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Posted to commits@activemq.apache.org by ta...@apache.org on 2012/08/22 01:28:51 UTC
svn commit: r1375852 - in /activemq/trunk:
activemq-core/src/main/java/org/apache/activemq/store/kahadb/plist/PList.java
kahadb/src/main/java/org/apache/kahadb/page/PageFile.java
Author: tabish
Date: Tue Aug 21 23:28:50 2012
New Revision: 1375852
URL: http://svn.apache.org/viewvc?rev=1375852&view=rev
Log:
updated fix: https://issues.apache.org/jira/browse/AMQ-3982
Instead of locking on the PList iterator which forces a lock on every access to hasNext we should lock down at the PageFile level in readPage making the seek and read an atomic operation. Since many reads on a single already loaded page don't need to be synchronized we pay a higher price for locking in the specific PList case than we do buy creating this atomic read operation in PageFile.
Modified:
activemq/trunk/activemq-core/src/main/java/org/apache/activemq/store/kahadb/plist/PList.java
activemq/trunk/kahadb/src/main/java/org/apache/kahadb/page/PageFile.java
Modified: activemq/trunk/activemq-core/src/main/java/org/apache/activemq/store/kahadb/plist/PList.java
URL: http://svn.apache.org/viewvc/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/store/kahadb/plist/PList.java?rev=1375852&r1=1375851&r2=1375852&view=diff
==============================================================================
--- activemq/trunk/activemq-core/src/main/java/org/apache/activemq/store/kahadb/plist/PList.java (original)
+++ activemq/trunk/activemq-core/src/main/java/org/apache/activemq/store/kahadb/plist/PList.java Tue Aug 21 23:28:50 2012
@@ -202,9 +202,7 @@ public class PList extends ListIndex<Str
@Override
public boolean hasNext() {
- synchronized (indexLock) {
- return iterator.hasNext();
- }
+ return iterator.hasNext();
}
@Override
Modified: activemq/trunk/kahadb/src/main/java/org/apache/kahadb/page/PageFile.java
URL: http://svn.apache.org/viewvc/activemq/trunk/kahadb/src/main/java/org/apache/kahadb/page/PageFile.java?rev=1375852&r1=1375851&r2=1375852&view=diff
==============================================================================
--- activemq/trunk/kahadb/src/main/java/org/apache/kahadb/page/PageFile.java (original)
+++ activemq/trunk/kahadb/src/main/java/org/apache/kahadb/page/PageFile.java Tue Aug 21 23:28:50 2012
@@ -16,7 +16,16 @@
*/
package org.apache.kahadb.page;
-import java.io.*;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
@@ -862,7 +871,7 @@ public class PageFile {
return nextTxid.incrementAndGet();
}
- void readPage(long pageId, byte[] data) throws IOException {
+ synchronized void readPage(long pageId, byte[] data) throws IOException {
readFile.seek(toOffset(pageId));
readFile.readFully(data);
}