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https://issues.apache.org/jira/browse/LOG4J2-2589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17268581#comment-17268581
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Stefan Wendelmann commented on LOG4J2-2589:
-------------------------------------------
Hi [~rgoers] i hope you are doing fine.
Since i had some other projects to manage and issues to fix,
i finally tested your approach and after plenty of time researching the
documents i got new issues.
I tested this with 2.14.0 and 2.13.3
I used the JDBC Appender in combination with the DynamicThresholdFilter and
tried out a normal Logger
and also the AsyncLogger.
In the JDBC Appender i also tried out the PoolingDriver and the
ConnectionFactory approach.
It turns out that the Threads are not started parallel because of Log4j2.
Using the AsyncLogger even made it worse since the Output said that the
Appender is not started and of 15.000 expected logs only 13.517 are in the DB.
To reproduce the issue i made a github repo see here:
https://github.com/stefanwendelmann/Log4j_JDBC_Test
!jdbc_logger_multithreading.gif!
> Potential Memory Leak
> ----------------------
>
> Key: LOG4J2-2589
> URL: https://issues.apache.org/jira/browse/LOG4J2-2589
> Project: Log4j 2
> Issue Type: Bug
> Components: API, Appenders, Configurators, Core
> Affects Versions: 2.11.2
> Environment: Windows 10
> openjdk version "1.8.0_202"
> OpenJDK Runtime Environment
> (AdoptOpenJDK)(build 1.8.0_202-b08)
> OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.202-b08, mixed mode)
> Reporter: Stefan Höltker
> Priority: Major
> Attachments: 2019-04-12 13_20_45-eclipse-workspace -
> C__Daten_analyse_ems_prd_20190409_java_pid11448.hprof - Ecli.png,
> jdbc_logger_multithreading.gif, screenshot-1.png, screenshot-2.png,
> screenshot-3.png
>
>
> We moved our application from a own small logging component to Log4j2.
> The application runs about 60.000 jobs per day at our biggest installation.
> We write our own Appender wich writes wit Hibernate to our DB (see
> InnovaIntegrationsportalHibernateAppender).
> After a runtime of ~36h the JVM crashed with OOME, analysing the hprof i saw
> that there is a amount of 763,5MB of the class
> org.apache.logging.log4j.core.appender.AbstractManager
> see screenshot of the Analyse attached (2019-04-12 13_20_45-eclips...)
>
> Going deeper i tried to reconstruct the behavior in a test class and profiled
> its result (see screenshot-1).
> Looks like a memory leak to me.
> InnovaIntegrationsportalHibernateAppender
> {code:java}
> package de.itout.innova.log4j.innova_log4j_appender;
> import de.itout.innova.ssp.entities.ssp.entities.*;
> import de.itout.jpa.util.*;
> import java.io.*;
> import java.util.*;
> import javax.persistence.*;
> import org.apache.logging.log4j.core.*;
> import org.apache.logging.log4j.core.appender.*;
> import org.apache.logging.log4j.core.config.plugins.*;
> import org.apache.logging.log4j.core.layout.*;
> /**
> *
> * @author swendelmann
> */
> @Plugin(name = "InnovaIntegrationsportalHibernateAppender", category =
> "Core", elementType = "appender")
> public class InnovaIntegrationsportalHibernateAppender extends
> AbstractAppender
> {
> private String schnittstelle;
> private String version;
> private String laufId;
> private EntityManager em;
> public InnovaIntegrationsportalHibernateAppender(String name, Filter
> filter, Layout<? extends Serializable> layout)
> {
> super(name, filter, layout);
> }
> public InnovaIntegrationsportalHibernateAppender(String name, Filter
> filter, Layout<? extends Serializable> layout, boolean ignoreExceptions)
> {
> super(name, filter, layout, ignoreExceptions);
> }
> private InnovaIntegrationsportalHibernateAppender(String name, Filter
> filter, Layout<? extends Serializable> layout, boolean ignoreExceptions,
> String schnittstelle, String version, String laufId)
> {
> super(name, filter, layout, ignoreExceptions);
> this.schnittstelle = schnittstelle;
> this.version = version;
> this.laufId = laufId;
> }
> // Your custom appender needs to declare a factory method
> // annotated with `@PluginFactory`. Log4j will parse the configuration
> // and call this factory method to construct an appender instance with
> // the configured attributes.
