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https://issues.apache.org/jira/browse/BEAM-3500?focusedWorklogId=79309&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-79309
]
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_r173663972
##########
File path:
sdks/java/io/jdbc/src/main/java/org/apache/beam/sdk/io/jdbc/JdbcIO.java
##########
@@ -327,12 +342,42 @@ DataSource buildDatasource() throws Exception{
if (getConnectionProperties() != null &&
getConnectionProperties().get() != null) {
basicDataSource.setConnectionProperties(getConnectionProperties().get());
}
- return basicDataSource;
+ current = basicDataSource;
}
+
+ // wrapping the datasource as a pooling datasource
+ DataSourceConnectionFactory connectionFactory = new
DataSourceConnectionFactory(current);
+ PoolableConnectionFactory poolableConnectionFactory =
+ new PoolableConnectionFactory(connectionFactory, null);
+ GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig();
+ poolConfig.setMaxTotal(getPoolMaxTotal());
+ poolConfig.setBlockWhenExhausted(true);
Review comment:
Almost all of these parameters are also irrelevant because there will be at
most 1 connection - please keep only the necessary ones. I think really you
only need maxTotal=1, minIdle=0.
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Issue Time Tracking
-------------------
Worklog Id: (was: 79309)
Time Spent: 3.5h (was: 3h 20m)
> 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: 3.5h
> 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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