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https://issues.apache.org/jira/browse/ARTEMIS-2321?focusedWorklogId=234380&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-234380
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ASF GitHub Bot logged work on ARTEMIS-2321:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 29/Apr/19 08:19
Start Date: 29/Apr/19 08:19
Worklog Time Spent: 10m
Work Description: michaelandrepearce commented on pull request #2645:
ARTEMIS-2321 Paging scalability and GC improvement
URL: https://github.com/apache/activemq-artemis/pull/2645#discussion_r279270065
##########
File path:
artemis-core-client/src/main/java/org/apache/activemq/artemis/utils/SoftValueLongObjectHashMap.java
##########
@@ -21,26 +21,26 @@
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
-import java.util.HashMap;
-import java.util.HashSet;
+import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
-import java.util.concurrent.atomic.AtomicLong;
+import io.netty.util.collection.LongObjectHashMap;
+import io.netty.util.collection.LongObjectMap;
import org.jboss.logging.Logger;
-public class SoftValueHashMap<K, V extends SoftValueHashMap.ValueCache>
implements Map<K, V> {
+public class SoftValueLongObjectHashMap<V extends
SoftValueLongObjectHashMap.ValueCache> implements LongObjectMap<V> {
- private static final Logger logger =
Logger.getLogger(SoftValueHashMap.class);
+ private static final Logger logger =
Logger.getLogger(SoftValueLongObjectHashMap.class);
// The soft references that are already good.
// too bad there's no way to override the queue method on ReferenceQueue,
so I wouldn't need this
private final ReferenceQueue<V> refQueue = new ReferenceQueue<>();
- private final Map<K, AggregatedSoftReference> mapDelegate = new HashMap<>();
+ private final LongObjectMap<AggregatedSoftReference<V>> mapDelegate = new
LongObjectHashMap<>();
Review comment:
Youre missing something. You missing the wonder of the jvm at runtime. It
like you have a method in interface that takes object. Your impl has to support
that but it can implement the same name with a tighter typing and that will be
invoked instead.
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Issue Time Tracking
-------------------
Worklog Id: (was: 234380)
Time Spent: 4h 10m (was: 4h)
> Paging scalability and GC improvements
> --------------------------------------
>
> Key: ARTEMIS-2321
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2321
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 2.8.0
> Reporter: Francesco Nigro
> Priority: Major
> Fix For: 2.9.0
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> PageCursorProviderImpl::getPageCache's on cache miss is blocking the whole
> softCache until the requested page isn't fully read, making other threads
> unable to make progress by querying the cache.
> It would be better to make the page read operation a non-blocking operation
> for the whole cache, allowing threads that need different pageId to make
> progress.
> Other improvements:
> * PageCursorProviderImpl can use specialized primitive hash maps to reduce
> memory footprint (that would cause some page entries to be collected
> prematurely)
> * PageCache children can avoid to maintain a reference to a Page
> * PagingStoreImpl perform many unnecessary volatile stores/loads and some
> fields can be turned into plain ones, avoiding expensive atomic operations
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