Evite problemas com Logging, Cluster e Multi JVMs
Autor: Heslei | Publicado: 2013-01-21T09:48:00-08:00

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Devem-se tomar algumas precauções ao configurar o log4j em
aplicações que rodam em um cluster de servidores de aplicação.





A principal delas é separar os arquivos de log por servidor.&nbsp;





Por quê?&nbsp;





Quando se tem em uma mesma máquina mais de um servidor, ou
seja, mais de uma JVM haverá concorrência de escrita no arquivo. Basta sua
aplicação receber algumas requisições &nbsp;simultâneas
em servidores distintos para os sintomas abaixo serem notados:



·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Mensagens com horários desordenados



·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Mensagens corrompidas



·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Mensagens sobrepostas



·&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Mensagens perdidas





Evitar esses problemas é simples.





Solução 1 - Parametrização manual





Adicionar um parâmetro de JVM (VM argument) em cada servidor
que o identifique.

-DserverName=”server1”



No log4j modificar o nome/caminho do arquivo para utilizar o
parâmetro definido no servidor.

&lt;appender name="appender1" class="org.apache.log4j.DailyRollingFileAppender"&gt;



&lt;param name="File" value="/logs/webapp1/application-${serverName}.log"/&gt;







ou







&lt;appender name="appender1"
class="org.apache.log4j.DailyRollingFileAppender"&gt;



&lt;param name="File" value="/logs/webapp1/${serverName}/application.log"/&gt;



Solução 2 - Parametrização automática

Em clusters com muitos servidores a parametrização manual torna-se dificil manter. Automatizar esse processo não é complicado.

O exemplo abaixo foi desenvolvido para WebSphere, porém, pode ser utilizado como base tanto para ser genérico quanto para outros servidores específicos. 

Primeiro, cria-se um ServletContextListener que verifica a existência do parâmetro de JVM e caso não exista ele é adicionado. Esse listener deve ser executado primeiro pela aplicação.

package br.com.billcode.listener; 

import java.lang.reflect.Method;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class ServerNameListener implements ServletContextListener {&nbsp;&nbsp;&nbsp; private static final String SERVER_NAME_KEY = "SERVER_NAME_KEY";&nbsp;&nbsp;&nbsp; public void contextDestroyed(ServletContextEvent event) {&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; // Do nothing&nbsp;&nbsp;&nbsp; }&nbsp;&nbsp;&nbsp; public void contextInitialized(ServletContextEvent event) {&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; String serverNameArgument = event.getServletContext().getInitParameter(SERVER_NAME_KEY);&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; if (serverNameArgument == null){&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; return;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; String serverName = System.getProperty(serverNameArgument);&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; // Verifies if the parameter already exists&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; if(serverName != null){&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; return;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; serverName = generateServerName();&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; if(serverName == null){&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; return;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; System.setProperty(serverNameArgument, serverName);&nbsp;&nbsp;&nbsp; }&nbsp;&nbsp;&nbsp; /**&nbsp;&nbsp;&nbsp; &nbsp;* @return The WebSphere Server's display name.&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;*/&nbsp;&nbsp;&nbsp; private String generateServerName() {&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; String serverName = null;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; try {&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Class&lt;?&gt; serverNameClass = Class.forName("com.ibm.websphere.runtime.ServerName");&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Method method = serverNameClass.getMethod("getDisplayName", null);&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; serverName = (String) method.invoke(null, null);&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; } catch (Exception e) {&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; throw new RuntimeException(e);&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; return serverName;&nbsp;&nbsp;&nbsp; }}

Segundo, adiciona-se o listener ao web.xml.
&lt;listener&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;listener-class&gt;br.com.billcode.listener.ServerNameListener&lt;/listener-class
&lt;/listener&gt; 
&nbsp; 
Terceiro, para o parâmetro de JVM não ficar fixo na aplicação adiciona-se um ContextParam.
&lt;context-param&gt;
&nbsp;&nbsp; &lt;param-name&gt;SERVER_NAME_KEY&lt;/param-name&gt;&nbsp;&nbsp; &lt;param-value&gt;serverName&lt;/param-value&gt;
&lt;/context-param&gt;


Quarto, no log4j modificar o nome/caminho do arquivo para utilizar o
parâmetro definido como ContextParam no web.xml.

&lt;appender name="appender1" class="org.apache.log4j.DailyRollingFileAppender"&gt;



&lt;param name="File" value="/logs/webapp1/application-${serverName}.log"/&gt;







ou







&lt;appender name="appender1"
class="org.apache.log4j.DailyRollingFileAppender"&gt;



&lt;param name="File" value="/logs/webapp1/${serverName}/application.log"/&gt;

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