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Large CPU usage due to busy waiting by KafkaConsumer.poll() #1383

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braedon opened this issue Feb 16, 2018 · 0 comments
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Large CPU usage due to busy waiting by KafkaConsumer.poll() #1383

braedon opened this issue Feb 16, 2018 · 0 comments

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@braedon
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braedon commented Feb 16, 2018

KafkaConsumer.poll() is effectively busy waiting, as KafkaConsumer._poll_once() doesn't respect timeout_ms.

_poll_once() sets timeout_ms of KafkaClient.poll() to:

min(timeout_ms, self._coordinator.time_to_next_poll())

However, ConsumerCoordinator.time_to_next_poll() returns the time in seconds, not milliseconds. The effective timeout is always much lower than timeout_ms, causing KafkaConsumer.poll() to spin, consuming a lot of CPU.
braedon added a commit to braedon/kafka-python that referenced this issue Feb 16, 2018
@braedon
Correctly respect timeouts in consumer poll interface
05920f2 
ConsumerCoordinator.time_to_next_poll() returns seconds, so need to convert
to milliseconds.

Fixes dpkp#1383
@braedon braedon mentioned this issue Feb 16, 2018
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