Hello everyone, we are developing a Java-based web-application for managing our adwords accounts, but we ran into some problems lately. Our main goal is to update many adgroups (change status / cpc) in short time, for this reason we use multiple threads, which works fine so far, but seems to have some undocumented drawbacks. When trying to update a loose order of adgroups in multiple threads (e.g. 4 threads updating 10 adgroups each), we run into a "DatabaseError.CONCURRENT_MODIFICATION". It seems this results from having adgroups of the same campaign in different threads (e.g. thread 1 updates adgroup "A" from campaign "X" while thread 2 updates adgroup "B" from campaign "X"). The error doesn't occur if adgroups of the same campaign aren't distributed over the threads. Does it lock down a campaign for concurrent requests if adGroupService.mutate is already running on an adgroup in this campaign?
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