Erick Erickson created SOLR-11934:
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Summary: Visit Solr logging, it's too noisy.
Key: SOLR-11934
URL: https://issues.apache.org/jira/browse/SOLR-11934
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Erick Erickson
Assignee: Erick Erickson
I think we have way too much INFO level logging. Or, perhaps more correctly,
Solr logging needs to be examined and messages logged at an appropriate level.
We log every update at an INFO level for instance. But I think we log LIR at
INFO as well. As a sysadmin I don't care to have my logs polluted with a
message for every update, but if I'm trying to keep my system healthy I want to
see LIR messages and try to understand why.
Plus, in large installations logging at INFO level is creating a _LOT_ of files.
What I want to discuss on this JIRA is
1> What kinds of messages do we want log at WARN, INFO, DEBUG, and TRACE levels?
2> Who's the audience at each level? For a running system that's functioning,
sysops folks would really like WARN messages that mean something need attention
for instance. If I'm troubleshooting should I turn on INFO? DEBUG? TRACE?
So let's say we get some kind of agreement as to the above. Then I propose
three things
1> Someone (and probably me but all help gratefully accepted) needs to go
through our logging and assign appropriate levels. This will take quite a
while, I intend to work on it in small chunks.
2> Actually answer whether unnecessary objects are created when something like
log.info("whatever {}", someObjectOrMethodCall); is invoked. Is this
independent on the logging implementation used? The SLF4J and log4j seem a bit
contradictory.
3> Maybe regularize log, logger, LOG as variable names, but that's a nit.
As a tactical approach, I suggest we tag each LoggerFactory.getLogger in files
we work on with //SOLR-(whatever number is assigned when I create this). We can
remove them all later, but since I expect to approach this piecemeal it'd be
nice to keep track of which files have been done already.
Finally, I really really really don't want to do this all at once. There are
5-6 thousand log messages. Even at 1,000 a week that's 6 weeks, even starting
now it would probably span the 7.3 release.
This will probably be an umbrella issue so we can keep all the commits straight
and people can volunteer to "fix the files in core" as a separate piece of work
(hint).
There are several existing JIRAs about logging in general, let's link them in
here as well.
Let the discussion begin!
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