Author: markt
Date: Wed Apr 6 20:07:05 2016
New Revision: 1738039
URL: http://svn.apache.org/viewvc?rev=1738039&view=rev
Log:
Fix https://bz.apache.org/bugzilla/show_bug.cgi?id=59269
Correct the implementation of PersistentManagerBase so that minIdleSwap
functions as designed and sessions are swapped out to keep the active session
count below maxActiveSessions
Added:
tomcat/trunk/test/org/apache/catalina/session/TestPersistentManager.java
(with props)
Modified:
tomcat/trunk/java/org/apache/catalina/session/PersistentManagerBase.java
tomcat/trunk/webapps/docs/changelog.xml
tomcat/trunk/webapps/docs/config/manager.xml
Modified:
tomcat/trunk/java/org/apache/catalina/session/PersistentManagerBase.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/session/PersistentManagerBase.java?rev=1738039&r1=1738038&r2=1738039&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/session/PersistentManagerBase.java
(original)
+++ tomcat/trunk/java/org/apache/catalina/session/PersistentManagerBase.java
Wed Apr 6 20:07:05 2016
@@ -162,16 +162,18 @@ public abstract class PersistentManagerB
/**
- * Minimum time a session must be idle before it is swapped to disk.
- * This overrides maxActiveSessions, to prevent thrashing if there are lots
- * of active sessions. Setting to {@code -1} means it's ignored.
+ * The minimum time in seconds a session must be idle before it is eligible
+ * to be swapped to disk to keep the active session count below
+ * maxActiveSessions. Setting to {@code -1} means sessions will not be
+ * swapped out to keep the active session count down.
*/
protected int minIdleSwap = -1;
+
/**
- * The maximum time a session may be idle before it should be swapped
- * to file just on general principle. Setting this to {@code -1} means
sessions
- * should not be forced out.
+ * The maximum time in seconds a session may be idle before it is eligible
+ * to be swapped to disk due to inactivity. Setting this to {@code -1}
means
+ * sessions should not be swapped out just because of inactivity.
*/
protected int maxIdleSwap = -1;
@@ -233,19 +235,20 @@ public abstract class PersistentManagerB
/**
- * @return The time in seconds after which a session should be swapped out
of
- * memory to disk.
+ * @return The maximum time in seconds a session may be idle before it is
+ * eligible to be swapped to disk due to inactivity. A value of {@code -1}
+ * means sessions should not be swapped out just because of inactivity.
*/
public int getMaxIdleSwap() {
-
return maxIdleSwap;
-
}
/**
- * Sets the time in seconds after which a session should be swapped out of
- * memory to disk.
+ * Sets the maximum time in seconds a session may be idle before it is
+ * eligible to be swapped to disk due to inactivity. Setting this to
+ * {@code -1} means sessions should not be swapped out just because of
+ * inactivity.
*
* @param max time in seconds to wait for possible swap out
*/
@@ -258,26 +261,25 @@ public abstract class PersistentManagerB
support.firePropertyChange("maxIdleSwap",
Integer.valueOf(oldMaxIdleSwap),
Integer.valueOf(this.maxIdleSwap));
-
}
/**
- * @return The minimum time in seconds that a session must be idle before
- * it can be swapped out of memory, or {@code -1} if it can be swapped out
- * at any time.
+ * @return The minimum time in seconds a session must be idle before it is
+ * eligible to be swapped to disk to keep the active session count below
+ * maxActiveSessions. A value of {@code -1} means sessions will not be
+ * swapped out to keep the active session count down.
*/
public int getMinIdleSwap() {
-
return minIdleSwap;
-
}
/**
- * Sets the minimum time in seconds that a session must be idle before
- * it can be swapped out of memory due to maxActiveSession. Set it to
{@code -1}
- * if it can be swapped out at any time.
+ * Sets the minimum time in seconds a session must be idle before it is
+ * eligible to be swapped to disk to keep the active session count below
+ * maxActiveSessions. Setting to {@code -1} means sessions will not be
+ * swapped out to keep the active session count down.
