On 26 June 2010 03:36, MarkSwanson <mark.swanson...@gmail.com> wrote:
> I still like timestamps even with per-user logging.
Sorry, I guess wasn't entirely clear.
The maps would still contain timestamps. My point is that we should
get away from the idea thinking of logs as unstructured text strings.
For example, a typical log message for a web application might look
something like:
{:application "Some app"
:timestamp "20100626T112154Z"
:server-ip "10.23.1.34"
:request-uuid "885902e5-4fd0-43b3-b3d6-8961e8987278"
:session-user-id 102
:level "error"
:message "Inconsistent user data"
:stacktrace ["<line1>" "<line2>" ...]}
Something with lots of juicy information we can filter on, and
something that can be elegantly displayed in a web-based user
interface.
> I prefer files. Using a DB prevents me from using existing powerful
> tools to search and query the logs: vim and emacs.
Databases are usually quite good at querying information as well; that
is something they are designed to do, after all. I believe MongoDB has
support for regular expression searches, so there's not really
anything you can do with a text editor that you can't with a
sufficiently advanced database.
You also get more fine-grained control over storage. For instance, I
might want to have debugging messages expire after five days, but
error messages expire after three months. Or perhaps I want to blind
user information before exposing the logs to developers.
That said, any good logging library has support for multiple back
ends. If you didn't want to write out to a database, you could plug in
your own storage system that divides files up by user ID and date, and
then appends the log messages to a text file.
- James
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