Moved hintfilter documentation to the correct place and cleaned it
up. Added a note at the start of the syntax documentation about the
behavior of the hint parsing to warn users of possible unexpected
behavior. The hint parsing could really use some refactoring to make it
more manageable which is why the preliminary fix version of the bug will
be 2.4.
It is now possible to prevent the masking filter from rejecting
statements using functions in conjunction with fields to be
masked. So now it is possible to not use the blanket rejection
of the masking filter and replace it with more detailed firewall
rules.
Also change the following defaults:
- "selects": Was "verify_cacheable", is now "assume_cacheable"
- "cached_data": Was "shared", is now "thread_specific"
The possibility to have multiple cache rules in a cache
configuration file is now handled throughout the cache
filter.
The major difference is that while you earlier directly
queried the Cache whether data should be stored to the
cache and whether data in the cache should be used, you
now query the Cache whether data should be stored to the
cache and, if so, get a CacheRules object from which you
subsequently query whether data from the cache should
be used.
Exposing the canonicalization code in the luafilter allows it to be used
on the Lua side of things. This should enable some pretty cool stuff to be
done with it.
Now it is possible to control the soft and hard ttl of the
cache on a session basis. That is, it is possible to use
different TTLs for different SELECTs.
The earlier @maxscale.cache.enabled has now been replaced with
@maxscale.cache.populate and @maxscale.cache.use that provide
for more flexibility.
With the former it is possible to control in what circumstances
the cache is populated and with the latter one when it is used.
Together they can be used for having a completely client driven
caching.
If there are several 'users' lines in a rule file, for a particular
user, the rules each matching line will be checked independently
until a rule match is found.
That is, the rules of each 'users' line are treated in an OR-fashion
with respect to each other.
