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From "Xiaomin Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-15551) memory leak in directsql for mysql specific initialization
Date Fri, 06 Jan 2017 09:44:58 GMT
Xiaomin Zhang created HIVE-15551:
------------------------------------

             Summary: memory leak in directsql for mysql specific initialization
                 Key: HIVE-15551
                 URL: https://issues.apache.org/jira/browse/HIVE-15551
             Project: Hive
          Issue Type: Bug
          Components: Metastore
    Affects Versions: 0.13.0
            Reporter: Xiaomin Zhang


We observed HMS memory leak when directsql is enabled for MySQL metastore DB.  

The affected code is in the method MetaStoreDirecdtSql.executeNoResult():

((Connection)jdoConn.getNativeConnection()).createStatement().execute(queryText);

The statement object (from createStatement()) is unfortunately referenced in the Connection
object.  Although close() is called on the Connection object  in finally block, the BoneCP
just moves it to a freeConnection list. Hence, statement object never get chances to be closed.

The leaked statement object is not huge (~1KB as observed in memory analyzer). However long
running Hive Metastore Server is very likely ended up with bad performance doing frequent
garbage collection.



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