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authorhongbotian <hongbo.tianhongbo@huawei.com>2015-11-30 02:41:33 -0500
committerhongbotian <hongbo.tianhongbo@huawei.com>2015-11-30 02:43:36 -0500
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+<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>The Apache Tomcat Connector - News - 2008 News and Status</title><meta name="author" value="Apache Tomcat Connectors Project"><meta name="email" value="dev.AT.tomcat.DOT.apache.DOT.org"><link href="../style.css" type="text/css" rel="stylesheet"></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="4"><!--PAGE HEADER--><tr><td colspan="2"><!--TOMCAT LOGO--><a href="http://tomcat.apache.org/"><img src="../images/tomcat.gif" align="left" alt="Apache Tomcat" border="0"></a><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="http://www.apache.org/images/asf-logo.gif" align="right" alt="Apache Logo" border="0"></a></td></tr><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap="true"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li></ul><p><strong>Reference Guide</strong></p><ul><li><a href="../reference/workers.html">workers.properties</a></li><li><a href="../reference/uriworkermap.html">uriworkermap.properties</a></li><li><a href="../reference/status.html">Status Worker</a></li><li><a href="../reference/apache.html">Apache HTTP Server</a></li><li><a href="../reference/iis.html">IIS</a></li></ul><p><strong>Generic HowTo</strong></p><ul><li><a href="../generic_howto/quick.html">For the impatient</a></li><li><a href="../generic_howto/workers.html">All about workers</a></li><li><a href="../generic_howto/timeouts.html">Timeouts</a></li><li><a href="../generic_howto/loadbalancers.html">Load Balancing</a></li><li><a href="../generic_howto/proxy.html">Reverse Proxy</a></li></ul><p><strong>Webserver HowTo</strong></p><ul><li><a href="../webserver_howto/apache.html">Apache HTTP Server</a></li><li><a href="../webserver_howto/iis.html">IIS</a></li><li><a href="../webserver_howto/nes.html">Netscape/SunOne/Sun</a></li></ul><p><strong>AJP Protocol Reference</strong></p><ul><li><a href="../ajp/ajpv13a.html">AJPv13</a></li><li><a href="../ajp/ajpv13ext.html">AJPv13 Extension Proposal</a></li></ul><p><strong>Miscellaneous Documentation</strong></p><ul><li><a href="../miscellaneous/faq.html">Frequently asked questions</a></li><li><a href="../miscellaneous/changelog.html">Changelog</a></li><li><a href="http://issues.apache.org/bugzilla/buglist.cgi?query_format=advanced&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;product=Tomcat+Connectors&amp;long_desc_type=substring&amp;long_desc=&amp;bug_file_loc_type=allwordssubstr&amp;bug_file_loc=&amp;keywords_type=allwords&amp;keywords=&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;emailassigned_to1=1&amp;emailtype1=substring&amp;email1=&amp;emailassigned_to2=1&amp;emailreporter2=1&amp;emailcc2=1&amp;emailtype2=substring&amp;email2=&amp;bugidtype=include&amp;bug_id=&amp;votes=&amp;chfieldfrom=&amp;chfieldto=Now&amp;chfieldvalue=&amp;cmdtype=doit&amp;order=Reuse+same+sort+as+last+time&amp;field0-0-0=noop&amp;type0-0-0=noop&amp;value0-0-0=">Current Tomcat Connectors bugs</a></li><li><a href="../miscellaneous/doccontrib.html">Contribute documentation</a></li><li><a href="../miscellaneous/jkstatustasks.html">JK Status Ant Tasks</a></li><li><a href="../miscellaneous/reporttools.html">Reporting Tools</a></li><li><a href="http://tomcat.apache.org/connectors-doc-archive/jk2/index.html">Old JK/JK2 documentation</a></li></ul><p><strong>News</strong></p><ul><li><a href="../news/20110701.html">2011</a></li><li><a href="../news/20100101.html">2010</a></li><li><a href="../news/20090301.html">2009</a></li><li><a href="../news/20081001.html">2008</a></li><li><a href="../news/20070301.html">2007</a></li><li><a href="../news/20060101.html">2006</a></li><li><a href="../news/20050101.html">2005</a></li><li><a href="../news/20041100.html">2004</a></li></ul></td><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left"><table border="0" width="100%" cellspacing="4"><tr><td align="left" valign="top"><h1>The Apache Tomcat Connector - News</h1><h2>2008 News and Status</h2></td><td align="right" valign="top" nowrap="true"><small><a href="printer/20081001.html"><img src="../images/printer.gif" border="0" alt="Printer Friendly Version"><br>print-friendly<br>version
+ </a></small></td></tr></table><table border="0" cellspacing="0" cellpadding="2" width="100%"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="2008 News &amp; Status"><strong>2008 News &amp; Status</strong></a></font></td></tr><tr><td><blockquote>
+<br>
+<table border="0" cellspacing="0" cellpadding="2" width="100%"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="28 October - JK-1.2.27 released"><strong>28 October - JK-1.2.27 released</strong></a></font></td></tr><tr><td><blockquote>
+<a name="20081028.1"></a>
+<br>
+<p>The Apache Tomcat team is proud to announce the immediate availability
+of Tomcat Connectors 1.2.27. This is a stable release adding lots of new features
+and some bug fixes.
+</p><p>
+ Please see the <a href="../miscellaneous/changelog.html">ChangeLog</a> for a full list of changes.
+</p>
+<p>If you find any bugs while using this release, please fill in the
+<a href="https://issues.apache.org/bugzilla/enter_bug.cgi?product=Tomcat%20Connectors">Bugzilla</a>
+Bug Report.
+</p>
+<p>
+The most important new features in this version are:
+</p>
+<h3>Watchdog Thread for Periodic Tasks</h3>
+<p>
+The connector has to run some periodic tasks independant of
+request processing. Examples are probing or closing down idle backend
+connections, adjusting load numbers and recovering workers from error state.
+</p>
+<p>
+Before version 1.2.27 these tasks were done inside the request processing loop.
+When a new request came in and the task was due, the thread handling the
+request first executed the internal task and then handled the request.
+If there were no requests coming in, the tasks would not run. If any of
+the tasks took unexpectedly long, the response time of the request waiting
+for the finishing of the task went up.
+</p>
+<p>
+Starting with this release you can configure a separate watchdog thread inside
+the web server to run all those tasks independantly of request processing.
+This new feature is avaliable for the connector when used with Apache httpd 2.x
+or with Microsoft IIS. To keep the behaviour of the new version consistent
+with previous releases, this feature is turned off by default.
+You can activate the watchdog thread via
+<a href="../reference/apache.html"><b class="code">JkWatchdogInterval</b></a>
+for Apache or
+<a href="../reference/iis.html"><b class="code">watchdog_interval</b></a>
+for IIS.
+</p>
+<h3>Connection Probing</h3>
+<p>
+In previous releases connection probing (checking whether connections still work)
+could only be done immediately after a new connection was established and
+directly before sending each request. Since we now have the watchdog
+thread available, we also added a periodic probing option, which you
+can activate with the worker attribute
+<a href="../reference/workers.html"><b class="code">ping_mode</b></a>.
+This will also be useful as a protection against the infamous firewall
+idle connection drop.
+</p>
+<p>
+The older attributes <b class="code">connect_timeout</b> and <b class="code">prepost_timeout</b>
+still exist and work the same way they did in previous releases.
+Since there are now three different probing options, we recommend to migrate
+your configuration to the newer attributes <b class="code">ping_mode</b>,
+<b class="code">ping_timeout</b> and <b class="code">connection_ping_interval</b>.
+</p>
+<h3>Mount Extensions</h3>
+<p>
+Usually one defines workers and mounts for the connector.
+A worker defines a backend we want to talk to and the configuration parameters of the
+communication, connection pools etc. The mounts define which URIs we want to forward to
+which worker (so we also call a mount an URI map rule).
+In version 1.2.27 you can overwrite certain worker parameter per mount.
+</p>
+<p>
+One easy to understand example is reply timeouts. Until this release you had to specify
+a reply timeout for the whole worker. But reply times depend a lot on the type of
+request. So normally you want to define a general reply timeout and
+for some special URLs you need to relax the reply timeout, because you know those
+URLs take much longer to process (like e.g. reporting or other compute intensive tasks).
+</p>
+<p>
+Another possible case is the activation status. You might use a load balancer worker to
+forward requests to certain webapps in a farm of Tomcat nodes. If you wanted
+to update some webapp on one node, you previously had to stop forwarding requests for
+all webapps on this Tomcat node. What was not possible until now, was stopping forwarding
+requests restricted to the webapp and the node you wanted to update.
+</p>
+<p>
+Starting with this release, you can add so-called
+<a href="../reference/uriworkermap.html#Rule extensions">rule extensions</a>
+to your uriworkermap file to influence worker parameters per mount. This will
+work for all Apache versions and for IIS. Remember, that
+the uriworkermap file automatically gets reloaded after changes without web server
+restart.
+</p>
+<h3>Improved IIS support</h3>
+<p>
+We improved IIS support im various ways. It is now possible to use
+multiple IIS 6 application pools with the ISAPI redirector.
+</p>
+<p>
+Furthermore some improvements were added as compile time features.
+The most notable one is chunked encoding support, which was a major
+refactoring and is therefore still considered experimental. You can
+download binaries with and without chunked encoding support. In future
+versions, chunked encoding will likely be availabe in all builds.
+</p>
+<p>
+Another new feature is an elegant way of configuring error page redirects.
+All new features are documented on the documentation page about
+<a href="../reference/iis.html">configuring IIS</a>.
+</p>
+<h3>Enhanced Status Worker</h3>
+<p>
+The
+<a href="../reference/status.html">status worker</a>
+now can also manage and show statistics for AJP workers that
+are not part of a load balancer. Other improvements are the new <b class="code">dump</b>
+action, the integration of the new configuration attributes, showing average
+request and transfer rates since the last statistics reset and the ability to
+display only a single member of a load balancer.
+</p>
+<p>
+Unfortunately we had to change
+<a href="../reference/status.html#Data Parameters for the standard Update Action">some request parameters</a>
+used for the <b class="code">update</b> action of the status worker.
+</p>
+<h3>Miscellaneous Improvements</h3>
+<p>
+Further enhancements are:
+<ul>
+<li>
+Configurable session stickyness indicator: cookie name and URL path
+parameter name can be freely chosen instead of the servlet spec compliant
+<b class="code">JSESSIONID</b> and <b class="code">;jsessionid</b>.
+</li>
+<li>
+Automatically determining the size of the shared memory segment needed
+to accommodate all workers.
+</li>
+<li>
+New connection establishment timeout <b class="code">socket_connect_timeout</b>.
+</li>
+<li>
+New timeout <b class="code">connection_acquire_timeout</b> for acquiring a free connection from
+the pool.
+</li>
+<li>
+Improved retry handling by adjusting the meaning of the attribute <b class="code">retries</b> for
+AJP workers and for load balancers and by adding the new <b class="code">retry_interval</b>.
+</li>
+<li>
+Allowing the web server to provide error pages instead of Tomcat.
+</li>
+</ul>
+</p>
+</blockquote></td></tr></table>
+</blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em>
+ Copyright &copy; 1999-2011, Apache Software Foundation
+ </em></font></div></td></tr></table></body></html> \ No newline at end of file