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  1. MariaDB Connector/J
  2. CONJ-683

Timer task doesn't stop after finishing query

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Duplicate
    • 2.4.0
    • N/A
    • Other
    • None

    Description

      Create MariaDbStatement with queryTimeout and exequte a query.
      In this moment will be created new thread with name"MariaDB-timeout-1".
      But after finishing the query this thread is still alive.
      As result, if we have web application on Tomcat and interrupt it, we get warning:

      13-Feb-2019 17:42:10.645 WARNING [Thread-5] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [...] appears to have started a thread named [MariaDb-timeout-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
      		 
       sun.misc.Unsafe.park(Native Method)
      		 
       java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
      		 
       java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
      		 
       java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
      		 
       java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
      		 
       java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
      		 
       java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
      		 
       java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
      		 
       java.lang.Thread.run(Thread.java:748)

      This case is reproduced on Tomcat 8.5.37 with mariadb-java-client 2.4.0

      Attachments

        Issue Links

          duplicates

          Task - A task that needs to be done. CONJ-563 Thread leak reported by Tomcat when using the connector

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

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            People

              diego dupin Diego Dupin
              pavzay Pavel Zaichyk
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              Dates

                Created:
                Updated:
                Resolved:

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