> @PluginFactory
> public static InnovaIntegrationsportalHibernateAppender createAppender(
> @PluginAttribute("name") String name,
> @PluginElement("Layout") Layout<? extends Serializable> layout,
> @PluginElement("Filter") final Filter filter,
> @PluginAttribute("schnittstelle") String schnittstelle,
> @PluginAttribute("version") String version,
> @PluginAttribute("laufId") String laufId
> )
> {
> if (name == null)
> {
> LOGGER.error("No name provided for
> InnovaIntegrationsportalHibernateAppender");
> return null;
> }
> if (layout == null)
> {
> layout = PatternLayout.createDefaultLayout();
> }
> if (laufId == null || laufId.isEmpty())
> {
> LOGGER.error("No laufid provided for
> InnovaIntegrationsportalHibernateAppender");
> }
> return new InnovaIntegrationsportalHibernateAppender(name, filter,
> layout, true, schnittstelle, version, laufId);
> }
> @Override
> public void append(LogEvent event)
> {
> try
> {
> em = JPAUtil.getEntityManager("SSP");
> em.getTransaction().begin();
> LauflogPK lauflogPK = new LauflogPK(schnittstelle, version, laufId,
> getNextLaufLogPos());
> Lauflog lauflog = new Lauflog(lauflogPK);
> lauflog.setLevel(event.getLevel().name());
> Date eventDateTime = new Date(event.getTimeMillis());
> lauflog.setLastchangeAenderungsdatum(eventDateTime);
> lauflog.setLastchangeAenderungszeit(eventDateTime);
> lauflog.setLastchangeBenutzer("WENDELMANN");
> lauflog.setLastchangeLogflag('A');
> lauflog.setText(event.getMessage().getFormattedMessage());
> em.persist(lauflog);
> em.getTransaction().commit();
> }
> catch (Throwable t)
> {
> em.getTransaction().rollback();
> LOGGER.error("Cant commit to Database
> InnovaIntegrationsportalHibernateAppender ", t);
> //TODO Log to file
> }
> finally
> {
> try
> {
> if (em != null)
> {
> em.close();
> }
> }
> catch (Throwable t)
> {
> LOGGER.error("Cant close em: ", t);
> }
> }
> }
> /**
> * SELECT ISNULL(MAX(POS)+1,0) FROM LAUFLOG
> * @return
> */
> private int getNextLaufLogPos()
> {
> Integer i = (Integer) em.createQuery("SELECT MAX(l.lauflogPK.pos)+1 FROM
> Lauflog l WHERE l.lauflogPK.schnittstelle = :schnittstelle AND
> l.lauflogPK.version = :version AND l.lauflogPK.lauf = :lauf ")
> .setParameter("schnittstelle", this.schnittstelle)
> .setParameter("version", this.version)
> .setParameter("lauf", this.laufId)
> .getSingleResult();
> if (i == null)
> {
> return 0;
> }
> else
> {
> return i;
> }
> }
> }
> {code}
>
> Test Class for Profiling
> {code:java}
> package de.itout.innova.log4j;
> import de.itout.innova.log4j.innova_log4j_appender.*;
> import de.itout.jpa.util.*;
> import java.io.*;
> import java.nio.charset.*;
> import org.apache.logging.log4j.*;
> import org.apache.logging.log4j.core.*;
> import org.apache.logging.log4j.core.appender.*;
> import org.apache.logging.log4j.core.config.*;
> import org.apache.logging.log4j.core.layout.*;
> import org.junit.*;
> /**
> *
> * @author swendelmann
> */
> public class ProfilingTest
> {
> QEntityManager em;
> private org.apache.logging.log4j.Logger logg = LogManager.getLogger();
> // Potential memory leak
> final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
> public ProfilingTest()
> {
> }
> @Before
> public void setUp()
> {
> em = JPAUtil.getEntityManager("SSP");
> }
> @After
> public void tearDown()
> {
> em.close();
> }
> @Test
> public void testProfiling()
> {
> logg.trace("Start the Main Method");
> int runs = 1000;
> int logs = 10;
> String allSicherungsVerzeichnis = "target/sicherungsverzeichnis/";
> logg.debug("Start Test mit " + runs + " durchläufen");
> for (int i = 0; i < runs; i++)
> {
> String laufid = "LD0" + i;
> File laufLogFile = new File(allSicherungsVerzeichnis + laufid +
> "_full.log");
> Configuration config = ctx.getConfiguration();
> // Full File Logger
> Layout layout = PatternLayout.newBuilder()
> .withConfiguration(config)
> .withPattern(PatternLayout.SIMPLE_CONVERSION_PATTERN)
> .withCharset(Charset.forName("UTF-8"))
> .build();
> Appender fullAppender = FileAppender.newBuilder()
> .setConfiguration(config)
> .setName(laufid + "FULL")
> .withFileName(laufLogFile.getAbsolutePath())
> .withAppend(true)
> .withImmediateFlush(true)
> .setIgnoreExceptions(false)
> .setLayout(layout)
> .build();
> fullAppender.start();
> config.addAppender(fullAppender);
> // Hibernate Logger
> Appender appender =
> InnovaIntegrationsportalHibernateAppender.createAppender(laufid, null, null,
> "LISA_4711", "LI0001", laufid);
> appender.start();
> AppenderRef ref = AppenderRef.createAppenderRef(laufid, Level.ALL,
> null); // HIER LOGLEVEL DB EINSTELLEN
> AppenderRef refFull = AppenderRef.createAppenderRef(laufid + "FULL",
> Level.ALL, null); // HIER LOGLEVEL Datei einstellen
> AppenderRef[] refs = new AppenderRef[]
> {
> ref, refFull
> };
> LoggerConfig loggerConfig = LoggerConfig
> .createLogger(false, Level.ALL, laufid, "true", refs, null, config,
> null);
> loggerConfig.addAppender(appender, Level.ALL, null); // HIER LOGLEVEL
> ebenfalls einstellen
> loggerConfig.addAppender(fullAppender, Level.ALL, null); // HIER
> LOGLEVEL Datei einstellen
> config.addLogger(laufid, loggerConfig);
> ctx.updateLoggers();
> org.apache.logging.log4j.Logger log = LogManager.getLogger(laufid);
> for (int j = 0; j < logs; j++)
> {
> log.info("Ich bin nur eine Info und soll nur in das FullFile
> logging!");
> log.warn("Ich bin ein böser warning und soll in das FullFile und in
> das Innova Integrationsportal Hibernate Logging");
> }
> appender.stop();
> fullAppender.stop();
> config.removeLogger(laufid);
> config.getRootLogger().removeAppender(laufid);
> config.getRootLogger().remove(laufid+"FULL");
> ctx.updateLoggers();
> }
> logg.trace("Fertig");
> }
> }
> {code}
>
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