[
https://issues.apache.org/jira/browse/KAFKA-4829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890917#comment-15890917
]
Guozhang Wang commented on KAFKA-4829:
--------------------------------------
I'd like to expand the scope of this JIRA a bit to make a pass over all the
log4j entries in Streams and see:
1. If some INFO logging is too verbose / frequent that we can reduce.
2. If some TRACE / DEBUG logging is very vital and hence should be in DEBUG /
INFO logging as long as they are not too frequent.
> Improve logging of StreamTask commits
> -------------------------------------
>
> Key: KAFKA-4829
> URL: https://issues.apache.org/jira/browse/KAFKA-4829
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 0.10.2.0
> Reporter: Steven Schlansker
> Priority: Minor
> Labels: user-experience
>
> Currently I see this every commit interval:
> {code}
> 2017-02-28T21:27:16.659Z INFO <> [StreamThread-1]
> o.a.k.s.p.internals.StreamThread - stream-thread [StreamThread-1] Committing
> task StreamTask 1_31
> 2017-02-28T21:27:16.659Z INFO <> [StreamThread-1]
> o.a.k.s.p.internals.StreamThread - stream-thread [StreamThread-1] Committing
> task StreamTask 2_31
> {code}
> We have ~10 tasks in our topology, 4 topics, and 32 partitions per topic.
> This means every commit interval we log a few hundred lines of the above
> which is an order of magnitude chattier than anything else in the log
> during normal operations.
> To improve visibility of important messages, we should reduce the chattiness
> of normal commits and highlight abnormal commits. An example proposal:
> existing message is fine at TRACE level for diagnostics
> {{TRACE o.a.k.s.p.i.StreamThread - Committing task StreamTask 1_31}}
> normal fast case, wrap them all up into one summary line
> {{INFO o.a.k.s.p.i.StreamThreads - 64 stream tasks committed in 25ms}}
> some kind of threshold / messaging in case it doesn't complete quickly or
> logs an exception
> {{ERROR o.a.k.s.p.i.StreamThread - StreamTask 1_32 did not commit in 100ms}}
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
