Better handle request with same group id

runtime/binding-kafka/src/test/java/io/aklivity/zilla/runtime/binding/kafka/internal/stream/ClientGroupIT.java

@@ -186,4 +186,14 @@ public void shouldRebalanceMultipleMembersWithSameGroupId() throws Exception
     {
         k3po.finish();
     }
+
+    @Test
+    @Configuration("client.yaml")
+    @Specification({
+        "${app}/rebalance.protocol.highlander.heartbeat.unknown.member/client",
+        "${net}/rebalance.protocol.highlander.heartbeat.unknown.member/server"})
+    public void shouldRebalanceProtocolHighlanderOnHeartbeatUnknownMember() throws Exception
+    {
+        k3po.finish();
+    }
 }

specs/binding-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/kafka/streams/application/group/rebalance.protocol.highlander.heartbeat.unknown.member/client.rpt

@@ -0,0 +1,72 @@
+#
+# Copyright 2021-2023 Aklivity Inc.
+#
+# Aklivity licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+
+connect "zilla://streams/app0"
+    option zilla:window 8192
+    option zilla:transmission "half-duplex"
+
+write zilla:begin.ext ${kafka:beginEx()
+                               .typeId(zilla:id("kafka"))
+                               .group()
+                                   .groupId("test")
+                                   .protocol("highlander")
+                                   .timeout(45000)
+                                   .build()
+                               .build()}
+
+connected
+
+read zilla:begin.ext ${kafka:matchBeginEx()
+                               .typeId(zilla:id("kafka"))
+                               .group()
+                                   .groupId("test")
+                                   .protocol("highlander")
+                                   .timeout(30000)
+                                   .build()
+                               .build()}
+
+read advised zilla:flush ${kafka:flushEx()
+                             .typeId(zilla:id("kafka"))
+                             .group()
+                                 .leaderId("memberId-1")
+                                 .memberId("memberId-1")
+                                 .members("memberId-1")
+                                 .build()
+                             .build()}
+
+write zilla:data.empty
+write flush
+
+read zilla:data.empty
+
+write advise zilla:flush
+
+read advised zilla:flush ${kafka:flushEx()
+                             .typeId(zilla:id("kafka"))
+                             .group()
+                                 .leaderId("memberId-2")
+                                 .memberId("memberId-2")
+                                 .members("memberId-2")
+                                 .build()
+                             .build()}
+
+write zilla:data.empty
+write flush
+
+read zilla:data.empty
+
+write close
+read closed

specs/binding-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/kafka/streams/application/group/rebalance.protocol.highlander.heartbeat.unknown.member/server.rpt

@@ -0,0 +1,76 @@
+#
+# Copyright 2021-2023 Aklivity Inc.
+#
+# Aklivity licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+
+property serverAddress "zilla://streams/app0"
+
+accept ${serverAddress}
+    option zilla:window 8192
+    option zilla:transmission "half-duplex"
+
+accepted
+
+read zilla:begin.ext ${kafka:matchBeginEx()
+                               .typeId(zilla:id("kafka"))
+                               .group()
+                                   .groupId("test")
+                                   .protocol("highlander")
+                                   .timeout(45000)
+                                   .build()
+                               .build()}
+
+connected
+
+write zilla:begin.ext ${kafka:beginEx()
+                               .typeId(zilla:id("kafka"))
+                               .group()
+                                   .groupId("test")
+                                   .protocol("highlander")
+                                   .timeout(30000)
+                                   .build()
+                               .build()}
+write flush
+
+write advise zilla:flush ${kafka:flushEx()
+                             .typeId(zilla:id("kafka"))
+                             .group()
+                                 .leaderId("memberId-1")
+                                 .memberId("memberId-1")
+                                 .members("memberId-1")
+                                 .build()
+                             .build()}
+
+read zilla:data.empty
+
+write zilla:data.empty
+write flush
+
+read advised zilla:flush
+
+write advise zilla:flush ${kafka:flushEx()
+                             .typeId(zilla:id("kafka"))
+                             .group()
+                                 .leaderId("memberId-2")
+                                 .memberId("memberId-2")
+                                 .members("memberId-2")
+                                 .build()
+                             .build()}
+
+read zilla:data.empty
+
+write zilla:data.empty
+
+read closed
+write close