franz1981 commented on a change in pull request #2494: ARTEMIS-2224 Reduce
contention on LivePageCacheImpl
URL: https://github.com/apache/activemq-artemis/pull/2494#discussion_r248691840
##########
File path:
artemis-server/src/main/java/org/apache/activemq/artemis/core/paging/cursor/impl/LivePageCacheImpl.java
##########
@@ -16,30 +16,31 @@
*/
package org.apache.activemq.artemis.core.paging.cursor.impl;
-import java.util.LinkedList;
-import java.util.List;
-
import org.apache.activemq.artemis.core.paging.PagedMessage;
import org.apache.activemq.artemis.core.paging.cursor.LivePageCache;
import org.apache.activemq.artemis.core.paging.impl.Page;
import org.apache.activemq.artemis.core.server.LargeServerMessage;
+import
org.apache.activemq.artemis.utils.collections.ConcurrentAppendOnlyChunkedList;
import org.jboss.logging.Logger;
/**
* This is the same as PageCache, however this is for the page that's being
currently written.
*/
-public class LivePageCacheImpl implements LivePageCache {
+public final class LivePageCacheImpl implements LivePageCache {
private static final Logger logger =
Logger.getLogger(LivePageCacheImpl.class);
- private final List<PagedMessage> messages = new LinkedList<>();
+ private static final int CHUNK_SIZE = 32;
Review comment:
@qihongxu This should do the "trick" to improve things when is expected an
heavy usage of paging with small messages and big pages: if you tweak this in a
separate branch (taken from master too) into `CHUNK_SIZE = 64*1024` it would
save many cache misses and it should speedup in a visible way the paged message
queries.
You can give it a try and if it should work we can think to expose it or
just provide an cursor-like implementation instead of a generic query that
would give more hints about which access pattern could be used eg sequential I
suppose. Many thanks for the tests/efforts and intuitions! :+1:
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