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From schu...@apache.org
Subject svn commit: r1827981 - in /tomcat/tc8.5.x/trunk: ./ build.xml java/org/apache/catalina/valves/LoadBalancerDrainingValve.java test/org/apache/catalina/valves/TestLoadBalancerDrainingValve.java webapps/docs/changelog.xml webapps/docs/config/valve.xml
Date Thu, 29 Mar 2018 12:11:49 GMT
Author: schultz
Date: Thu Mar 29 12:11:49 2018
New Revision: 1827981

URL: http://svn.apache.org/viewvc?rev=1827981&view=rev
Log:
Back-port r1799498, r1799514 (partial), r1799677, and r1800980 to add LoadBalancerDrainingFilter
to Tomcat 8.5.x.

Added:
    tomcat/tc8.5.x/trunk/java/org/apache/catalina/valves/LoadBalancerDrainingValve.java
      - copied, changed from r1799498, tomcat/trunk/java/org/apache/catalina/valves/LoadBalancerDrainingValve.java
    tomcat/tc8.5.x/trunk/test/org/apache/catalina/valves/TestLoadBalancerDrainingValve.java
      - copied, changed from r1799498, tomcat/trunk/test/org/apache/catalina/valves/TestLoadBalancerDrainingValve.java
Modified:
    tomcat/tc8.5.x/trunk/   (props changed)
    tomcat/tc8.5.x/trunk/build.xml
    tomcat/tc8.5.x/trunk/webapps/docs/changelog.xml
    tomcat/tc8.5.x/trunk/webapps/docs/config/valve.xml

