Nikita created KAFKA-15255:
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Summary: Task is not stopped until the poll interval passes in
case of task restarting.
Key: KAFKA-15255
URL: https://issues.apache.org/jira/browse/KAFKA-15255
Project: Kafka
Issue Type: Bug
Components: KafkaConnect
Reporter: Nikita
We face a problem with the restarting of the tasks, sometimes it leads to
resource leak.
We used the jdbc source connector and noticed an increasing of count of opened
sessions on Vertica side. But this problem is applicable for all databases and
possibly for all source connectors.
Our case is the next:
1) Run jdbc source connector (io.confluent.connect.jdbc.JdbcSourceConnector)
and set poll.interval.ms (86400000) > task.shutdown.graceful.timeout.ms (it's
the property on Kafka-connect side, we set 10000)
2) Send POST /connectors/<connector_name>/tasks/<task_number>/restart
ER: count of session is the same as before restart
AR: count of session increases
The main problem is when
org.apache.kafka.connect.runtime.Worker#stopAndAwaitTasks(java.util.Collection<org.apache.kafka.connect.util.ConnectorTaskId>)
method is called it doesn't stop a source task itself.
The source task stops only if polling process stops on source task side.
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