I think the main motivation has always been to have no dependencies in
the core so as to keep it as fast and lightweight as possible. Then,
of course, there is always the usual religious wars around which
logging framework to use, not to mention the nightmare that is trying
to manage multiple logging frameworks across several projects that are
being integrated. Then, of course, there is the question of how
useful any core Lucene logs would be to users writing search
applications. For the most part, my experience has been that I want
logging to tell me when a document was added, when searches occur,
etc. but I don't necessarily need to know things like the fact that
Lucene is now entering the analysis phase of Document inversion. And,
for all these needs, I can just as well do that logging in the
application and not in Lucene.
All that is not to say we couldn't add in logging, I'm just suggesting
reasons I can think of for why it has not been added to date and why I
am not sure it needs to be there going forward. I believe various
other people have contributed reasons in the past. I seem to recall
Doug spelling some out, but don't have the thread handy.
-Grant
On Dec 5, 2008, at 1:17 PM, Shai Erera wrote:
Hi
I was wondering why doesn't the Lucene code uses Java logging,
instead of the infoStream set in IndexWriter? Today, if I want to
enable tracing of Lucene code, the only thing I can do is set an
infoStream, but then I get many many messages. Moreoever, those
messages seem to cover indexing code only.
I hope to get some opinions on the use of Java logging instead of
infoStream, and hopefully to start addind logging messages in other
places in the code (like during search, query parsing etc.)
I feel that this is an approach the community has to decide on
before we start adding messages to the code. Using Java logging can
greatly benefit tracing of indexing applications who use Lucene. If
the vote is +1 for using Java logging, we can start by deprecating
infoStream (in 2.9, remove in 3.0) and use logging instead.
What do you think?
Shai
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