MS RFC 47: Move IGNORE_MISSING_DATA to run-time configuration¶
|Contact:||pramsey at cleverelephant.ca|
|Status:||Adopted on 2008-10-15 - Completed|
Making the options for ignoring missing data in tile-indexed layers and WMS client layers more flexible, and configurable at run-time via the map file.
Currently MapServer has only compile-time (./configure –ignore-missing-data) control of behavior when files referenced in tile indexes are missing, via the IGNORE_MISSING_DATA define, and that behavior is applied globally.
Under this RFC, the missing data behavior will be defined:
- at run time
- globally for a map file
As well, the option to “fail on a missing layer” will be added to the WMS client code, which currently defaults to “ignore on a missing layer”.
All changes will preserve the current default behavior in cases where new behavior is not requested by the user: missing data in tileindexes will continue to cause failure and missing WMS layers will continue to be ignored, unless MapServer is compiled with –ignore-missing-data.
A map-level configuration option will be added, CONFIG “ON_MISSING_DATA” “[ACTION]”, with the following valid actions: “IGNORE”, “LOG”, “FAIL”. The default map-level behavior will be “FAIL”, unless MapServer is compiled with –ignore-missing-data, in which case it will be “LOG”. This will preserve the current behavior for all legacy mapfiles and compile set-ups.
In the case of “LOG” behavior, the logging will only occur if the mapfile is set up for logging: DEBUG is set and MS_ERRORFILE is set. Documentation must note that DEBUG and MS_ERRORFILE need to be set.
At the same time, this ticket (#2722) can probably be tracked down and resolved.
mapshape.c mapogr.c mapraster.c maprasterquery.c
- Documentation will be updated to reflect the new feature
- MapServer Mapfile Reference
Backwards Compatibility Issues¶
None. Legacy mapfiles and compile setups should retain existing behavior in the presence of this new code.