ASF GitHub Bot logged work on BEAM-3500:

                Author: ASF GitHub Bot
            Created on: 11/Mar/18 18:26
            Start Date: 11/Mar/18 18:26
    Worklog Time Spent: 10m 
      Work Description: jkff commented on a change in pull request #4461: 
[BEAM-3500] "Attach" JDBC connection to the bundle and add DataSourceFactory 
allowing full control of the way the DataSource is created
URL: https://github.com/apache/beam/pull/4461#discussion_r173664072

 File path: 
 @@ -327,12 +342,42 @@ DataSource buildDatasource() throws Exception{
         if (getConnectionProperties() != null && 
getConnectionProperties().get() != null) {
-        return basicDataSource;
+        current = basicDataSource;
+      // wrapping the datasource as a pooling datasource
+      DataSourceConnectionFactory connectionFactory = new 
+      PoolableConnectionFactory poolableConnectionFactory =
+              new PoolableConnectionFactory(connectionFactory, null);
+      GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig();
+      poolConfig.setMaxTotal(getPoolMaxTotal());
+      poolConfig.setBlockWhenExhausted(true);
+      poolConfig.setMaxIdle(getPoolMaxTotal());
+      poolConfig.setMinIdle(0);
+      poolConfig.setTestOnBorrow(false);
+      poolConfig.setTestOnReturn(false);
+      poolConfig.setTestWhileIdle(true);
+      poolConfig.setLifo(true);
+      GenericObjectPool connectionPool =
+              new GenericObjectPool(poolableConnectionFactory, poolConfig);
+      poolableConnectionFactory.setPool(connectionPool);
+      poolableConnectionFactory.setDefaultAutoCommit(false);
 Review comment:
   I don't think these settings are necessary either.

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Issue Time Tracking

    Worklog Id:     (was: 79308)
    Time Spent: 3h 20m  (was: 3h 10m)

> JdbcIO: Improve connection management
> -------------------------------------
>                 Key: BEAM-3500
>                 URL: https://issues.apache.org/jira/browse/BEAM-3500
>             Project: Beam
>          Issue Type: Improvement
>          Components: io-java-jdbc
>    Affects Versions: 2.2.0
>            Reporter: Pawel Bartoszek
>            Assignee: Jean-Baptiste Onofré
>            Priority: Major
>          Time Spent: 3h 20m
>  Remaining Estimate: 0h
> JdbcIO write DoFn acquires connection in {{@Setup}} and release it in 
> {{@Teardown}} methods, which means that connection might stay opened for days 
> in streaming job case. Keeping single connection open for so long might be 
> very risky as it's exposed to database, network etc issues.
> *Taking connection from the pool when it is actually needed*
> I suggest that connection would be taken from the connection pool in 
> {{executeBatch}} method and released when the batch is flushed. This will 
> allow the pool to take care of any returned unhealthy connections etc.
> *Make JdbcIO accept data source factory*
>  It would be nice if JdbcIO accepted DataSourceFactory rather than DataSource 
> itself. I am saying that because sink checks if DataSource implements 
> `Serializable` interface, which make it impossible to pass 
> BasicDataSource(used internally by sink) as it doesn’t implement this 
> interface. Something like:
> {code:java}
> interface DataSourceFactory extends Serializable{
>      DataSource create();
> }
> {code}

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