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Note: After the amalgamate has run it is no longer possible to create an archive with the exact original data available during the run. In those cases make sure the importAmalgamate workflow schedule and minimalAge are streamlined with the archive runs.

afterAmalgamateImportRunMetaDataExpiryTime

Since 2023.01. By default the import/update run is deleted from the database after amalgamation. It is possible to keep the metadata for a while after amalgamation. This metadata can be still seen in the time series lister as an entry without time series. NB. Only use for workflows that you need to keep, e.g. not for a frequently running SystemMetrics workflow since otherwise the SystemActivities table may grow unexpectedly.

amalgamateOrphans

For systems that did not have an amalgamate module running it maybe required to amalgamate the complete database. This should only be done once or when new workflows are added to the ImportAmalgamate module. It is possible to do this with the amalgamateOrphans=true. As this task may take too long (regular FSS tasks have a time out of 3 hours) this should be handled with care. In that case it may be useful to have the task run at an FSS that has no localDataStore, but has direct access to the central database. Only in that particular case the amalgamate runs (hard coded in the software) only for 1 hour. The task will be aborted after one hour and the remaining imports are not handled in that taskrun anymore. This is done on purpose, as it is now possible to schedule this task with an interval of e.g. 3 hours (making it possible to the MC to do all the required cleaning stuff like rollingBarrel and markedRecordManager). In a few hours (to even days or in some rare situations evens weeks) all the taskruns are handled and the complete database has been amalgamated. Do not forget to stop this scheduled task after the complete database is amalgamated.

Example

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Code Block
xml xml title ModuleInstanceDescriptors.xml
<moduleInstanceDescriptor id="Amalgamate"> <moduleId>ImportAmalgamate</moduleId> </moduleInstanceDescriptor>

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In the module instance configuration the workflowId's can be specified or a workflow pattern can be used when many workflows need to be amalgamated.

Code Block
xml xml title Amalgamate.xml
<?xml version="1.0" encoding="UTF-8"?> <importAmalgamate xmlns="http://www.wldelft.nl/fews" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.wldelft.nl/fews httphttps://fewsfewsdocs.wldelftdeltares.nl/schemas/version1.0/importAmalgamate.xsd"> <workflowId>Import_Data</workflowId> <workflowId>Procesoverzicht_Update</workflowId> <workflowIdPattern>*_Process_Observations</workflowIdPattern> <importRunMinimalAge unit="hour"/> <amalgamateOrphans>false</amalgamateOrphans> </importAmalgamate>

Code Block
xml xml title Amalgamate.xml
<?xml version="1.0" encoding="UTF-8"?> <?xml version="1.0" encoding="UTF-8"?> <importAmalgamate xmlns="http://www.wldelft.nl/fews" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.wldelft.nl/fews http://fews.wldelft.nl/schemas/version1.0/importAmalgamate.xsd"> <workflowId>Import</workflowId> <workflowIdPattern>Import*</workflowIdPattern> <importRunMinimalAge unit="hour"/> <afterAmalgamateImportRunMetaDataExpiryTime multiplier="365" unit="day"/> </importAmalgamate>

Best Practices

The Database Maintenance (ImportAmalgamate) workflow should run frequently (every 12 hours or 1 day) in order to amalgamate the small time series blobs generated in workflows that run with high frequency (5-15 minutes) to larger blobs of 12 hours or 1 day. A second ImportAmalgamate workflow should be scheduled that will run for example every week or every month that amalgamates the already amalgamated workflows in even larger blobs. To do so, schedule a new Database Maintenance workflow with an interval of 30 days that runs an ImportAmalgamate module instance that amalgamates all time series blobs generated in the Database Maintenance workflows. This second ImportAmalgamate step can reduce the number of records in the time series table considerably.  The expiry time of the individual time series is preserved while amalgamated. Therefore it is important to configure an expiry time for the time series sets in the workflows that are amalgamated.  

<?xml version="1.0" encoding="UTF-8"?>
<importAmalgamate xmlns="http://www.wldelft.nl/fews" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.wldelft.nl/fews httphttps://fewsfewsdocs.wldelftdeltares.nl/schemas/version1.0/importAmalgamate.xsd">
  <workflowId>Database_Maintenance</workflowId>
  <importRunMinimalAge unit="day" multiplier="30"/>
  <amalgamateOrphans>false</amalgamateOrphans>
</importAmalgamate>

 What are these steps for? Review whether the below steps for setting up the amalgamate are still relevant with recent versions and whetehr teh troubleshooting steps are still applicable.  

 Steps

1. Identify which external historicals need to be amalgamated.
2. Pick a suitable expiry time T for the taskrun metadata. The taskrun expiry time for amalgamation timeseries should never be set to expire before the timeseries do. By default a TaskRun expires after 10 days and the timeseries become orphaned, but for amalgamation timeseries a much longer expiry time and taskrun expiry time is recommended. It is essential that the taskrun meta data for the "to be amalgamated imported external historical timeseries" does not expire before the amalgamation takes place. When using amalgamate, the taskrun meta data should only be deleted by the amalgamate module.
3. When import runs for external historical timeseries need to run regularly, set up a task and workflow for importing external historical timeseries. The timeseries expiry time is preserved by the amalgamate module and not influenced by the taskrun metadata expiry time. By default the timeseries expiry time is the same as that of the import run, but it is strongly recommended to overrule this by setting an explicit timeseries expiry time in the import module. Use the taskrun metadata expiry time T for the task determined under step @1. Set for instance the expiry time of the task in the Admin Interface to 50 years.
4. Optionally set up an Archive export task and workflow. Obviously this must be before the taskrun metadata expires and before a daily amalgamate has acted on the data.
5. Set up a task and workflow for running a daily amalgamate (after the archive export before taskrun of the import expires). Use the taskrun metadata expiry time T for the task. Set for instance the expiry time of the task in the Admin Interface.
6. When preserving external historical timeseries much longer than a week, setup a separate task and workflow for a weekly amalgamate. This workflow should be setup to process the output of the daily amalgamate. Obviously this workflow must therefore be run before the daily amalgamate taskrun metadata expires. Use the taskrun metadata expiry time T for the task. Set for instance the expiry time of the task in the Admin Interface..
7. When preserving external historical timeseries much longer than a month, setup a separate task and workflow for a monthly amalgamate. This workflow should be setup to process the output of the weekly amalgamate. Obviously this workflow must therefore be run before the weekly amalgamate taskrun metadata expires.

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