Payne Xu created LOG4J2-2490:
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Summary: thread blocked when logging numerous exception stack
Key: LOG4J2-2490
URL: https://issues.apache.org/jira/browse/LOG4J2-2490
Project: Log4j 2
Issue Type: Improvement
Components: Servers
Affects Versions: 2.7
Reporter: Payne Xu
many thread blocked when logging a lot of exception, I found the reason is a
java optimize to reflection.
{quote}The first 15 runs (by default) of your reflected method is called using
JNI; after that, bytecode is generated and calling that reflected method would
perform identically to calling that method directly in Java code.
{quote}
ThrowableProxy.toExtendedStackTrace, the method will load class, and get jar
package info, when it process a optimized reflected method, it will use
classloaders but never found the class such as
_sun.reflect.GeneratedMethodAccessor119, in this process_ it will try to load
class from jar file every time and spend so much cost. Worse, have a lock when
loadClass, when many threads run this method, thread blocked.
here is a article detailed this problem:
https://translate.google.com/translate?hl=en&sl=zh-CN&tl=en&u=https%3A%2F%2Fblog.fliaping.com%2Fa-high-concurrency-problem-of-log4j2%2F
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