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https://issues.apache.org/jira/browse/KAFKA-3213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liquan Pei reassigned KAFKA-3213:
---------------------------------
Assignee: Liquan Pei (was: Ewen Cheslack-Postava)
> [CONNECT] It looks like we are not backing off properly when reconfiguring
> tasks
> --------------------------------------------------------------------------------
>
> Key: KAFKA-3213
> URL: https://issues.apache.org/jira/browse/KAFKA-3213
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Reporter: Gwen Shapira
> Assignee: Liquan Pei
>
> Looking at logs of attempt to reconfigure connector while leader is
> restarting, I see:
> {code}
> [2016-01-29 20:31:01,799] ERROR IO error forwarding REST request:
> (org.apache.kafka.connect.runtime.rest.RestServer)
> java.net.ConnectException: Connection refused
> [2016-01-29 20:31:01,802] ERROR Request to leader to reconfigure connector
> tasks failed (org.apache.kafka.connect.runtime.distributed.DistributedHerder)
> org.apache.kafka.connect.runtime.rest.errors.ConnectRestException: IO Error
> trying to forward REST request: Connection refused
> [2016-01-29 20:31:01,802] ERROR Failed to reconfigure connector's tasks,
> retrying after backoff:
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder)
> org.apache.kafka.connect.runtime.rest.errors.ConnectRestException: IO Error
> trying to forward REST request: Connection refused
> [2016-01-29 20:31:01,803] DEBUG Sending POST with input
> [{"tables":"bar","table.poll.interval.ms":"1000","incrementing.column.name":"id","connection.url":"jdbc:mysql://worker1:3306/testdb?user=root","name":"test-mysql-jdbc","tasks.max":"3","task.class":"io.confluent.connect.jdbc.JdbcSourceTask","poll.interval.ms":"1000","topic.prefix":"test-","connector.class":"io.confluent.connect.jdbc.JdbcSourceConnector","mode":"incrementing"},{"tables":"foo","table.poll.interval.ms":"1000","incrementing.column.name":"id","connection.url":"jdbc:mysql://worker1:3306/testdb?user=root","name":"test-mysql-jdbc","tasks.max":"3","task.class":"io.confluent.connect.jdbc.JdbcSourceTask","poll.interval.ms":"1000","topic.prefix":"test-","connector.class":"io.confluent.connect.jdbc.JdbcSourceConnector","mode":"incrementing"}]
> to http://worker2:8083/connectors/test-mysql-jdbc/tasks
> (org.apache.kafka.connect.runtime.rest.RestServer)
> [2016-01-29 20:31:01,803] ERROR IO error forwarding REST request:
> (org.apache.kafka.connect.runtime.rest.RestServer)
> java.net.ConnectException: Connection refused
> [2016-01-29 20:31:01,804] ERROR Request to leader to reconfigure connector
> tasks failed (org.apache.kafka.connect.runtime.distributed.DistributedHerder)
> org.apache.kafka.connect.runtime.rest.errors.ConnectRestException: IO Error
> trying to forward REST request: Connection refused
> {code}
> Note that it looks like we are retrying every 1ms, while I'd expect a retry
> every 250ms.
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