Propchange: tomcat/tc8.5.x/trunk/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Thu Mar 29 12:11:49 2018
@@ -1,2 +1,2 @@
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 756289,1756408-1756410,1756778,1756798,1756878,1756898,1756939,1757123-1757124,1757126,1757128,1757132-1757133,1757136,1757145,1757167-1757168,1757175,1757180,1757182,1757195,1757271,1757278,1757347,1757353-1757354,1757363,1757374,1757399,1757406,1757408,1757485,1757495,1757499,1757527,1757578,1757684,1757722,1757727,1757790,1757799,1757813,1757853,1757883,1757903,1757976,1757997,1758000,1758058,1758072-1758075,1758078-1758079,1758223,1758257,1758261,1758276,1758292,1758369,1758378-1758383,1758421,1758423,1758425-1758427,1758430,1758443,1758448,1758459,1758483,1758486-1758487,1758499,1758525,1758556,1758580,1758582,1758584,1758588,1758842,1759019,1759212,1759224,1759227,1759252,1759274,1759513-1759516,1759611,1759757,1759785-1759790,1760005,1760022,1760109-1760110,1760135,1760200-1760201,1760227,1760300,1760397,1760446,1760454,1760640,1760648,1761057,1761422,1761491,1761498,1761500-1761501,1761550,1761553,1761572,1761574,1761625-1761626,1761628,1761682,1761740,1761752,1762051-176205
 3,1762123,1762168,1762172,1762182,1762201-1762202,1762204,1762208,1762288,1762296,1762324,1762348,1762353,1762362,1762374,1762492,1762503,1762505,1762541,1762608,1762710,1762753,1762766,1762769,1762944,1762947,1762953,1763167,1763179,1763232,1763259,1763271-1763272,1763276-1763277,1763319-1763320,1763370,1763372,1763375,1763377,1763393,1763412,1763430,1763450,1763462,1763505,1763511-1763512,1763516,1763518,1763520,1763529,1763559,1763565,1763568,1763574,1763619,1763634-1763635,1763718,1763748,1763786,1763798-1763799,1763810,1763813,1763815,1763819,1763831,1764083,1764425,1764646,1764648-1764649,1764659,1764663,1764682,1764862,1764866-1764867,1764870,1764897,1765133,1765299,1765358,1765439,1765447,1765495,1765502,1765569-1765571,1765579,1765582,1765589-1765590,1765794,1765801,1765813,1765815,1766276,1766514,1766533,1766535,1766664,1766675,1766698,1766700,1766822,1766834,1766840,1767047,1767328,1767362,1767368,1767429,1767471,1767505,1767641-1767644,1767903,1767945-1767946,1768123,176
 8283,1768520,1768569,1768651,1768762,1768922,1769191,1769263,1769630,1769833,1769975,1770047,1770140,1770180,1770258,1770389,1770656,1770666,1770718,1770762,1770952,1770954,1770956,1770961,1771087,1771126,1771139,1771143,1771149,1771156,1771266,1771316,1771386,1771611,1771613,1771711,1771718,1771723-1771724,1771730,1771743,1771752,1771853,1771963,1772170,1772174,1772223,1772229,1772318-1772319,1772353,1772355,1772554,1772603-1772609,1772849,1772865,1772870,1772872,1772875-1772876,1772881,1772886,1772947,1773306,1773344,1773418,1773756,1773813-1773814,1774052,1774102,1774131,1774161,1774164,1774248,1774253,1774257,1774259,1774262,1774267,1774271,1774303,1774340,1774406,1774412,1774426,1774433,1774522-1774523,1774526,1774528-1774529,1774531,1774732-1774736,1774738-1774739,1774741-1774742,1774749,1774755,1774789,1774858,1774867,1775596,1775985-1775986,1776540,1776937,1776954,1777011,1777173,1777189,1777211,1777524,1777546,1777605,1777619,1777647,1777721-1777722,1777967,1778061,1778138-
 1778139,1778141-1778150,1778154,1778275-1778276,1778295,1778342,1778348,1778404,1778424,1778426,1778575,1778582,1778600,1778603,1779312,1779370,1779545,1779612,1779622,1779641,1779654,1779708,1779718,1779897,1779899,1779932,1780109,1780120,1780189,1780196,1780488,1780514-1780516,1780601,1780606,1780609-1780610,1780652,1780991,1780995-1780996,1781174,1781569,1781975,1781986,1782116,1782383-1782384,1782566,1782572,1782775,1782779,1782814,1782857,1782868,1782934,1782946-1782947,1782956,1783144-1783147,1783155,1783408,1784182,1784565,1784583,1784657,1784669,1784712,1784723,1784751,1784767,1784806,1784818,1784911,1784926,1784956,1784963,1785032,1785037,1785245,1785271,1785310,1785317,1785643,1785667,1785762,1785774,1785823,1785935,1786051,1786070,1786123-1786124,1786127,1786129,1786341,1786378,1786844,1787200,1787250,1787405,1787701,1787703,1787938,1787959,1787973,1788223-1788224,1788228,1788232,1788241-1788242,1788248,1788323,1788328,1788455,1788460,1788473,1788543-1788544,1788548,17885
