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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3244) JDBC CassandraConnection may lead to memory leak when used in a pool
Date Wed, 05 Oct 2011 20:32:29 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121442#comment-13121442
] 

Hudson commented on CASSANDRA-3244:
-----------------------------------

Integrated in Cassandra #1142 (See [https://builds.apache.org/job/Cassandra/1142/])
    remove statements from connection's list, when closed manually
patch by Rick Shaw; reviewed by Patricio Echague and jbellis for CASSANDRA-3244

jbellis : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1179399
Files : 
* /cassandra/trunk/drivers/java/src/org/apache/cassandra/cql/jdbc/CassandraConnection.java
* /cassandra/trunk/drivers/java/src/org/apache/cassandra/cql/jdbc/CassandraStatement.java

                
> JDBC CassandraConnection may lead to memory leak when used in a pool
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-3244
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3244
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Drivers
>            Reporter: Patricio Echague
>            Assignee: Rick Shaw
>            Priority: Minor
>              Labels: JDBC
>         Attachments: 3244-v1.txt, 3244-v2.txt
>
>
> I may be wrong here but I noticed that the implementations of CassandraConnection#createStatement()
and CassandraConnection#prepareStatement() keep(cache) the created Statement/PrepareStatement
internally in a List.
> They list is freed up only during CassandraConnection.close() which makes me think that,
if the connection object is used in a pool implementation, it will lead to a memory leak as
it will hold every single statement that is used to interact with the DB until the connection
gets closed. 

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