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https://issues.apache.org/jira/browse/SOLR-11934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16349031#comment-16349031
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Gus Heck commented on SOLR-11934:
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Yeah, logs having already rolled off is the flip side of the problem of course.
An idea rolling around in the back of my head for some time after Dave and I
get Time Routed Aliases fully sorted out is a feature to turn on self-indexing
of logs (into a TRA of course) to make our own logs searchable. One component
of that idea might be to separate logging by collection or groups of
collections. It would be interesting to have a collection parameter that
defines the logging context for that collection, which then results in a
sub-dir containing just the logging for operations on the collections with that
context. Obviously that's non-trivial and other ticket etc. WRT searchable logs
that would be needed to avoid an endless loop of indexing the logs of indexing
the logs of indexing the logs etc...
I suspect %C could get better in Java 9, if the stack walking api can be
leveraged by log4j2... but yeah probably that should be off by default.
Benchmarking with/without would be interesting (when did it get added? maybe
the benchmarks were done at at that time)
I'm also wondering if there might be a way to use Markers or MDC to categorize
logging statements in ways orthogonal to levels. The idea would be to make it
easy to filter out (or focus in on) overseer message processing stuff or
whatnot... Of course much of the above has to wait for SOLR-7887 ...
> 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
> Priority: Major
>
> 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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