 50,1788554,1788558,1788560,1788567,1788569,1788572,1788647,1788732,1788741,1788747,1788753,1788764,1788771,1788834,1788841,1788852,1788860,1788883,1788890,1789051,1789400,1789415,1789442-1789443,1789447,1789453,1789456,1789458,1789461-1789463,1789465-1789467,1789470,1789472,1789474,1789476,1789479-1789480,1789733,1789735,1789744-1789745,1789937,1789984,1790119,1790180,1790183,1790213,1790376,1790443,1790614,1790983,1790991,1791027-1791028,1791050,1791090,1791095-1791096,1791099,1791101-1791103,1791124,1791129,1791134,1791137,1791298,1791527,1791557,1791970,1792033,1792038,1792055,1792093,1792140,1792460,1792468,1792791,1792957,1793095,1793121,1793123,1793127,1793136,1793139,1793147-1793148,1793266,1793437,1793449,1793460,1793468,1793487,1793498,1793502,1793514,1793682-1793683,1793711-1793712,1793716,1793719,1793736,1793746,1793758,1793771,1793776,1793798,1793802,1793812,1793819,1793844,1793854,1793887,1793891,1793898,1793901-1793902,1793907,1793910,1793980,1794674,1794941-1794942,17
 95278,1795289,1795298,1795305,1795813,1795893,1796090,1796275,1796693-1796695,1796729,1796806,1796836,1796873,1796878,1797197,1797338,1797344,1797354-1797355,1797516,1797528,1797532,1797536,1797540,1797543,1797677-1797678,1797692,1797694,1797748,1797828,1798126,1798238,1798280,1798371,1798379,1798384,1798390,1798395,1798419,1798505,1798507,1798509,1798533,1798546,1798561,1798977,1799115,1799126,1799164,1799190,1799194,1799216,1799231,1799250,1799253,1799285,1799368,1799412,1799498,1799514-1799515,1799677,1799701-1799702,1799704,1799709,1799885,1799893,1799895,1799916,1800136-1800138,1800202,1800309,1800390,1800617,1800629,1800791,1800816,1800850,1800864,1800867,1800874,1800885,1800980-1800981,1800984,1800988,1800992,1801195,1801686,1801688,1801709,1801717,1801774,1801778,1802083,1802195,1802204-1802205,1802210,1802225-1802226,1802229,1802403,1802475,1802490,1802788,1802796,1802803,1802820,1802828,1802833,1802836,1803030,1803038,1803055,1803135,1803165,1803174,1803193,1803205,1803224
 ,1803278,1803281,1803295,1803297,1803446,1803451,1803456,1803459,1803616,1803636,1803828,1803901,1803972,1804040,1804094,1804306,1804461-1804463,1804501,1804506-1804507,1804754,1804813,1804888,1804890,1804903-1804908,1804915,1804917,1805523-1805530,1805550,1805612-1805613,1805637,1805645,1805652,1805726,1805752,1805782,1805826,1806307,1806356,1806445,1806736,1806794,1806798,1806801,1806807,1806873,1806966,1806973,1807004,1807093,1807135,1807205-1807206,1807237,1807242,1807251,1807282,1807455,1807686,1807698,1807713,1807715,1807729,1807742,1807747,1807751,1807755,1808116,1808156,1808266,1808433,1808438-1808439,1808466,1808481-1808482,1808695,1808701,1808766,1809011,1809025,1809141,1809143-1809144,1809146,1809158,1809212,1809214,1809239,1809248,1809263,1809265,1809317,1809434,1809669,1809671,1809674,1809684,1809711,1809828,1809830,1809908-1809909,1809922,1810106,1810110,1810280,1810300,1811031,1811119,1811122,1811132,1811137,1811139,1811174,1811176,1811198-1811201,1811203-1811206,1811
 220,1811235,1811246,1811327-1811329,1811350,1811560,1811704,1811837-1811839,1811861,1811932,1812087-1812088,1812092,1812094,1812103,1812107,1812113,1812129,1812134-1812136,1812184,1812315,1812401,1812489,1812513,1812617,1813919,1814192,1814195,1814567,1814825,1814973,1814980,1815066,1815069,1815208,1815215,1815318-1815319,1815325,1815385,1815429,1815441-1815442,1815451,1815459,1815465,1815505,1815615,1815793,1815800,1815802,1815806,1815826,1815829,1815834,1815840,1815903,1815944,1815954,1816076,1816078,1816083,1816087,1816120,1816128,1816140,1816147,1816157,1816338,1816431,1816443,1816538,1816541,1816545,1816549-1816550,1816563,1816570,1816647,1816695-1816704,1816716,1816780,1816887,1817089,1817092,1817096,1817104,1817126,1817136-1817137,1817196,1817223,1817298,1817305,1817495,1817517,1817520,1817965,1817997,1817999-1818001,1818004,1818179,1818184,1818438,1818711,1818919,1818976,1819054,1819057,1819061,1819063,1819068,1819070-1819071,1819074,1819077,1819148,1819903,1820003,1820005,1
 820138,1820153,1820194,1820196-1820197,1820202,1820206,1820222,1820265,1820272,1820276,1820279,1820281,1820302,1820634,1820701,1820705,1820932,1820981,1820994,1821157,1821167,1821197-1821203,1821225,1821234-1821235,1821251-1821252,1821293,1821328,1821381,1821490,1821708,1821932,1822001,1822016,1822109,1822111,1822116,1822150,1822232,1822524,1822945-1822946,1823006-1823007,1823102,1823111,1823150,1823161,1823262,1823306,1823310,1823337,1823481,1823483,1823492,1823495,1823540,1823620,1824154,1824201,1824228,1824254,1824263,1824297,1824301,1824311,1824323,1824357,1824766,1824774,1824892,1824901,1824959,1825054,1825516,1825519,1825713,1825738,1825872,1825909,1825943,1825987,1826048,1826111,1826115,1826209,1826361,1826375,1826688,1826731,1826794,1826812,1826817,1826825,1826867,1826869,1826958,1826975,1826977,1826979,1826985-1826986,1827150,1827203-1827204,1827223,1827297,1827299,1827363,1827368,1827396,1827408,1827428,1827479,1827491,1827498,1827860

