[bugfix] AppendRecordsContext cannot be Recyclable (#1967)

(cherry picked from commit 0b6fd77)

### Motivation

AppendRecordsContext cannot be Recyclable.

### Modifications

Don't recycle the AppendRecordsContext.

Co-authored-by: Enrico Olivelli <[email protected]>

Author: gaoran10

kafka-impl/src/main/java/io/streamnative/pulsar/handlers/kop/KafkaRequestHandler.java

@@ -875,7 +875,6 @@ protected void handleProduceRequest(KafkaHeaderAndRequest produceHar,
                         PartitionLog.AppendOrigin.Client,
                         appendRecordsContext
                 ).whenComplete((response, ex) -> {
-                    appendRecordsContext.recycle();
                     if (ex != null) {
                         resultFuture.completeExceptionally(ex.getCause());
                         return;
@@ -2449,7 +2448,6 @@ protected void handleWriteTxnMarkers(KafkaHeaderAndRequest kafkaHeaderAndRequest
                     PartitionLog.AppendOrigin.Coordinator,
                     appendRecordsContext
             ).whenComplete((result, ex) -> {
-                appendRecordsContext.recycle();
                 if (ex != null) {
                     log.error("[{}] Append txn marker ({}) failed.", ctx.channel(), marker, ex);
                     Map<TopicPartition, Errors> currentErrors = new HashMap<>();

kafka-impl/src/main/java/io/streamnative/pulsar/handlers/kop/storage/AppendRecordsContext.java

@@ -14,59 +14,39 @@
 package io.streamnative.pulsar.handlers.kop.storage;
 
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.util.Recycler;
 import io.streamnative.pulsar.handlers.kop.KafkaTopicManager;
 import io.streamnative.pulsar.handlers.kop.PendingTopicFutures;
 import java.util.Map;
 import java.util.function.Consumer;
+import lombok.AllArgsConstructor;
 import lombok.Getter;
+import lombok.extern.slf4j.Slf4j;
 import org.apache.kafka.common.TopicPartition;
 
 /**
  * AppendRecordsContext is use for pass parameters to ReplicaManager, to avoid long parameter lists.
  */
+@Slf4j
+@AllArgsConstructor
 @Getter
 public class AppendRecordsContext {
-    private static final Recycler<AppendRecordsContext> RECYCLER = new Recycler<AppendRecordsContext>() {
-        protected AppendRecordsContext newObject(Handle<AppendRecordsContext> handle) {
-            return new AppendRecordsContext(handle);
-        }
-    };
-
-    private final Recycler.Handle<AppendRecordsContext> recyclerHandle;
     private KafkaTopicManager topicManager;
     private Consumer<Integer> startSendOperationForThrottling;
     private Consumer<Integer> completeSendOperationForThrottling;
     private Map<TopicPartition, PendingTopicFutures> pendingTopicFuturesMap;
     private ChannelHandlerContext ctx;
 
-    private AppendRecordsContext(Recycler.Handle<AppendRecordsContext> recyclerHandle) {
-        this.recyclerHandle = recyclerHandle;
-    }
-
     // recycler and get for this object
     public static AppendRecordsContext get(final KafkaTopicManager topicManager,
                                            final Consumer<Integer> startSendOperationForThrottling,
                                            final Consumer<Integer> completeSendOperationForThrottling,
                                            final Map<TopicPartition, PendingTopicFutures> pendingTopicFuturesMap,
                                            final ChannelHandlerContext ctx) {
-        AppendRecordsContext context = RECYCLER.get();
-        context.topicManager = topicManager;
-        context.startSendOperationForThrottling = startSendOperationForThrottling;
-        context.completeSendOperationForThrottling = completeSendOperationForThrottling;
-        context.pendingTopicFuturesMap = pendingTopicFuturesMap;
-        context.ctx = ctx;
-
-        return context;
-    }
-
-    public void recycle() {
-        topicManager = null;
-        startSendOperationForThrottling = null;
-        completeSendOperationForThrottling = null;
-        pendingTopicFuturesMap = null;
-        recyclerHandle.recycle(this);
-        ctx = null;
+        return new AppendRecordsContext(topicManager,
+                startSendOperationForThrottling,
+                completeSendOperationForThrottling,
+                pendingTopicFuturesMap,
+                ctx);
     }
 
 }