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https://issues.apache.org/jira/browse/ARTEMIS-2224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16738858#comment-16738858
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ASF GitHub Bot commented on ARTEMIS-2224:
-----------------------------------------
Github user clebertsuconic commented on a diff in the pull request:
https://github.com/apache/activemq-artemis/pull/2494#discussion_r246601217
--- Diff:
artemis-commons/src/main/java/org/apache/activemq/artemis/utils/collections/ConcurrentAppendOnlyChunkedList.java
---
@@ -0,0 +1,291 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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.
+ */
+package org.apache.activemq.artemis.utils.collections;
+
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicLongFieldUpdater;
+import java.util.concurrent.atomic.AtomicReferenceArray;
+import java.util.function.IntFunction;
+
+/**
+ * This collection is a concurrent append-only list that grows in
chunks.<br>
+ * It's safe to be used by many threads concurrently and has a max
capacity of {@link Integer#MAX_VALUE}.
+ */
+public final class ConcurrentAppendOnlyChunkedList<T> {
--- End diff --
This is a lot better!
> Reduce contention on LivePageCacheImpl
> --------------------------------------
>
> Key: ARTEMIS-2224
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2224
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 2.7.0
> Reporter: Francesco Nigro
> Assignee: Francesco Nigro
> Priority: Major
>
> Has been measured that LIvePageCacheImpl operations are a source of
> contention on producer side while paging.
> This contention decrease the scalability of the broker in an evident way
> while using topics, because the page cache is been accessed concurrently by
> several producers to ack transactions while the messages are being appended.
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