KARAF: Locking error in DefaultJDBCLock, also contains an eventual OutOfMemory
error on locked processes.
---------------------------------------------------------------------------------------------------------
Key: FELIX-1192
URL: https://issues.apache.org/jira/browse/FELIX-1192
Project: Felix
Issue Type: Bug
Components: Karaf
Affects Versions: karaf-1.0.0
Environment: All
Reporter: Jamie goodyear
If you configure servicemix to use the DefaultJDBCLock like so:
{noformat}
karaf.lock=true
karaf.lock.class=org.apache.felix.karaf.main.DefaultJDBCLock
karaf.lock.level=50
karaf.lock.delay=1000
karaf.lock.jdbc.url=jdbc:mysql://localhost:3306/somedatabase
karaf.lock.jdbc.driver=org.apache.derby.jdbc.ClientDriver
karaf.lock.jdbc.user=root
karaf.lock.jdbc.password=
karaf.lock.jdbc.table=KARAF_LOCK
karaf.lock.jdbc.clustername=mycluster
karaf.lock.jdbc.timeout=30
{noformat}
and simply run it you'll get an OutOfMemory error printed to the console within
an hour or so. It appears that the offending code is here:
{noformat}
/**
* isAlive - test if lock still exists.
*/
public boolean isAlive() throws Exception {
if (lockConnection == null) { return false; }
PreparedStatement statement = null;
try {
lockConnection.setAutoCommit(false);
statements.init(lockConnection);
String sql = statements.testLockTableStatus();
statement = lockConnection.prepareStatement(sql);
statement.execute();
} catch (Exception ex) {
return false;
}
return true;
}
{noformat}
the try/catch statement needs a finally to ensure the PreparedStatement is
cleaned up:
{noformat}
} finally {
if (statement != null) {
try {
statement.close();
} catch (SQLException e) {
//log failure here...
}
}
}
{noformat}
We should also put some unit testing in place for this class and ensure that it
doesn't leak any other resources, JDBC or otherwise as this class is used to
set up master/slave HA which is an important use case to support.
Also of note is that the container level locking mechanism seems to not be
honored by slave processes. In the Main#lock method if the lock is enabled we
should only start up to the configured lock level, otherwise start Karaf up to
the default lock level.
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