[ckan-dev] Harvest cron removal

[David Read]

Cheers Ross,

David

On 30 July 2013 13:37, Ross Thompson <ross.thompson.ca at gmail.com> wrote:
> We (Canada/data.gc.ca) are not using the harvester at the moment, so this
> does not have an impact on us.
>
> Thanks.
>
>
>
> On 30 July 2013 04:56, David Read <david.read at hackneyworkshop.com> wrote:
>>
>> I'm keen to make the CKAN harvester start immediately when you hit the
>> 'refresh source' button. Currently it has to wait for the 'harvester
>> run' cron which is usually configured to occur only every 15 minutes.
>>
>> I get plenty of support calls from organisations who are setting up a
>> harvester, are iterating through problems. They are further frustrated
>> by this curious wait each time. Since the wait time is somewhat
>> 'unknown' it also breeds distrust. And we all hate being made to
>> context-switch away while debugging.
>>
>> From conversations with James, the 15 minute cron was originally
>> designed to ensure that a harvest source couldn't be harvested more
>> than once simultaneously and get confused. Since the harvest job
>> becomes multiple gathers and further split into fetches, James was
>> keen to make sure a source could only have one job for each run of the
>> cron. BUT I'm sure we could get the backend (Redis if not RabbitMQ) to
>> tell us the status of the job (and its related gather/fetches) and
>> stop further ones being created until it is done.
>>
>> Would the various CKAN sites using the harvester (OKF, Frauenhofer,
>> Canada, Washington etc.) be happy about this change? It would be on
>> the CKAN 2.x code.
>>
>> Dave
>>
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