Basic mode and HPEL mode

Two modes of logging and tracing exist in the product, which are basic mode and High Performance Extensible Logging (HPEL) mode. Use this topic to understand the differences between these modes.

Note: Esse tópico faz referência a um ou mais arquivos de log do servidor de aplicativos. Como uma recomendação alternativa, é possível configurar o servidor para usar a infraestrutura de log e rastreio do High Performance Extensible Logging (HPEL) em vez de usar os arquivos SystemOut.log , SystemErr.log, trace.log e activity.log em sistemas distribuídos e IBM® i. Também é possível usar HPEL em conjunção com os recursos de criação de log z/OS® nativos. Se você estiver usando HPEL, será possível acessar todas as informações de log e rastreio usando a ferramenta de linha de comandos LogViewer a partir do diretório bin do perfil do servidor. Consulte as informações sobre a utilização do HPEL para resolução de problemas dos aplicativos para obter mais informações sobre o uso do HPEL.

Basic mode, the default mode, is the existing log and trace framework from prior releases of WebSphere® Application Server. Any existing scripts and tools you have that use logs and trace might need minor modifications to work with HPEL mode.

To take advantage of the new log and trace framework, HPEL mode must be enabled. Once HPEL mode is enabled the JVM logs (typically SystemOut.log and SystemErr.log), the trace log (typically trace.log), and the service log (typically activity.log) are no longer written to. Instead, log and trace content is written to a log data or trace data repository in a proprietary binary format and, if configured, to a text log file. Disabling the writing of the text log file results in the largest possible performance benefit of HPEL. A log viewing tool, LogViewer, is provided to allow for viewing, filtering, monitoring, and formatting the log and trace data in the repositories.

The following figure shows the files used by the basic mode and HPEL mode log and trace facilities. When enabled, the HPEL text log file stores content from Java™ trace (optional), Java logs, System.out, and System.err. You can disable the HPEL text log in cases where it is not needed as indicated by the dotted lines.
Figure 1. Log and trace filesBasic mode and HPEL mode event storage.
Table 1. Basic mode and HPEL mode files. This table shows where each of the application and application server log, trace, JVM log, and native JVM log content is routed and how to view that content.
Source Basic mode files HPEL mode files How to view the HPEL files
System.out SystemOut.log

trace.log (when trace enabled)

logdata/*.wbl

TextLog_<timestamp>.log (when text log enabled)

logdata - use LogViewer, with optional filtering, to render log data repository as readable text, then use any text editor

TextLog - any text editor

System.err SystemErr.log Same as System.out Same as System.out
java.util.logging (levels DETAIL and above) SystemOut.log

activity.log

trace.log (when trace enabled)

Same as System.out Same as System.out
java.util.logging (levels below DETAIL) trace.log tracedata/*.wbl

TextLog_<timestamp>.log (when text log enabled)

tracedata - use LogViewer, with optional filtering, to render trace data repository as readable text, then use any text editor

TextLog - any text editor

native cout native_stdout.log native_stdout.log Any text editor
native cerr native_stderr.log native_stderr.log Any text editor
The following table describes the MBean services:
Table 2. Basic mode and HPEL mode MBeans. This table shows the JMX MBeans that are associated with the basic mode and HPEL mode log and trace frameworks.
Basic mode MBeans HPEL mode MBeans HPEL MBean Descriptions
RasLoggingServiceMBean RasLoggingServiceMBean Provides JMX Notification
  HPELLogDataServiceMBean Configures the log repository such as location, retention policy, out of space behavior, buffering, and file switching
  HPELTraceDataServiceMBean Configures the trace repository such as location, retention policy, out of space behavior, buffering, and file switching
  HPELTextLogServiceMBean Configures the text log such as location, retention policy, out of space behavior, buffering, file switching, and SystemErr or SystemOut format
TraceServiceMBean HPELControlServiceMBean Configures trace specification levels, and provides access to log and trace repository content

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