Rahul Challapalli created DRILL-2444:
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Summary: JDBC creates non-daemon threads that outlive user's code
Key: DRILL-2444
URL: https://issues.apache.org/jira/browse/DRILL-2444
Project: Apache Drill
Issue Type: Bug
Components: Client - JDBC
Reporter: Rahul Challapalli
Assignee: Daniel Barclay (Drill)
Priority: Critical
I used the below maven dependency for the project :
{code}
<dependency>
<groupId>org.apache.drill.exec</groupId>
<artifactId>drill-jdbc-all</artifactId>
<version>0.8.0-SNAPSHOT</version>
<type>pom</type>
</dependency>
{code}
When I run the below class through eclipse, I see debug messages from the JDBC
code even after my man method finishes executing its last statement.
{code}
public class Dummy {
static final String JDBC_DRIVER = "org.apache.drill.jdbc.Driver";
static final String DB_URL =
"jdbc:drill:schema=dfs.drillTestDirViews;zk=x.x.x.x:5181/drill-build/cluster-drillbits";
static Connection conn;
public static void main(String[] args) throws Exception {
Class.forName(JDBC_DRIVER);
System.out.println("Connecting to database...");
conn = DriverManager.getConnection(DB_URL);
conn.close();
System.out.println("End Of Main");
}
}
{code}
Partial output from the console :
{code}
13:22:47.785 [Client-1] DEBUG io.netty.util.Recycler -
-Dio.netty.recycler.maxCapacity.default: 262144
End Of Main
13:22:55.992 [main-SendThread(10.10.100.190:5181)] DEBUG
org.apache.zookeeper.ClientCnxn - Got ping response for sessionid:
0x14a9c96266185ab after 0ms
13:23:09.338 [main-SendThread(10.10.100.190:5181)] DEBUG
org.apache.zookeeper.ClientCnxn - Got ping response for sessionid:
0x14a9c96266185ab after 1ms
{code}
Even if I do not call close on the connection object, the JVM should exit when
user code finishes execution.
Let me know if you have any questions
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