[jira] [Created] (KAFKA-3335) Kafka Connect hangs in shutdown hook

["Ben Kirwin (JIRA)" <ji...@apache.org>]

Ben Kirwin created KAFKA-3335:
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             Summary: Kafka Connect hangs in shutdown hook
                 Key: KAFKA-3335
                 URL: https://issues.apache.org/jira/browse/KAFKA-3335
             Project: Kafka
          Issue Type: Bug
            Reporter: Ben Kirwin


The `Connect` class can run into issues during start, such as:

{noformat}
Exception in thread "main" org.apache.kafka.connect.errors.ConnectException: Could not look up partition metadata for offset backing store topic in allotted period. This could indicate a connectivity issue, unavailable topic partitions, or if this is your first use of the topic it may have taken too long to create.
        at org.apache.kafka.connect.util.KafkaBasedLog.start(KafkaBasedLog.java:130)
        at org.apache.kafka.connect.storage.KafkaOffsetBackingStore.start(KafkaOffsetBackingStore.java:85)
        at org.apache.kafka.connect.runtime.Worker.start(Worker.java:108)
        at org.apache.kafka.connect.runtime.Connect.start(Connect.java:56)
        at org.apache.kafka.connect.cli.ConnectDistributed.main(ConnectDistributed.java:62)
{noformat}

This exception halts the startup process. It also triggers the shutdown hook... which blocks waiting for the service to start up before calling stop. This causes the process to hang forever.

There's a few things that could be done here, but it would be nice to bound the amount of time the process spends trying to exit gracefully.



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