| <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference (6.0.39) - The Cluster Receiver object</title><meta name="author" content="Filip Hanik"><style type="text/css" media="print"> | |
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| <ul><li><a href="#Introduction">Introduction</a></li><li><a href="#Blocking_vs_Non-Blocking_Receiver">Blocking vs Non-Blocking Receiver</a></li><li><a href="#Attributes">Attributes</a><ol><li><a href="#Common_Attributes">Common Attributes</a></li><li><a href="#NioReceiver">NioReceiver</a></li><li><a href="#BioReceiver">BioReceiver</a></li></ol></li></ul> | |
| </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote> | |
| <p> | |
| The receiver component is responsible for receiving cluster messages. | |
| As you might notice through the configuration, is that the receiving of messages | |
| and sending of messages are two different components, this is different from many other | |
| frameworks, but there is a good reason for it, to decouple the logic for how messages are sent from | |
| how messages are received.<br> | |
| The receiver is very much like the Tomcat Connector, its the base of the thread pool | |
| for incoming cluster messages. The receiver is straight forward, but all the socket settings | |
| for incoming traffic are managed here. | |
| </p> | |
| </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Blocking vs Non-Blocking Receiver"><!--()--></a><a name="Blocking_vs_Non-Blocking_Receiver"><strong>Blocking vs Non-Blocking Receiver</strong></a></font></td></tr><tr><td><blockquote> | |
| <p> | |
| The receiver supports both a non blocking, <code>org.apache.catalina.tribes.transport.nio.NioReceiver</code>, and a | |
| blocking, <code>org.apache.catalina.tribes.transport.bio.BioReceiver</code>. It is preferred to use the non blocking receiver | |
| to be able to grow your cluster without running into thread starvation.<br> | |
| Using the non blocking receiver allows you to with a very limited thread count to serve a large number of messages. | |
| Usually the rule is to use 1 thread per node in the cluster for small clusters, and then depending on your message frequency | |
| and your hardware, you'll find an optimal number of threads peak out at a certain number. | |
| </p> | |
| </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote> | |
| <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Common Attributes"><!--()--></a><a name="Common_Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote> | |
| <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code>className</code></strong></td><td align="left" valign="center"> | |
| The implementation of the receiver component. Two implementations available, | |
| <code>org.apache.catalina.tribes.transport.nio.NioReceiver</code> and | |
| <code>org.apache.catalina.tribes.transport.bio.BioReceiver</code>.<br> | |
| The <code>org.apache.catalina.tribes.transport.nio.NioReceiver</code> is the | |
| preferred implementation | |
| </td></tr><tr><td align="left" valign="center"><code>address</code></td><td align="left" valign="center"> | |
| The address (network interface) to listen for incoming traffic. | |
| Same as the bind address. The default value is <code>auto</code> and translates to | |
| <code>java.net.InetAddress.getLocalHost().getHostAddress()</code>. | |
| </td></tr><tr><td align="left" valign="center"><code>direct</code></td><td align="left" valign="center"> | |
| Possible values are <code>true</code> or <code>false</code>. | |
| Set to true if you want the receiver to use direct bytebuffers when reading data | |
| from the sockets. | |
| </td></tr><tr><td align="left" valign="center"><code>port</code></td><td align="left" valign="center"> | |
| The listen port for incoming data. The default value is <code>4000</code>. | |
| To avoid port conflicts the receiver will automatically bind to a free port within the range of | |
| <code> port <= bindPort <= port+autoBind</code> | |
| So for example, if port is 4000, and autoBind is set to 10, then the receiver will open up | |
| a server socket on the first available port in the range 4000-4100. | |
| </td></tr><tr><td align="left" valign="center"><code>autoBind</code></td><td align="left" valign="center"> | |
| Default value is <code>100</code>. | |
| Use this value if you wish to automatically avoid port conflicts the cluster receiver will try to open a | |
| server socket on the <code>port</code> attribute port, and then work up <code>autoBind</code> number of times. | |
| </td></tr><tr><td align="left" valign="center"><code>securePort</code></td><td align="left" valign="center"> | |
| The secure listen port. This port is SSL enabled. If this attribute is omitted no SSL port is opened up. | |
| There default value is unset, meaning there is no SSL socket available. | |
