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https://issues.apache.org/jira/browse/LOG4J2-2867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ralph Goers resolved LOG4J2-2867.
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Fix Version/s: 2.14.0
Resolution: Fixed
> ContextDataProvider will cause concurrent threads blocking at the first
> logging time
> ------------------------------------------------------------------------------------
>
> Key: LOG4J2-2867
> URL: https://issues.apache.org/jira/browse/LOG4J2-2867
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.13.2, 2.13.3
> Environment: Java Version: 1.8.0_45
> Web Server: Tomcat 8.0.30
> OS: CentOS 6.8
> Reporter: Zishun Jiao
> Priority: Major
> Labels: performance
> Fix For: 2.14.0
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> The recently introduced `ContextDataProvider` use `ServiceLoader` to find
> all possible implementations of ContextDataProvider, which will try to scan
> all jar files. So when many new threads comes in the first logging time
> concurrently, all thread will be blocking on the` getProviders` method. It
> will make web service get very bad performance to serve requests in the
> beginning.
> Here is an example of blocking thread stack:
> at java.util.zip.ZipFile.getEntry (ZipFile.java:309)at
> java.util.zip.ZipFile.getEntry (ZipFile.java:309)at
> java.util.jar.JarFile.getEntry (JarFile.java:240)at
> java.util.jar.JarFile.getJarEntry (JarFile.java:223)at
> sun.misc.URLClassPath$JarLoader.getResource (URLClassPath.java:1005)at
> sun.misc.URLClassPath$JarLoader.findResource (URLClassPath.java:983)at
> sun.misc.URLClassPath$1.next (URLClassPath.java:240)at
> sun.misc.URLClassPath$1.hasMoreElements (URLClassPath.java:250)at
> java.net.URLClassLoader$3$1.run (URLClassLoader.java:601)at
> java.net.URLClassLoader$3$1.run (URLClassLoader.java:599)at
> java.security.AccessController.doPrivileged (Native Method)at
> java.net.URLClassLoader$3.next (URLClassLoader.java:598)at
> java.net.URLClassLoader$3.hasMoreElements (URLClassLoader.java:623)at
> sun.misc.CompoundEnumeration.next (CompoundEnumeration.java:45)at
> sun.misc.CompoundEnumeration.hasMoreElements (CompoundEnumeration.java:54)at
> sun.misc.CompoundEnumeration.next (CompoundEnumeration.java:45)at
> sun.misc.CompoundEnumeration.hasMoreElements (CompoundEnumeration.java:54)at
> java.util.ServiceLoader$LazyIterator.hasNextService
> (ServiceLoader.java:354)at java.util.ServiceLoader$LazyIterator.hasNext
> (ServiceLoader.java:393)at java.util.ServiceLoader$1.hasNext
> (ServiceLoader.java:474)at
> org.apache.logging.log4j.core.impl.ThreadContextDataInjector.getProviders
> (ThreadContextDataInjector.java:254)at
> org.apache.logging.log4j.core.impl.ThreadContextDataInjector.access$000
> (ThreadContextDataInjector.java:53)at
> org.apache.logging.log4j.core.impl.ThreadContextDataInjector$ForDefaultThreadContextMap.<init>
> (ThreadContextDataInjector.java:74)at
> org.apache.logging.log4j.core.impl.ContextDataInjectorFactory.createDefaultInjector
> (ContextDataInjectorFactory.java:91)at
> org.apache.logging.log4j.core.impl.ContextDataInjectorFactory.createInjector
> (ContextDataInjectorFactory.java:71)at
> org.apache.logging.log4j.core.async.RingBufferLogEventTranslator.<init>
> (RingBufferLogEventTranslator.java:40)at
> org.apache.logging.log4j.core.async.AsyncLogger.getCachedTranslator
> (AsyncLogger.java:121)at
> org.apache.logging.log4j.core.async.AsyncLogger.logWithThreadLocalTranslator
> (AsyncLogger.java:222)at
> org.apache.logging.log4j.core.async.AsyncLogger.access$000
> (AsyncLogger.java:67)at org.apache.logging.log4j.core.async.AsyncLogger$1.log
> (AsyncLogger.java:152)at org.apache.logging.log4j.core.async.AsyncLogger.log
> (AsyncLogger.java:136)at
> org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage
> (AbstractLogger.java:2198)at
> org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion
> (AbstractLogger.java:2152)at
> org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely
> (AbstractLogger.java:2135)at
> org.apache.logging.log4j.spi.AbstractLogger.logMessage
> (AbstractLogger.java:2011)at
> org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled
> (AbstractLogger.java:1983)at org.apache.logging.slf4j.Log4jLogger.warn
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