Maxim Ivanov created KAFKA-1933:
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Summary: Fine-grained locking in log append
Key: KAFKA-1933
URL: https://issues.apache.org/jira/browse/KAFKA-1933
Project: Kafka
Issue Type: Improvement
Components: log
Reporter: Maxim Ivanov
Assignee: Jay Kreps
Priority: Minor
Fix For: 0.8.2
This patch adds finer locking when appending to log. It breaks
global append lock into 2 sequential and 1 parallel phase.
Basic idea is to allow every thread to "reserve" offsets in non
overlapping ranges, then do compression in parallel and then
"commit" write to log in the same order offsets where reserved.
On my Core i3 M370 @2.4Ghz (2 cores + HT) it resulted in following performance
boost:
LZ4: 7.2 sec -> 3.9 sec
Gzip: 62.3 sec -> 24.8 sec
Kafka was configured to run 4 IO threads, data was pushed using 5 netcat
instances pushing in parallel batches of 200 msg 6.2 kb each (510 MB in total,
82180 messages in total)
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