Modified: tomcat/tc8.5.x/trunk/build.xml
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/build.xml?rev=1827981&r1=1827980&r2=1827981&view=diff
==============================================================================
--- tomcat/tc8.5.x/trunk/build.xml (original)
+++ tomcat/tc8.5.x/trunk/build.xml Thu Mar 29 12:11:49 2018
@@ -1435,8 +1435,8 @@
       <junit printsummary="yes" fork="yes" dir="." showoutput="${test.verbose}"
         errorproperty="test.result.error"
         failureproperty="test.result.failure"
-        haltonfailure="${test.haltonfailure}"
-        threads="${test.threads}" >
+        haltonfailure="${test.haltonfailure}">
+        <!-- threads="${test.threads}" > -->
 
         <jvmarg value="${test.jvmarg.egd}"/>
         <jvmarg value="-Dfile.encoding=UTF-8"/>

Copied: tomcat/tc8.5.x/trunk/java/org/apache/catalina/valves/LoadBalancerDrainingValve.java
(from r1799498, tomcat/trunk/java/org/apache/catalina/valves/LoadBalancerDrainingValve.java)
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/java/org/apache/catalina/valves/LoadBalancerDrainingValve.java?p2=tomcat/tc8.5.x/trunk/java/org/apache/catalina/valves/LoadBalancerDrainingValve.java&p1=tomcat/trunk/java/org/apache/catalina/valves/LoadBalancerDrainingValve.java&r1=1799498&r2=1827981&rev=1827981&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/valves/LoadBalancerDrainingValve.java (original)
+++ tomcat/tc8.5.x/trunk/java/org/apache/catalina/valves/LoadBalancerDrainingValve.java Thu
Mar 29 12:11:49 2018
@@ -22,11 +22,9 @@ import javax.servlet.ServletException;
 import javax.servlet.http.Cookie;
 import javax.servlet.http.HttpServletResponse;
 
-import org.apache.catalina.LifecycleException;
 import org.apache.catalina.connector.Request;
 import org.apache.catalina.connector.Response;
 import org.apache.catalina.util.SessionConfig;
-import org.apache.juli.logging.Log;
 
 /**
  * <p>A Valve to detect situations where a load-balanced node receiving a
@@ -58,7 +56,8 @@ import org.apache.juli.logging.Log;
  * authentication valves, as the redirection should take place before an
  * authentication valve would save a request to a protected resource.</p>
  *
- * @see http://tomcat.apache.org/connectors-doc/generic_howto/loadbalancers.html
+ * @see <a href="http://tomcat.apache.org/connectors-doc/generic_howto/loadbalancers.html">Load
+ *      balancer documentation</a>
  */
 public class LoadBalancerDrainingValve
     extends ValveBase
@@ -67,7 +66,7 @@ public class LoadBalancerDrainingValve
      * The request attribute key where the load-balancer's activation state
      * can be found.
      */
-    static final String ATTRIBUTE_KEY_JK_LB_ACTIVATION = "JK_LB_ACTIVATION";
+    public static final String ATTRIBUTE_KEY_JK_LB_ACTIVATION = "JK_LB_ACTIVATION";
 