*
* @param min time in seconds before a possible swap out
*/
@@ -941,7 +943,9 @@ public abstract class PersistentManagerB
Session sessions[] = findSessions();
// FIXME: Smarter algorithm (LRU)
- if (getMaxActiveSessions() >= sessions.length)
+ int limit = (int) (getMaxActiveSessions() * 0.9);
+
+ if (limit >= sessions.length)
return;
if(log.isDebugEnabled())
@@ -949,7 +953,7 @@ public abstract class PersistentManagerB
("persistentManager.tooManyActive",
Integer.valueOf(sessions.length)));
- int toswap = sessions.length - getMaxActiveSessions();
+ int toswap = sessions.length - limit;
for (int i = 0; i < sessions.length && toswap > 0; i++) {
StandardSession session = (StandardSession) sessions[i];
Added: tomcat/trunk/test/org/apache/catalina/session/TestPersistentManager.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/test/org/apache/catalina/session/TestPersistentManager.java?rev=1738039&view=auto
==============================================================================
--- tomcat/trunk/test/org/apache/catalina/session/TestPersistentManager.java
(added)
+++ tomcat/trunk/test/org/apache/catalina/session/TestPersistentManager.java
Wed Apr 6 20:07:05 2016
@@ -0,0 +1,58 @@
+/*
+ * 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.catalina.session;
+
+import org.apache.catalina.Context;
+import org.apache.catalina.Host;
+import org.apache.tomcat.unittest.TesterContext;
+import org.apache.tomcat.unittest.TesterHost;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestPersistentManager {
+
+ @Test
+ public void testMinIdleSwap() throws Exception {
+ PersistentManager manager = new PersistentManager();
+ manager.setStore(new TesterStore());
+
+ Host host = new TesterHost();
+ Context context = new TesterContext();
+ context.setParent(host);
+
+ manager.setContext(context);
+
+ manager.setMaxActiveSessions(2);
+ manager.setMinIdleSwap(0);
+
+ manager.start();
+
+ // Create the maximum number of sessions
+ manager.createSession(null);
+ manager.createSession(null);
+
+ // Given the minIdleSwap settings, this should swap one out to get
below
+ // the limit
+ manager.processPersistenceChecks();
+ Assert.assertEquals(1, manager.getActiveSessions());
+ Assert.assertEquals(2, manager.getActiveSessionsFull());
+
+ manager.createSession(null);
+ Assert.assertEquals(2, manager.getActiveSessions());
+ Assert.assertEquals(3, manager.getActiveSessionsFull());
+ }
+}
Propchange:
tomcat/trunk/test/org/apache/catalina/session/TestPersistentManager.java
------------------------------------------------------------------------------
svn:eol-style = native
Modified: tomcat/trunk/webapps/docs/changelog.xml
URL:
http://svn.apache.org/viewvc/tomcat/trunk/webapps/docs/changelog.xml?rev=1738039&r1=1738038&r2=1738039&view=diff
==============================================================================
--- tomcat/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/trunk/webapps/docs/changelog.xml Wed Apr 6 20:07:05 2016
@@ -107,6 +107,12 @@
and <code>host</code> attributes define as
<code>TransientAttribute</code>. (kfujino)
</fix>
+ <fix>
+ <bug>59269</bug>: Correct the implementation of
+ <code>PersistentManagerBase</code> so that <code>minIdleSwap</code>
+ functions as designed and sessions are swapped out to keep the active
+ session count below <code>maxActiveSessions</code>. (markt)
+ </fix>
</changelog>
</subsection>
<subsection name="Coyote">
Modified: tomcat/trunk/webapps/docs/config/manager.xml
URL:
http://svn.apache.org/viewvc/tomcat/trunk/webapps/docs/config/manager.xml?rev=1738039&r1=1738038&r2=1738039&view=diff
==============================================================================
--- tomcat/trunk/webapps/docs/config/manager.xml (original)
+++ tomcat/trunk/webapps/docs/config/manager.xml Wed Apr 6 20:07:05 2016
@@ -215,21 +215,21 @@
</attribute>
<attribute name="maxIdleSwap" required="false">
- <p>The time interval (in seconds) since the last access to a session
- before it should be persisted to the session store, and
- passivated out of the server's memory, or <code>-1</code> to disable
- this feature. If this feature is enabled, the time interval specified
- here should be equal to or longer than the value specified for
- <code>maxIdleBackup</code>. By default, this feature is disabled.</p>
+ <p>The maximum time a session may be idle before it is eligible to be
+ swapped to disk due to inactivity. Setting this to <code>-1</code>
means
+ sessions should not be swapped out just because of inactivity. If this
+ feature is enabled, the time interval specified here should be equal to
+ or longer than the value specified for <code>maxIdleBackup</code>. By
+ default, this feature is disabled.</p>
</attribute>
<attribute name="minIdleSwap" required="false">
- <p>The time interval (in seconds) since the last access to a session
- before it will be eligible to be persisted to the session store, and
- passivated out of the server's memory, or <code>-1</code> for this
- swapping to be available at any time. If specified, this value should
- be less than that specified by <code>maxIdleSwap</code>. By default,
- this value is set to <code>-1</code>.</p>
+ <p>The minimum time in seconds a session must be idle before it is
+ eligible to be swapped to disk to keep the active session count below
+ maxActiveSessions. Setting to <code>-1</code> means sessions will not
be
+ swapped out to keep the active session count down. If specified, this
+ value should be less than that specified by <code>maxIdleSwap</code>.
+ By default, this value is set to <code>-1</code>.</p>
</attribute>
<attribute name="processExpiresFrequency" required="false">
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