Jay Kreps created KAFKA-2950:
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Summary: Performance regression in producer
Key: KAFKA-2950
URL: https://issues.apache.org/jira/browse/KAFKA-2950
Project: Kafka
Issue Type: Bug
Reporter: Jay Kreps
For small messages the producer has gotten slower since the 0.8 release. E.g.
for a single thread on linux sending 100 byte messages the decrease seems to be
about 30%. The root cause seems to be that the new timeout we added for
max.block.ms ends up doing about 4 more system calls to check the ellapsed time.
The reason for these calls is to detect slow serializers or partitioners. But I
think this is not worth the performance hit. I think we can say the config is
only for blocking due to metadata or memory allocation.
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