[jira] [Created] (SLING-7300) CPU spike in i18n job

["Ivo Leitão (JIRA)" <ji...@apache.org>]

Ivo Leitão created SLING-7300:
---------------------------------

             Summary: CPU spike in i18n job
                 Key: SLING-7300
                 URL: https://issues.apache.org/jira/browse/SLING-7300
             Project: Sling
          Issue Type: Bug
          Components: i18n, Karaf
    Affects Versions: i18n 2.5.10
         Environment: Linux, jdk1.8 latest version, Karaf 4.1.3
            Reporter: Ivo Leitão
            Priority: Critical
         Attachments: 1.tdump, 2.tdump, 3.tdump

Hi,

I'm experiencing severe CPU spikes caused by the reload job in the i18n bundle. I've uploaded 3 threadumps which I analysed in http://fastthread.io. The analysis identified a cpu spike in the method scheduleReloadBundles of the class https://github.com/apache/sling-org-apache-sling-i18n/blob/master/src/main/java/org/apache/sling/i18n/impl/JcrResourceBundleProvider.java.

This does not happen every time only on some situations. I've experienced this problem in previous i18n bundle versions. Since there was changes on the mentioned class I've updated it hopping to get rid of this problem. Unfortunately I'm experiencing it again :-(

Thread dump bellow:

sling-default-1-JcrResourceBundleProvider: reload all resource bundles - priority:5 - threadId:0x00007f2ec851e800 - nativeId:0x1f72 - state:RUNNABLE
stackTrace:
java.lang.Thread.State: RUNNABLE
at java.lang.ThreadLocal$ThreadLocalMap.getEntryAfterMiss(ThreadLocal.java:444)
at java.lang.ThreadLocal$ThreadLocalMap.getEntry(ThreadLocal.java:419)
at java.lang.ThreadLocal$ThreadLocalMap.access$000(ThreadLocal.java:298)
at java.lang.ThreadLocal.get(ThreadLocal.java:163)
at org.apache.logging.log4j.core.layout.StringBuilderEncoder.getByteBuffer(StringBuilderEncoder.java:115)
at org.apache.logging.log4j.core.layout.StringBuilderEncoder.encode(StringBuilderEncoder.java:54)
at org.apache.logging.log4j.core.layout.StringBuilderEncoder.encode(StringBuilderEncoder.java:32)
at org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:219)
at org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:57)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:177)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:170)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:161)
at org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender.append(RollingRandomAccessFileAppender.java:218)
at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:448)
at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:433)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:417)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:403)
at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
at org.ops4j.pax.logging.log4j2.internal.PaxLoggerImpl.doLog0(PaxLoggerImpl.java:151)
at org.ops4j.pax.logging.log4j2.internal.PaxLoggerImpl.doLog(PaxLoggerImpl.java:144)
at org.ops4j.pax.logging.log4j2.internal.PaxLoggerImpl.inform(PaxLoggerImpl.java:176)
at org.ops4j.pax.logging.internal.TrackingLogger.inform(TrackingLogger.java:86)
at org.ops4j.pax.logging.slf4j.Slf4jLogger.info(Slf4jLogger.java:476)
at org.apache.sling.i18n.impl.JcrResourceBundleProvider$1.run(JcrResourceBundleProvider.java:319)
at org.apache.sling.commons.scheduler.impl.QuartzJobExecutor.execute(QuartzJobExecutor.java:347)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Locked ownable synchronizers:
- <0x00000000e6d47830> (a java.util.concurrent.ThreadPoolExecutor$Worker)



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