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v5 Dropping PROM for Doctrine
By replacing the PROM model with the Doctrine ORM GOCDB will support RDBMSs other than Oracle. This will be released as GOCDB v5 (early Sept). Important changes to the Portal URLs and to the PI are detailed below.
- GOCDB v5 Test instance: https://gocdb-test.esc.rl.ac.uk/v5
- GOCDB v5 PI test: https://gocdb-test.esc.rl.ac.uk/v5_pi/public/<method_name>
- Write code once, deploy to Oracle, MySQL, Postgres, SQLite.
- Much simpler than the GOCDB/PROM model (see query comparison below)]
- Easier for other projects to extend / modify
- Easier for new developers to learn
- Better performance
- Reduced risk of failover performance issues
- Data will be deleted rather than marked as 'off'. We therefore require an audit table to record who/when performed data deletions/updates (this is on the requirements roadmap ).
- Loose some flexiblity as the DB will manage the relationships (FKs) between entities rather than the application (but in turn we gain performance/simplicity/db-agnostic).
- Changes to some PI methods (paging and carrying over v4 PKs)
- Changes to Portal URLs and object IDs (below)
The move to Doctrine will introduce some important changes. These are outlined below.
In PROM, each "entity" (site, service endpoint, downtime) was assigned an ID from a global pool. There is only one object 123, the GRIDOPS-GOCDB site. The following URL is used to access an entity regardless of type:
In v5 using Doctrine, each entity receives an ID unique only to that entity type. There is a site with ID 123, a service endpoint with ID 123 and a downtime with ID 123. The new URL will reflect the entity type:
(...and so on for each GOCDB entity type)
PI XML Output Values
In the GOCDB v4 PI there are a number of PROM specific XML values that will change when we move to Doctrine: PRIMARY_KEY, ID and GOCDB_PORTAL_URL. These are highlighted in RED below:
- ID fields will NOT be consistent between v4 and v5 (each new object will get a new Doctrine ID value).
- The GOCDB_PORTAL_URL will therefore NOT be consistent between v4 and v5.
- The v4 PRIMARY_KEY value will be carried over only for Sites and Downtimes, see below:
Update Aug 2013 - Preserving v4 <PRIMARY_KEY> element values
- v4 <PRIMARY_KEY> element values are carried over for Sites and Downtimes to maintain backward compatiblity (get_site, get_site_list, get_downtime)
- No preservation of v4 <PRIMARY_KEY> element values are planned for:
- get_service_endpoint (no reports that v4 SE PRIMARY_KEY values are required for carry over)
- Please check!
PI get_downtime method paging
- The ‘get_downtime’ PI method requires a new mandatory ‘&page’ parameter to limit the number of returned downtimes to a sensible limit (500 in each page).
- Required to reduce server load and max query execution time (consider ~10,000 XML downtimes rendered in one page).
- The 'get_downtime' method should be re-issued by the client and each time the page parameter should be incremented by one until an empty <results/> element is returned indicating no more results, e.g.
- Paging is not required when issuing the 'all_lastmonth' param as below:
PI get_downtime method 'all_lastmonth'
- ‘&all_lastmonth’ can be used to return all downtimes that have started or will start within 1month+1day from current date (inc. current and future DTs).
- Results are not paged - *all* DTs returned for this window. ‘&page’ parameter can be excluded if specifying ‘all_lastmonth’ e.g.
- WARNING: The number of results should normally fall within the page limit, but since paging is turned off, this query could potentially be expensive/problematic if there are many more DTs than the page limit. Without paging, this query can theoretically fail!
Request for Comments
If these changes affect a system that reads from the GOCDB-PI or links to the web portal please let us know.