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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