| </td></tr><tr><td align="left" valign="center"><code>selectorTimeout</code></td><td align="left" valign="center"> | |
| The value in milliseconds for the polling timeout in the <code>NioReceiver</code>. On older versions of the JDK | |
| there have been bugs, that should all now be cleared out where the selector never woke up. | |
| The default value is a very high <code>5000</code> milliseconds. | |
| </td></tr><tr><td align="left" valign="center"><code>maxThreads</code></td><td align="left" valign="center"> | |
| The maximum number of threads in the receiver thread pool. The default value is <code>6</code> | |
| Adjust this value relative to the number of nodes in the cluster, the number of messages being exchanged and | |
| the hardware you are running on. A higher value doesn't mean more efficiency, tune this value according to your | |
| own test results. | |
| </td></tr><tr><td align="left" valign="center"><code>minThreads</code></td><td align="left" valign="center"> | |
| Minimum number of threads to be created when the receiver is started up. Default value is <code>6</code> | |
| </td></tr><tr><td align="left" valign="center"><code>ooBInline</code></td><td align="left" valign="center"> | |
| Boolean value for the socket OOBINLINE option. Possible values are <code>true</code> or <code>false</code>. | |
| </td></tr><tr><td align="left" valign="center"><code>rxBufSize</code></td><td align="left" valign="center"> | |
| The receiver buffer size on the receiving sockets. Value is in bytes, the default value is <code>43800</code> bytes. | |
| </td></tr><tr><td align="left" valign="center"><code>txBufSize</code></td><td align="left" valign="center"> | |
| The sending buffer size on the receiving sockets. Value is in bytes, the default value is <code>25188</code> bytes. | |
| </td></tr><tr><td align="left" valign="center"><code>soKeepAlive</code></td><td align="left" valign="center"> | |
| Boolean value for the socket SO_KEEPALIVE option. Possible values are <code>true</code> or <code>false</code>. | |
| </td></tr><tr><td align="left" valign="center"><code>soLingerOn</code></td><td align="left" valign="center"> | |
| Boolean value to determine whether to use the SO_LINGER socket option. | |
| Possible values are <code>true</code> or <code>false</code>. Default value is <code>true</code>. | |
| </td></tr><tr><td align="left" valign="center"><code>soLingerTime</code></td><td align="left" valign="center"> | |
| Sets the SO_LINGER socket option time value. The value is in seconds. | |
| The default value is <code>3</code> seconds. | |
| </td></tr><tr><td align="left" valign="center"><code>soReuseAddress</code></td><td align="left" valign="center"> | |
| Boolean value for the socket SO_REUSEADDR option. Possible values are <code>true</code> or <code>false</code>. | |
| </td></tr><tr><td align="left" valign="center"><code>soTrafficClass</code></td><td align="left" valign="center"> | |
| Sets the traffic class level for the socket, the value is between 0 and 255. | |
| Different values are defined in <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/net/Socket.html#setTrafficClass(int)"> | |
| java.net.Socket#setTrafficClass(int)</a>. | |
| </td></tr><tr><td align="left" valign="center"><code>tcpNoDelay</code></td><td align="left" valign="center"> | |
| Boolean value for the socket TCP_NODELAY option. Possible values are <code>true</code> or <code>false</code>. | |
| The default value is <code>true</code> | |
| </td></tr><tr><td align="left" valign="center"><code>timeout</code></td><td align="left" valign="center"> | |
| Sets the SO_TIMEOUT option on the socket. The value is in milliseconds and the default value is <code>3000</code> | |
| milliseconds. | |
| </td></tr><tr><td align="left" valign="center"><code>useBufferPool</code></td><td align="left" valign="center"> | |
| Boolean value whether to use a shared buffer pool of cached <code>org.apache.catalina.tribes.io.XByteBuffer</code> | |
| objects. If set to true, the XByteBuffer that is used to pass a message up the channel, will be recycled at the end | |
| of the requests. This means that interceptors in the channel must not maintain a reference to the object | |
| after the <code>org.apache.catalina.tribes.ChannelInterceptor#messageReceived</code> method has exited. | |
| </td></tr></table> | |
| </blockquote></td></tr></table> | |
| <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="NioReceiver"><strong>NioReceiver</strong></a></font></td></tr><tr><td><blockquote> | |
| </blockquote></td></tr></table> | |
| <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="BioReceiver"><strong>BioReceiver</strong></a></font></td></tr><tr><td><blockquote> | |
| </blockquote></td></tr></table> | |
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