     /**
      * The HTTP response code that will be used to redirect the request
@@ -96,13 +95,7 @@ public class LoadBalancerDrainingValve
      */
     private String _ignoreCookieValue;
 
-    /**
-     * Local reference to the container log.
-     */
-    protected Log containerLog = null;
-
-    public LoadBalancerDrainingValve()
-    {
+    public LoadBalancerDrainingValve() {
         super(true); // Supports async
     }
 
@@ -114,6 +107,8 @@ public class LoadBalancerDrainingValve
      * Sets the HTTP response code that will be used to redirect the request
      * back to the load-balancer for re-balancing. Defaults to 307
      * (TEMPORARY_REDIRECT).
+     *
+     * @param code The code to use for the redirect
      */
     public void setRedirectStatusCode(int code) {
         _redirectStatusCode = code;
@@ -179,15 +174,6 @@ public class LoadBalancerDrainingValve
     }
 
     @Override
-    public void initInternal()
-        throws LifecycleException
-    {
-        super.initInternal();
-
-        containerLog = getContainer().getLogger();
-    }
-
-    @Override
     public void invoke(Request request, Response response) throws IOException, ServletException
{
         if("DIS".equals(request.getAttribute(ATTRIBUTE_KEY_JK_LB_ACTIVATION))
            && !request.isRequestedSessionIdValid()) {
@@ -256,8 +242,7 @@ public class LoadBalancerDrainingValve
 
             // Re-write the URI if it contains a ;jsessionid parameter
             String uri = request.getRequestURI();
-            String sessionURIParamName = "jsessionid";
-            SessionConfig.getSessionUriParamName(request.getContext());
+            String sessionURIParamName = SessionConfig.getSessionUriParamName(request.getContext());
             if(uri.contains(";" + sessionURIParamName + "="))
                 uri = uri.replaceFirst(";" + sessionURIParamName + "=[^&?]*", "");
 

Copied: tomcat/tc8.5.x/trunk/test/org/apache/catalina/valves/TestLoadBalancerDrainingValve.java
(from r1799498, tomcat/trunk/test/org/apache/catalina/valves/TestLoadBalancerDrainingValve.java)
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/test/org/apache/catalina/valves/TestLoadBalancerDrainingValve.java?p2=tomcat/tc8.5.x/trunk/test/org/apache/catalina/valves/TestLoadBalancerDrainingValve.java&p1=tomcat/trunk/test/org/apache/catalina/valves/TestLoadBalancerDrainingValve.java&r1=1799498&r2=1827981&rev=1827981&view=diff
==============================================================================
--- tomcat/trunk/test/org/apache/catalina/valves/TestLoadBalancerDrainingValve.java (original)
+++ tomcat/tc8.5.x/trunk/test/org/apache/catalina/valves/TestLoadBalancerDrainingValve.java
Thu Mar 29 12:11:49 2018
@@ -44,9 +44,10 @@ public class TestLoadBalancerDrainingVal
         public void addCookie(Cookie cookie)
         {
             if(null == cookies)
-                cookies = new ArrayList<Cookie>(1);
+                cookies = new ArrayList<>(1);
             cookies.add(cookie);
         }
+        @Override
         public List<Cookie> getCookies() {
             return cookies;
         }
@@ -122,23 +123,37 @@ public class TestLoadBalancerDrainingVal
 
