Java Driver
  1. Java Driver
  2. JAVA-306

The com.mongodb.Mongo.close() method can return before the cleanup thread is finished

      Details

      • Type: Bug Bug
      • Status: Closed Closed
      • Priority: Major - P3 Major - P3
      • Resolution: Fixed
      • Affects Version/s: 2.5.2
      • Fix Version/s: 2.6
      • Component/s: None
      • Labels:
        None
      • Operating System:
        ALL
      • # Replies:
        2
      • Last comment by Customer:
        false

        Description

        The method com.mongodb.Mongo.close() sets a signal that eventually tells the internal DBCleaner thread to close; which it correctly does. However, since the DBCleaner thread often sleeps, and cleaning up cursors could take a while, the thread will frequently not finish execution until after the close method returns. When this happens in apache tomcat, the following error is seen in tomcat's log files:

        SEVERE: The web application [/someWebApp] appears to have started a thread named [MongoCleaner892931837] but has failed to stop it. This is very likely to create a memory leak.

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          Sean Reilly           added a comment -

          I've committed a unit test and potential fix to github: https://github.com/seanjreilly/mongo-java-driver/commit/4d51cc32f6815c666c44ba6680f551b50da0f6cc

          With this patch, tomcat no longer emits an error message during web application shutdown.

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          Sean Reilly           added a comment - I've committed a unit test and potential fix to github: https://github.com/seanjreilly/mongo-java-driver/commit/4d51cc32f6815c666c44ba6680f551b50da0f6cc With this patch, tomcat no longer emits an error message during web application shutdown.
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          auto           added a comment -

          Author:

          {u'login': u'seanjreilly', u'name': u'Sean Reilly', u'email': u'seanjreilly@gmail.com'}

          Message: Closing a Mongo instance now waits for the cleaner

          http://jira.mongodb.org/browse/JAVA-306
          Mongo.close() now waits for the DBCleaner thread to finish
          before returning.
          Branch: master
          https://github.com/mongodb/mongo-java-driver/commit/d8547e2ecca267c95605ca97a3d3adee22d01973

          Show
          auto           added a comment - Author: {u'login': u'seanjreilly', u'name': u'Sean Reilly', u'email': u'seanjreilly@gmail.com'} Message: Closing a Mongo instance now waits for the cleaner http://jira.mongodb.org/browse/JAVA-306 Mongo.close() now waits for the DBCleaner thread to finish before returning. Branch: master https://github.com/mongodb/mongo-java-driver/commit/d8547e2ecca267c95605ca97a3d3adee22d01973

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              Dates

              • Created:
                Updated:
                Resolved:
                Days since reply:
                2 years, 43 weeks, 1 day ago
                Date of 1st Reply: