Logstash Configuration Description

The data collector Logstash for tenant-side collection is customized by SecMaster. In different transmission scenarios, you can adjust parameter settings to obtain an optimal performance. This topic mainly covers how to tune log4j2.properties and jvm.options.

JVM Running Memory Configuration

**Table 1** JVM running memory configuration
Parameter	Configuration Type	Default Value	Description
-Djava.awt.headless	boolean	true	Server side configuration. If it is set to "true", you can run an application in headless mode (without a keyboard or display). This parameter is used for data related services.
-XX:+UseConcMarkSweepGC	boolean	false	Concurrent Mark Sweep (CMS) garbage collector for the old generation.
-Xmn	String	1024M	The size of the heap for the young generation. If the collection pressure is high, adjust this value. The larger the heap size for the young generation, the smaller the number of garbage collection times, and the higher the collection efficiency. Xmn must be smaller than Xmx.
-Xmx	String	2048M	The total (maximum) heap size. A proper Xmx can prevent JVM from using excessive system resources to keep the application available and stable. If this parameter is set to a very small value, the collector will start garbage collection over and over again. This will affect collector performance.
-Djruby.jit.threshold	number	0	The specified method invocation count. When this threshold is reached, the JIT compiler of JRuby attempts to compile the local code of the method. You can adjust this value to obtain an optimal balance between startup time (compilation cost) and execution time performance
-XX:CMSInitiatingOccupancyFraction	number	75	CMS garbage collector. When the old generation usage reaches 75%, CMS garbage collection is triggered.
-Xms	String	20248M	The initial Java heap size. When JVM starts, it attempts to allocate the specified amount of memory to the heap. A proper initial heap size will free you from frequent heap size adjustments while the application is running.

log4j2 log configuration

**Table 2** log4j2 log configuration
Parameter	Configuration Type	Default Value	Description
appender.json_console_slowlog.layout.compact	boolean	true	JSON slow query log output.
appender.json_console_slowlog.layout.type	String	JSONLayout	Layout type of JSON slow query logs. Retain the default value.
appender.json_console_slowlog.type	String	Console	Type of JSON slow query logs. Default value: Console. This means logs are directly displayed on the console.
appender.json_console_slowlog.layout.eventEol	boolean	true	JSON slow query log output.
appender.json_console_slowlog.name	String	json_console_slowlog	Name of the JSON slow query log. Retain the default value.