare_rebalance();
     return join_group_stages(std::move(response));
 }

src/v/kafka/server/group.h

@@ -396,13 +396,24 @@ class group final : public ss::enable_lw_shared_from_this<group> {
      * \returns join response promise set at the end of the join phase.
      */
     ss::future<join_group_response> update_member(
-      member_ptr member, chunked_vector<member_protocol>&& new_protocols);
+      member_ptr member,
+      chunked_vector<member_protocol>&& new_protocols,
+      const std::optional<kafka::client_id>& new_client_id,
+      const kafka::client_host& new_client_host,
+      std::chrono::milliseconds new_session_timeout,
+      std::chrono::milliseconds new_rebalance_timeout);
+
     /**
      * Same as update_member but without returning the join promise. Used when
      * reverting member state after failed group checkpoint
      */
     void update_member_no_join(
-      member_ptr member, chunked_vector<member_protocol>&& new_protocols);
+      member_ptr member,
+      chunked_vector<member_protocol>&& new_protocols,
+      const std::optional<kafka::client_id>& new_client_id,
+      const kafka::client_host& new_client_host,
+      std::chrono::milliseconds new_session_timeout,
+      std::chrono::milliseconds new_rebalance_timeout);
 
     /**
      * \brief Get the timeout duration for rebalancing.

src/v/kafka/server/member.h

@@ -104,6 +104,22 @@ class group_member {
 
     void replace_id(member_id new_id) { _state.id = std::move(new_id); }
 
+    /// Get the member's client_id.
+    const kafka::client_id& client_id() const { return _state.client_id; }
+
+    /// Replace the member's client_id.
+    void replace_client_id(kafka::client_id new_client_id) {
+        _state.client_id = std::move(new_client_id);
+    }
+
+    /// Get the member's client_host.
+    const kafka::client_host& client_host() const { return _state.client_host; }
+
+    /// Replace the member's client_host.
+    void replace_client_host(kafka::client_host new_client_host) {
+        _state.client_host = std::move(new_client_host);
+    }
+
     /// Get the id of the member's group.
     const kafka::group_id& group_id() const { return _group_id; }
 
@@ -115,9 +131,21 @@ class group_member {
     /// Get the member's session timeout.
     duration_type session_timeout() const { return _state.session_timeout; }
 
+    /// Replace the member's session timeout.
+    void
+    replace_session_timeout(std::chrono::milliseconds new_session_timeout) {
+        _state.session_timeout = new_session_timeout;
+    }
+
     /// Get the member's rebalance timeout.
     duration_type rebalance_timeout() const { return _state.rebalance_timeout; }
 
+    /// Replace the member's rebalance timeout.
+    void
+    replace_rebalance_timeout(std::chrono::milliseconds new_rebalance_timeout) {
+        _state.rebalance_timeout = new_rebalance_timeout;
+    }
+
     /// Get the member's protocol type.
     const kafka::protocol_type& protocol_type() const { return _protocol_type; }
 

src/v/kafka/server/tests/group_test.cc

@@ -10,6 +10,7 @@
 #include "cluster/partition.h"
 #include "config/configuration.h"
 #include "container/fragmented_vector.h"
+#include "kafka/protocol/types.h"
 #include "kafka/server/group.h"
 #include "kafka/server/group_metadata.h"
 #include "utils/to_string.h"
@@ -21,6 +22,8 @@
 #include <boost/uuid/uuid.hpp>
 #include <boost/uuid/uuid_generators.hpp>
 
+#include <chrono>
+
 using namespace std::chrono_literals;
 namespace kafka {
 
@@ -499,4 +502,72 @@ SEASTAR_THREAD_TEST_CASE(group_state_output) {
     BOOST_TEST(s == "PreparingRebalance");
 }
 
+SEASTAR_THREAD_TEST_CASE(add_new_static_member) {
+    auto g = get();
+    const kafka::group_id common_group_id = g.id();
+    const kafka::group_instance_id common_instance_id{"0-0"};
+
+    const kafka::member_id m1_id{"m1"};
+    const kafka::client_id m1_client_id{"client-id-1"};
+    const kafka::client_host m1_client_host{"client-host-1"};
+    const std::chrono::milliseconds m1_session_timeout{30001};
+    const std::chrono::milliseconds m1_rebalance_timeout{45001};
+
+    // Create request for first member
+    join_group_request r1;
+    r1.client_id = m1_client_id;
+    r1.client_host = m1_client_host;
+    r1.data.group_id = common_group_id;
+    r1.data.group_instance_id = common_instance_id;
+    r1.data.session_timeout_ms = m1_session_timeout;
+    r1.data.rebalance_timeout_ms = m1_rebalance_timeout;
+
+    // adding first static member will call "add_member_and_rebalance"
+    g.add_new_static_member(m1_id, std::move(r1));
+
+    // validate group state
+    BOOST_TEST(g.contains_member(m1_id));
+
+    // validate new member
+    const auto m1 = g.get_member(m1_id);
+    BOOST_TEST(m1->group_id() == common_group_id);
+    BOOST_TEST(m1->id() == m1_id);
+    BOOST_TEST(m1->client_id() == m1_client_id);
+    BOOST_TEST(m1->client_host() == m1_client_host);
+    BOOST_TEST(m1->session_timeout() == m1_session_timeout);
+    BOOST_TEST(m1->rebalance_timeout() == m1_rebalance_timeout);
+
+    const kafka::member_id m2_id{"m2"};
+    const kafka::client_id m2_client_id{"client-id-2"};
+    const kafka::client_host m2_client_host{"client-host-2"};
+    const std::chrono::milliseconds m2_session_timeout{30002};
+    const std::chrono::milliseconds m2_rebalance_timeout{45002};
+
+    // Create request for second member to update m1
+    join_group_request r2;
+    r2.client_id = m2_client_id;
+    r2.client_host = m2_client_host;
+    r2.data.group_id = common_group_id;
+    r2.data.group_instance_id = common_instance_id;
+    r2.data.session_timeout_ms = m2_session_timeout;
+    r2.data.rebalance_timeout_ms = m2_rebalance_timeout;
+
+    // adding second static member will call
+    // "update_static_member_and_rebalance"
+    g.add_new_static_member(m2_id, std::move(r2));
+
+    // validate group state
+    BOOST_TEST(!g.contains_member(m1_id));
+    BOOST_TEST(g.contains_member(m2_id));
+
+    // validate updated member
+    const auto m2 = g.get_member(m2_id);
+    BOOST_TEST(m2->group_id() == common_group_id);
+    BOOST_TEST(m2->id() == m2_id);
+    BOOST_TEST(m2->client_id() == m2_client_id);
+    BOOST_TEST(m2->client_host() == m2_client_host);
+    BOOST_TEST(m2->session_timeout() == m2_session_timeout);
+    BOOST_TEST(m2->rebalance_timeout() == m2_rebalance_timeout);
+}
+
 } // namespace kafka