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AMQ-7082 - ensure flush sees free list, use lazySet to avoid store barrier, thanks cshannon

This commit is contained in:
gtully 2018-10-22 15:16:26 +01:00 committed by Jeff Genender
parent c6103415b9
commit a9b81ace62
1 changed files with 6 additions and 5 deletions
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11
activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/disk/page/PageFile.java
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@ -39,6 +39,7 @@ import java.util.TreeMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.zip.Adler32;
import java.util.zip.Checksum;
@ -134,7 +135,7 @@ public class PageFile {
// Keeps track of free pages.
private final AtomicLong nextFreePageId = new AtomicLong();
private SequenceSet freeList = new SequenceSet();
private SequenceSet recoveredFreeList = null;
private AtomicReference<SequenceSet> recoveredFreeList = new AtomicReference<SequenceSet>();
private final AtomicLong nextTxid = new AtomicLong();
// Persistent settings stored in the page file.
@ -469,8 +470,8 @@ public class PageFile {
LOG.info(toString() + ". Recovered pageFile free list of size: " + newFreePages.rangeSize());
if (!newFreePages.isEmpty()) {
// allow flush (with index lock held) to merge
recoveredFreeList = newFreePages;
// allow flush (with index lock held) to merge eventually
recoveredFreeList.lazySet(newFreePages);
}
// all set for clean shutdown
needsFreePageRecovery = false;
@ -561,9 +562,9 @@ public class PageFile {
throw new IOException("Page file already stopped: checkpointing is not allowed");
}
SequenceSet toMerge = recoveredFreeList;
SequenceSet toMerge = recoveredFreeList.get();
if (toMerge != null) {
recoveredFreeList = null;
recoveredFreeList.lazySet(null);
Sequence seq = toMerge.getHead();
while (seq != null) {
freeList.add(seq);