     // A Cookie subclass that knows how to compare itself to other Cookie objects
     static class MyCookie extends Cookie {
-      public MyCookie(String name, String value) { super(name, value); }
+        private static final long serialVersionUID = 1L;
+
+        public MyCookie(String name, String value) { super(name, value); }
+
+        @Override
+        public boolean equals(Object o) {
+            if(null == o) return false;
+            MyCookie mc = (MyCookie)o;
+
+            return mc.getName().equals(this.getName())
+                && mc.getPath().equals(this.getPath())
+                && mc.getValue().equals(this.getValue())
+                && mc.getMaxAge() == this.getMaxAge();
+        }
 
-      @Override 
-      public boolean equals(Object o) {
-        if(null == o) return false;
-        MyCookie mc = (MyCookie)o;
-
-        return mc.getName().equals(this.getName())
-            && mc.getPath().equals(this.getPath())
-            && mc.getValue().equals(this.getValue())
-            && mc.getMaxAge() == this.getMaxAge();
-      }
-
-      @Override
-      public String toString() {
-          return "Cookie { name=" + getName() + ", value=" + getValue() + ", path=" + getPath()
+ ", maxAge=" + getMaxAge() + " }";
-      }
+        @Override
+        public int hashCode() {
+            final int prime = 31;
+            int result = 1;
+            result = prime * result + getMaxAge();
+            result = prime * result + ((getName() == null) ? 0 : getName().hashCode());
+            result = prime * result + ((getPath() == null) ? 0 : getPath().hashCode());
+            result = prime * result + ((getValue() == null) ? 0 : getValue().hashCode());
+            return result;
+        }
+
+
+        @Override
+        public String toString() {
+            return "Cookie { name=" + getName() + ", value=" + getValue() + ", path=" + getPath()
+ ", maxAge=" + getMaxAge() + " }";
+        }
     }
 
     @Test
@@ -190,9 +205,9 @@ public class TestLoadBalancerDrainingVal
 
         // Set up the actual test
         EasyMock.expect(request.getAttribute(LoadBalancerDrainingValve.ATTRIBUTE_KEY_JK_LB_ACTIVATION)).andStubReturn(jkActivation);
-        EasyMock.expect(request.isRequestedSessionIdValid()).andStubReturn(validSessionId);
+        EasyMock.expect(Boolean.valueOf(request.isRequestedSessionIdValid())).andStubReturn(Boolean.valueOf(validSessionId));
 
-        ArrayList<Cookie> cookies = new ArrayList<Cookie>();
+        ArrayList<Cookie> cookies = new ArrayList<>();
         if(enableIgnore) {
             cookies.add(new Cookie("ignore", "true"));
         }
@@ -210,7 +225,7 @@ public class TestLoadBalancerDrainingVal
             EasyMock.expect(servletContext.getSessionCookieConfig()).andStubReturn(cookieConfig);
             EasyMock.expect(request.getServletContext()).andStubReturn(servletContext);
             EasyMock.expect(request.getContext()).andStubReturn(ctx);
-            EasyMock.expect(ctx.getSessionCookiePathUsesTrailingSlash()).andStubReturn(true);
+            EasyMock.expect(Boolean.valueOf(ctx.getSessionCookiePathUsesTrailingSlash())).andStubReturn(Boolean.TRUE);
             EasyMock.expect(servletContext.getSessionCookieConfig()).andStubReturn(cookieConfig);
             EasyMock.expect(request.getQueryString()).andStubReturn(queryString);
 

Modified: tomcat/tc8.5.x/trunk/webapps/docs/changelog.xml
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/webapps/docs/changelog.xml?rev=1827981&r1=1827980&r2=1827981&view=diff
==============================================================================
--- tomcat/tc8.5.x/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/tc8.5.x/trunk/webapps/docs/changelog.xml Thu Mar 29 12:11:49 2018
@@ -80,6 +80,10 @@
         notified once of property changes on the associated naming resources.
         (markt)
       </fix>
+      <add>
+        Add LoadBalancerDrainingValve, a Valve designed to reduce the amount of
+        time required for a node to drain its authenticated users. (schultz)
+      </add>
     </changelog>
   </subsection>
   <subsection name="Coyote">

