Lianet Magrans created KAFKA-18812:
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Summary: Improving new consumer API errors upon background thread
failures
Key: KAFKA-18812
URL: https://issues.apache.org/jira/browse/KAFKA-18812
Project: Kafka
Issue Type: Improvement
Components: consumer
Reporter: Lianet Magrans
The new consumer background thread could failed to start, in which case will
log an error and die. At the moment, the expectation is that consumer api calls
will fail with TimeoutException (KafkaException) when sending events to the
background for processing and wait for responses (that will never be received).
We should review to consider improving, given that seems pointless to wait for
an event to be processed if we know the background thread is not running.
Note that once in this area, we should also review the errors propagated to the
API if the background fails on a single run (runOnce), which also logs but the
thread does not die. The expectation in this case is that individual API calls
will fail when trying to access resources that may not be available (ex. a
request manager). But each process within ApplicationEventProcessor handles
this kind of situation differently, so we should improve it if we consider,
consistently for all APIs
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