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  1. Java Driver
  2. JAVA-306

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

        Details

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

          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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            seanjreilly 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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            seanjreilly 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 auto (Inactive) 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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            auto auto (Inactive) 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:
                  6 years, 6 weeks, 4 days ago
                  Date of 1st Reply: