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| <title>Limiting Load</title><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"><meta name="keywords" content="jetty, servlet, servlet-api, cometd, http, spdy, websocket, eclipse, maven, java, server, software"><link rel="home" href="index.html" title="Jetty : The Definitive Reference"><link rel="up" href="optimizing.html" title="Chapter 20. Optimizing Jetty"><link rel="prev" href="high-load.html" title="High Load"><link rel="next" href="configuring-logging.html" title="Chapter 21. Jetty Logging"><link xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" rel="shortcut icon" href="images/favicon.ico"><script type="text/javascript" src="js/shCore.js"></script><script type="text/javascript" src="js/shBrushJava.js"></script><script type="text/javascript" src="js/shBrushXml.js"></script><script type="text/javascript" src="js/shBrushBash.js"></script><script type="text/javascript" src="js/shBrushJScript.js"></script><script type="text/javascript" src="js/shBrushSql.js"></script><script type="text/javascript" src="js/shBrushProperties.js"></script><script type="text/javascript" src="js/shBrushPlain.js"></script><link type="text/css" rel="stylesheet" href="css/shCore.css"><link type="text/css" rel="stylesheet" href="css/shThemeEclipse.css"><link type="text/css" rel="stylesheet" href="css/font-awesome.min.css"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><tr><td style="width: 25%"><a href="http://www.eclipse.org/jetty"><img src="images/jetty-header-logo.png" alt="Jetty Logo"></a><br><span style="font-size: small"> |
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| private support for your internal/customer projects ... custom extensions and distributions ... versioned snapshots for indefinite support ... |
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| </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="limit-load"></a>Limiting Load</h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="limit-load.html#d0e14687">Low Resources Monitor</a></span></dt><dt><span class="section"><a href="limit-load.html#d0e14717">Denial Of Service Filter</a></span></dt></dl></div><p>To achieve optimal fair handling for all users of a server, it can be |
| necessary to limit the resources that each user/connection can utilize so as |
| to maximize throughput for the server or to ensure that the entire server |
| runs within the limitations of it's runtime</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="d0e14687"></a>Low Resources Monitor</h3></div></div></div><p>An instance of <a class="link" href="http://download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/server/LowResourcesMonitor.html" target="_top">LowResourcesMonitor</a> |
| may be added to a Jetty Server to monitor for low resources situations and |
| to take action to limit the number of idle connections on the server. To |
| configure the low resources monitor, you can uncomment the |
| jetty-lowresources.xml line from the start.ini configuration file, which |
| has the effect of including the following XML configuration:</p><script type="syntaxhighlighter" class="brush: xml;toolbar: false"> |
| <![CDATA[<?xml version="1.0"?> |
| <!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_0.dtd"> |
| |
| <!-- =============================================================== --> |
| <!-- Mixin the Low Resources Monitor --> |
| <!-- =============================================================== --> |
| |
| <Configure id="Server" class="org.eclipse.jetty.server.Server"> |
| <Call name="addBean"> |
| <Arg> |
| <New class="org.eclipse.jetty.server.LowResourceMonitor"> |
| <Arg name="server"><Ref refid='Server'/></Arg> |
| <Set name="period"><Property name="lowresources.period" default="1000"/></Set> |
| <Set name="lowResourcesIdleTimeout"><Property name="lowresources.lowResourcesIdleTimeout" default="200"/></Set> |
| <Set name="monitorThreads"><Property name="lowresources.monitorThreads" default="true"/></Set> |
| <Set name="maxConnections"><Property name="lowresources.maxConnections" default="0"/></Set> |
| <Set name="maxMemory"><Property name="lowresources.maxMemory" default="0"/></Set> |
| <Set name="maxLowResourcesTime"><Property name="lowresources.maxLowResourcesTime" default="5000"/></Set> |
| </New> |
| </Arg> |
| </Call> |
| </Configure> |
| ]]> |
| </script><p>The monitor is configured with a period in milliseconds at which it |
| will scan the server looking for a low resources condition, which may be |
| one of:</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>If monitorThreads is configured as true and a connectors |
| Executor is an instance of <a class="link" href="http://download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/util/thread/ThreadPool.html" target="_top">ThreadPool</a>, |
| then its isLowOnThreads() method is used to detect low |
| resources.</p></li><li class="listitem"><p>If maxConnections is configured to a number >0 then if the |
| total number of connections from all monitored connectors exceeds this |
| value, then low resources state is entered.</p></li><li class="listitem"><p>If the maxMemory field is configured to a number of bytes >0 |
| then if the JVMs total memory minus its idle memory exceeds this |
| value, then low resources state is entered.</p></li></ul></div><p>Once low resoureces state is detected, then the monitor will iterate |
| over all existing connections and set their IdleTimeout to its configured |
| lowResourcesIdleTimeout in milliseconds. This allows the idle time of |
| existing connections to be reduced so that the connection is quickly |
| closed if no further request are received.</p><p>If the low resources state persists longer than the time in |
| milliseconds configured for the maxLowResourcesTime field, the the |
| lowResourcesIdleTimeout is repeatedly applied so that new connections as |
| well as existing connections will be limited.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="d0e14717"></a>Denial Of Service Filter</h3></div></div></div><p>TBD (see <a class="link" href="http://wiki.eclipse.org/Jetty/Reference/DoSFilter" target="_top">DoSFilter</a>).</p></div></div><script type="text/javascript"> |
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