Hi Uwe, I agree ten dimensions is not much per se, but you might say 10 categories for disaggregation per data element is a lot. Would it be possible to redesign the model a bit, and rely more on data element group sets + groups where you classify your data elements? This as opposed to having everything as categories / options.
5 million option combos I think will in any case take some time to generate and maintain. If you are willing to share some more info on your use-case perhaps someone can offer some views. regards, Lars On Tue, Jun 7, 2016 at 12:28 PM, Morten Olav Hansen <[email protected]> wrote: > Hi Uwe > > The improvements are mainly for speed and validation. Yes, we are now (in > 2.24) introducing versioned web-api, so that endpoint importer will be > available until 2.26 (we will support 3 versions). In 2.24, the same > endpoint is available at /api/24/metadata. > > If you are using cURL, or another utility.. the import part would be the > same, but the UI in 2.23 can not be used, as it's hardcoded to legacy > importer. > > -- > Morten Olav Hansen > Senior Engineer, DHIS 2 > University of Oslo > http://www.dhis2.org > > On Tue, Jun 7, 2016 at 11:25 PM, Uwe Wahser <[email protected]> wrote: > >> Hi Morten, >> >> no, i didn't. What would be the procedure for that? Importing Categories, >> Options and CategoryCombinations via api and having DHIS2 generate the >> CategoryOptionCombinations? Would that bring about any change at all or >> does the >> importer use different libs for generating the COCs? >> >> btw. is the 23 in the api link valid for future dhis2 versions? I noticed >> it in >> a few api descriptions recently ... >> >> Regards, Uwe >> >> > Morten Olav Hansen <[email protected]> hat am 7. Juni 2016 um 18:50 >> > geschrieben: >> > >> > >> > Hi Uwe >> > >> > Did you try out new importer? Available as /api/23/metadata in 2.23 >> > >> > On Tuesday, 7 June 2016, Uwe Wahser <[email protected]> wrote: >> > >> > > Dear devs, >> > > >> > > I am experiencing problems when handling category combinations. Our >> > > protoype >> > > with 5 dimensions went through the process of generating >> > > categoryOptionCombinations (~20.000 records) quite well. 7 dimensions >> > > (~400.000) >> > > worked as well, although it took a very long time. >> > > >> > > Now we defined the next datamodel with 10 dimensions (expecting ~5Mio >> > > categoryOptionCombinations) and the process dies without further >> notice. >> > > Last >> > > words in catalina.out: >> > > * INFO 2016-06-07 13:29:33,783 Building object-bridge maps >> (preheatCache: >> > > true, >> > > 3 classes). (DefaultObjectBridge.java [http-bio-8180-exec-15]) >> > > * INFO 2016-06-07 13:29:36,779 Building object-bridge maps took 2.99 >> > > seconds. >> > > (DefaultObjectBridge.java [http-bio-8180-exec-15]) >> > > * INFO 2016-06-07 13:29:36,896 'admin' update >> > > org.hisp.dhis.dataelement.DataElementCategoryCombo, name: Membership, >> uid: >> > > SCgLXYHqVzz (AuditLogUtil.java [http-bio-8180-exec-15]) >> > > >> > > Ten dimensions with not extraordinarily big option sets is actually >> not >> > > unusual >> > > and rather slim for multi-dimensional data-models in data warehouses, >> so >> > > I'd >> > > expect DHIS2 to be able to handle this easily. >> > > >> > > Could of course be a memory problem (tried up to 14g for tomcat on a >> 4-core >> > > Ubuntu 14.04 server, DHIS 2.23) Before I'll start experimenting with >> other >> > > parameters, I am hoping to get some hints on known limitations or >> > > workarounds >> > > from you (not allowed: reducing the number of options or categories, >> > > sql-hacks >> > > :-) ). Is there any info on whether optimizations on this process are >> being >> > > planned in the kernel? >> > > >> > > Some observations on the process: >> > > >> > > * during generation (either when saving the categoryCombination or in >> the >> > > data >> > > maintenance menu): >> > > - long names - cOCs are generated with generated names that are >> getting >> > > extremely long as they are mere concats of the involved >> categoryOptions. >> > > Could >> > > there be an option to just use the codes as basis or to leave away the >> > > names >> > > completely? Could be one reason for a memory problem and performance >> > > issues. >> > > - long log entries - every single entry is logged in catalina.out with >> > > several >> > > lines of text, causing catalina to become extremely big. >> > > - during execution lots of Java-memory are being used and no >> DB-memory, >> > > which >> > > looks to me as if all the logic is happening in the java machine. It >> might >> > > be >> > > more usefull to transfer more logic into SQLs to the DB (e.g. use DB >> > > cross-joins >> > > for combining options) as the DB will be more efficient. >> > > - because of the log entries I assume that every single combination is >> > > being >> > > persisted into the DB with a single SQL statement, causing millions of >> > > single >> > > SQL requests. Prefer batch SQL instead of single record processing. >> > > >> > > * during import/export of categoryOptionCombinations: >> > > - prefer batch SQL instead of single record processing >> > > - huge log entries in catalina.out due to several lines of text per >> > > combination >> > > >> > > I'd be very happy about comments. >> > > >> > > Thanks in advance, >> > > >> > > Uwe >> > > >> > > _______________________________________________ >> > > Mailing list: https://launchpad.net/~dhis2-users >> > > Post to : [email protected] <javascript:;> >> > > Unsubscribe : https://launchpad.net/~dhis2-users >> > > More help : https://help.launchpad.net/ListHelp >> > > >> > >> > >> > -- >> > -- >> > Morten Olav Hansen >> > Senior Engineer, DHIS 2 >> > University of Oslo >> > http://www.dhis2.org >> > > > _______________________________________________ > Mailing list: https://launchpad.net/~dhis2-devs > Post to : [email protected] > Unsubscribe : https://launchpad.net/~dhis2-devs > More help : https://help.launchpad.net/ListHelp > > -- Lars Helge Øverland Lead developer, DHIS 2 University of Oslo Skype: larshelgeoverland [email protected] http://www.dhis2.org <https://www.dhis2.org/>
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