The MongoDB health indicators ran the `hello` command against every
database returned by `listDatabaseNames()`. For the reactive
indicator these commands were issued in parallel via `flatMap`, so a
deployment with many databases per connection could open a connection
per database on each health check, dramatically increasing connection
usage (a regression from the Spring Data based implementation used
previously).
Since `hello` is a server-level command whose result is independent
of the target database, run it only once, against the `admin`
database if available or the first returned database otherwise. The
`databases` and `maxWireVersion` details are preserved.
See gh-50734
Signed-off-by: seonwoo_jung <79202163+seonwooj0810@users.noreply.github.com>
Previously the MongoDB health indicates used Spring Data's templates
(imperative and reactive) to access MongoDB. This prevented health
information from being available in apps using Mongo's Java Driver
directly.
This commit updates the health indicates so that they no longer
depend upon Spring Data MongoDB and instead using MongoDB's Java
Driver directly. As they no longer depend on Spring Data MongoDB,
the indicators have also moved from spring-boot-data-mongodb to
spring-boot-mongodb.
Closes gh-47051
Previously, all configuration properties for MongoDB used the
prefix spring.data.mongodb irrespective of whether or not they
required Spring Data MongoDB.
This commit renames the properties that do not require Spring Data
MongoDB to use the prefix spring.mongodb.
Closes gh-34954
Hyunwoo Jung
seonwoo_jung
Stéphane Nicoll
Andy Wilkinson
Moritz Halbritter
Phillip Webb