Modified: tomcat/tc8.5.x/trunk/webapps/docs/config/valve.xml
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/webapps/docs/config/valve.xml?rev=1827981&r1=1827980&r2=1827981&view=diff
==============================================================================
--- tomcat/tc8.5.x/trunk/webapps/docs/config/valve.xml (original)
+++ tomcat/tc8.5.x/trunk/webapps/docs/config/valve.xml Thu Mar 29 12:11:49 2018
@@ -713,6 +713,81 @@
 
 
 <section name="Proxies Support">
+  <subsection name="Load Balancer Draining Valve">
+    <subsection name="Introduction">
+      <p>
+        When using mod_jk or mod_proxy_ajp, the client's session id is used to
+        determine which back-end server will be used to serve the request. If the
+        target node is being "drained" (in mod_jk, this is the <i>DISABLED</i>
+        state; in mod_proxy_ajp, this is the <i>Drain (N)</i> state), requests
+        for expired sessions can actually cause the draining node to fail to
+        drain.
+      </p>
+      <p>
+        Unfortunately, AJP-based load-balancers cannot prove whether the
+        client-provided session id is valid or not and therefore will send any
+        requests for a session that appears to be targeted to that node to the
+        disabled (or "draining") node, causing the "draining" process to take
+        longer than necessary.
+      </p>
+      <p>
+        This Valve detects requests for invalid sessions, strips the session
+        information from the request, and redirects back to the same URL, where
+        the load-balancer should choose a different (active)  node to handle the
+        request. This will accelerate the "draining" process for the disabled
+        node(s).
+      </p>
+
+      <p>
+        The activation state of the node is sent by the load-balancer in the
+        request, so no state change on the node being disabled is necessary. Simply
+        configure this Valve in your valve pipeline and it will take action when
+        the activation state is set to "disabled".
+      </p>
+
+      <p>
+        You should take care to register this Valve earlier in the Valve pipeline
+        than any authentication Valves, because this Valve should be able to
+        redirect a request before any authentication Valve saves a request to a
+        protected resource. If this happens, a new session will be created and
+        the draining process will stall because a new, valid session will be
+        established.
+      </p>
+    </subsection><!-- / Introduction -->
+
+    <subsection name="Attributes">
+      <p>The <strong>Load Balancer Draining Valve</strong> supports the
+      following configuration attributes:</p>
+
+      <attributes>
+        <attribute name="className" required="true">
+          <p>Java class name of the implementation to use. This MUST be set to
+          <strong>org.apache.catalina.valves.LoadBalancerDrainingValve</strong>.
+          </p>
+        </attribute>
+
+        <attribute name="redirectStatusCode" required="false">
+          <p>Allows setting a custom redirect code to be used when the client
+          is redirected to be re-balanced by the load-balancer. The default is
+          307 TEMPORARY_REDIRECT.</p>
+        </attribute>
+
+        <attribute name="ignoreCookieName" required="false">
+          <p>When used with <code>ignoreCookieValue</code>, a client can
present
+          this cookie (and accompanying value) that will cause this Valve to
+          do nothing. This will allow you to probe your <i>disabled</i> node
+          before re-enabling it to make sure that it is working as expected.</p>
+        </attribute>
+
+        <attribute name="ignoreCookieValue" required="false">
+          <p>When used with <code>ignoreCookieName</code>, a client can
present
+          a cookie (and accompanying value) that will cause this Valve to
+          do nothing. This will allow you to probe your <i>disabled</i> node
+          before re-enabling it to make sure that it is working as expected.</p>
+        </attribute>
+      </attributes>
+    </subsection><!-- /Attributes -->
+  </subsection><!-- /Load Balancer Draining Valve -->
 
 <subsection name="Remote IP Valve">
 



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